v3.26.1
Allowance for Credit Losses - Schedule of Held-to-Maturity Debt Securities by Credit Quality Indicator (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Jun. 30, 2025
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]      
Amortized Cost $ 3,196,672 $ 3,344,165 $ 3,502,584
Less: Allowance for credit losses (220) (260) (398)
Held-to-maturity securities, net of allowance for credit losses 3,196,452 3,343,905 3,502,186
U.S. government agencies      
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]      
2026 0    
2025 0    
2024 0    
2023 0    
2022 135,000    
Prior 178,542    
Amortized Cost 313,542 313,541 313,540
U.S. government agencies | 1-4 internal grade      
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]      
2026 0    
2025 0    
2024 0    
2023 0    
2022 135,000    
Prior 178,542    
Amortized Cost 313,542    
U.S. government agencies | 5-7 internal grade      
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]      
2026 0    
2025 0    
2024 0    
2023 0    
2022 0    
Prior 0    
Amortized Cost 0    
U.S. government agencies | 8-10 internal grade      
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]      
2026 0    
2025 0    
2024 0    
2023 0    
2022 0    
Prior 0    
Amortized Cost 0    
Municipal      
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]      
2026 0    
2025 0    
2024 0    
2023 3,912    
2022 1,024    
Prior 129,298    
Amortized Cost 134,234 $ 144,192 $ 156,753
Municipal | 1-4 internal grade      
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]      
2026 0    
2025 0    
2024 0    
2023 3,912    
2022 1,024    
Prior 127,411    
Amortized Cost 132,347    
Municipal | 5-7 internal grade      
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]      
2026 0    
2025 0    
2024 0    
2023 0    
2022 0    
Prior 1,887    
Amortized Cost 1,887    
Municipal | 8-10 internal grade      
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]      
2026 0    
2025 0    
2024 0    
2023 0    
2022 0    
Prior 0    
Amortized Cost 0    
Mortgage-backed securities      
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]      
2026 0    
2025 0    
2024 0    
2023 231,861    
2022 451,515    
Prior 2,039,538    
Amortized Cost 2,722,914    
Mortgage-backed securities | 1-4 internal grade      
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]      
2026 0    
2025 0    
2024 0    
2023 231,861    
2022 451,515    
Prior 2,039,538    
Amortized Cost 2,722,914    
Mortgage-backed securities | 5-7 internal grade      
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]      
2026 0    
2025 0    
2024 0    
2023 0    
2022 0    
Prior 0    
Amortized Cost 0    
Mortgage-backed securities | 8-10 internal grade      
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]      
2026 0    
2025 0    
2024 0    
2023 0    
2022 0    
Prior 0    
Amortized Cost 0    
Corporate notes      
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]      
2026 0    
2025 0    
2024 0    
2023 0    
2022 4,975    
Prior 21,007    
Amortized Cost 25,982    
Corporate notes | 1-4 internal grade      
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]      
2026 0    
2025 0    
2024 0    
2023 0    
2022 4,975    
Prior 21,007    
Amortized Cost 25,982    
Corporate notes | 5-7 internal grade      
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]      
2026 0    
2025 0    
2024 0    
2023 0    
2022 0    
Prior 0    
Amortized Cost 0    
Corporate notes | 8-10 internal grade      
Debt Securities, Held-to-maturity, Credit Quality Indicator [Line Items]      
2026 0    
2025 0    
2024 0    
2023 0    
2022 0    
Prior 0    
Amortized Cost $ 0