v3.24.3
Fair Value Disclosures - Summary of the Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale debt securities $ 3,518,662 $ 3,225,892
Held-to-maturity debt securities 812,432 865,477
Equity securities 74,426 51,825
Derivative assets 43,030 32,944
Long-term debt 660,172 859,147
Derivative liabilities 31,675 70,917
Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 4,191,585 3,242,850
Available-for-sale debt securities 3,518,662 3,225,892
Held-to-maturity debt securities 812,432 865,477
Equity securities 74,426 51,825
Loans held for sale 9,022 44,105
Loans held for investment, net 22,021,028 20,090,585
Derivative assets 43,030 32,944
Total deposits 25,865,255 22,371,839
Short-term borrowings 1,035,000 1,500,000
Long-term debt 660,172 859,147
Securities sold not yet purchased 33,244 10,602
Derivative liabilities 31,675 70,917
Estimated Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 4,191,585 3,242,850
Available-for-sale debt securities 3,518,662 3,225,892
Held-to-maturity debt securities 727,743 763,844
Equity securities 74,426 51,825
Loans held for sale 9,022 44,105
Loans held for investment, net 21,978,258 20,050,974
Derivative assets 43,030 32,944
Total deposits 25,873,387 22,379,452
Short-term borrowings 1,035,000 1,500,000
Long-term debt 624,776 801,309
Securities sold not yet purchased 33,244 10,602
Derivative liabilities 31,675 70,917
Level 1 | Estimated Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 4,191,585 3,242,850
Available-for-sale debt securities 275,804 636,473
Held-to-maturity debt securities 0 0
Equity securities 58,140 40,661
Loans held for sale 0 15,000
Loans held for investment, net 0 0
Derivative assets 0 0
Total deposits 0 0
Short-term borrowings 0 0
Long-term debt 0 0
Securities sold not yet purchased 33,244 10,602
Derivative liabilities 0 0
Level 2 | Estimated Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 0 0
Available-for-sale debt securities 3,230,856 2,577,424
Held-to-maturity debt securities 727,743 763,844
Equity securities 16,286 11,164
Loans held for sale 9,022 29,105
Loans held for investment, net 0 0
Derivative assets 43,030 32,944
Total deposits 0 0
Short-term borrowings 1,035,000 1,500,000
Long-term debt 624,776 801,309
Securities sold not yet purchased 0 0
Derivative liabilities 31,675 70,917
Level 3 | Estimated Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 0 0
Available-for-sale debt securities 12,002 11,995
Held-to-maturity debt securities 0 0
Equity securities 0 0
Loans held for sale 0 0
Loans held for investment, net 21,978,258 20,050,974
Derivative assets 0 0
Total deposits 25,873,387 22,379,452
Short-term borrowings 0 0
Long-term debt 0 0
Securities sold not yet purchased 0 0
Derivative liabilities $ 0 $ 0