v3.26.1
Fair Value of Assets and Liabilities - Schedule of Valuation Techniques and Significant Unobservable Inputs Used to Measure Both Recurring and Non Recurring (Details)
Jun. 30, 2026
USD ($)
$ / shares
year
Mar. 31, 2026
USD ($)
Dec. 31, 2025
USD ($)
Jun. 30, 2025
USD ($)
Mar. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Available-for-sale securities $ 7,587,545,000   $ 6,236,263,000 $ 4,885,715,000    
Loans held-for-investment 137,673,000     136,884,000    
MSRs 201,903,000 $ 195,276,000 195,023,000 193,061,000 $ 196,307,000 $ 203,788,000
Individually assessed loans - foreclosure probable and collateral-dependent 134,955,000     143,486,000    
Municipal securities            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Available-for-sale securities 171,148,000   162,166,000 180,644,000    
Measured at fair value on a recurring basis:            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Mortgage loans held-for-sale 407,495,000   340,745,000 299,606,000    
Loans held-for-investment 137,673,000   151,590,000 136,884,000    
MSRs 201,903,000   195,023,000 193,061,000    
Derivative assets 129,736,000   179,667,000 221,106,000    
Measured at fair value on a recurring basis: | Municipal securities            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Available-for-sale securities 171,148,000   162,166,000 180,644,000    
Measured at fair value on a non-recurring basis:            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Individually assessed loans - foreclosure probable and collateral-dependent 134,955,000          
Other real estate owned 15,940,000          
Level 3            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Individually assessed loans - foreclosure probable and collateral-dependent 135,000,000.0          
Level 3 | Measured at fair value on a recurring basis:            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Mortgage loans held-for-sale 47,589,000   53,814,000 27,168,000    
Loans held-for-investment 56,001,000   56,200,000 53,037,000    
MSRs 201,903,000   195,023,000 193,061,000    
Derivative assets $ 5,103,000   3,416,000 5,548,000    
Level 3 | Measured at fair value on a recurring basis: | Discount rate | Discounted cash flows            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Mortgage loans held-for-sale, measurement input 0.0528          
Level 3 | Measured at fair value on a recurring basis: | Discount rate | Discounted cash flows | Minimum            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Loans held-for-investment, measurement input 0.0528          
MSRs, measurement input 0.0850          
Level 3 | Measured at fair value on a recurring basis: | Discount rate | Discounted cash flows | Maximum            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Loans held-for-investment, measurement input 0.0600          
MSRs, measurement input 0.1200          
Level 3 | Measured at fair value on a recurring basis: | Discount rate | Discounted cash flows | Weighted Average            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Mortgage loans held-for-sale, measurement input 0.0528          
Loans held-for-investment, measurement input 0.0536          
MSRs, measurement input 0.0983          
Level 3 | Measured at fair value on a recurring basis: | Credit discount | Discounted cash flows | Minimum            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Mortgage loans held-for-sale, measurement input 0.0000          
Loans held-for-investment, measurement input 0.0000          
Level 3 | Measured at fair value on a recurring basis: | Credit discount | Discounted cash flows | Maximum            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Mortgage loans held-for-sale, measurement input 0.2875          
Loans held-for-investment, measurement input 0.3606          
Level 3 | Measured at fair value on a recurring basis: | Credit discount | Discounted cash flows | Weighted Average            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Mortgage loans held-for-sale, measurement input 0.0074          
Loans held-for-investment, measurement input 0.0164          
Level 3 | Measured at fair value on a recurring basis: | Constant prepayment rate (CPR) - current loans | Discounted cash flows            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Loans held-for-investment, measurement input 0.1032          
Level 3 | Measured at fair value on a recurring basis: | Constant prepayment rate (CPR) - current loans | Discounted cash flows | Minimum            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
MSRs, measurement input 0.0584          
Level 3 | Measured at fair value on a recurring basis: | Constant prepayment rate (CPR) - current loans | Discounted cash flows | Maximum            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
MSRs, measurement input 0.8374          
Level 3 | Measured at fair value on a recurring basis: | Constant prepayment rate (CPR) - current loans | Discounted cash flows | Weighted Average            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Loans held-for-investment, measurement input 0.1032          
MSRs, measurement input 0.1032          
Level 3 | Measured at fair value on a recurring basis: | Average life - delinquent loans (in years) | Discounted cash flows | Minimum            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Loans held-for-investment, measurement input | year 1.4          
Level 3 | Measured at fair value on a recurring basis: | Average life - delinquent loans (in years) | Discounted cash flows | Maximum            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Loans held-for-investment, measurement input | year 12          
Level 3 | Measured at fair value on a recurring basis: | Average life - delinquent loans (in years) | Discounted cash flows | Weighted Average            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Loans held-for-investment, measurement input | year 5.4          
Level 3 | Measured at fair value on a recurring basis: | Cost of servicing | Discounted cash flows | Minimum            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
MSRs, measurement input | $ / shares 70          
Level 3 | Measured at fair value on a recurring basis: | Cost of servicing | Discounted cash flows | Maximum            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
MSRs, measurement input | $ / shares 90          
Level 3 | Measured at fair value on a recurring basis: | Cost of servicing | Discounted cash flows | Weighted Average            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
MSRs, measurement input 76          
Level 3 | Measured at fair value on a recurring basis: | Cost of servicing - delinquent | Discounted cash flows | Minimum            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
MSRs, measurement input | $ / shares 200          
Level 3 | Measured at fair value on a recurring basis: | Cost of servicing - delinquent | Discounted cash flows | Maximum            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
MSRs, measurement input | $ / shares 1,000          
Level 3 | Measured at fair value on a recurring basis: | Cost of servicing - delinquent | Discounted cash flows | Weighted Average            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
MSRs, measurement input 371          
Level 3 | Measured at fair value on a recurring basis: | Pull-through rate | Discounted cash flows | Minimum            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Derivatives, measurement input 0.1852          
Level 3 | Measured at fair value on a recurring basis: | Pull-through rate | Discounted cash flows | Maximum            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Derivatives, measurement input 1          
Level 3 | Measured at fair value on a recurring basis: | Pull-through rate | Discounted cash flows | Weighted Average            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Derivatives, measurement input 0.8714          
Level 3 | Measured at fair value on a recurring basis: | Municipal securities            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Available-for-sale securities $ 123,703,000   $ 99,603,000 $ 116,075,000    
Level 3 | Measured at fair value on a non-recurring basis:            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Individually assessed loans - foreclosure probable and collateral-dependent 134,955,000          
Other real estate owned $ 15,940,000          
Level 3 | Measured at fair value on a non-recurring basis: | Appraisal adjustment - cost of sale | Appraisal value            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Impaired loans - collateral based, measurement input 0.1000          
Other real estate owned, measurement input 0.1000          
Level 3 | Measured at fair value on a non-recurring basis: | Appraisal adjustment - cost of sale | Appraisal value | Weighted Average            
Fair Value Measurement Inputs and Valuation Techniques [Line Items]            
Impaired loans - collateral based, measurement input 0.1000          
Other real estate owned, measurement input 0.1000