v3.25.4
Fair Value Disclosures - Summary of the Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale debt securities $ 3,951,455 $ 3,524,686
Held-to-maturity debt securities 725,722 796,168
Equity securities 41,998 75,261
Trading securities 3,924 0
Derivative assets 40,892 23,202
Long-term debt 620,575 660,346
Derivative liabilities 24,458 57,906
Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 2,099,118 3,188,808
Available-for-sale debt securities 3,951,455 3,524,686
Held-to-maturity debt securities 725,722 796,168
Equity securities 41,998 75,261
Trading securities 3,924  
Loans held for sale 4,361  
Loans held for investment, net 23,769,645 22,178,357
Derivative assets 40,892 23,202
Total deposits 26,448,767 25,238,599
Short-term borrowings 330,000 885,000
Long-term debt 620,575 660,346
Securities sold not yet purchased 12,026 33,705
Derivative liabilities 24,458 57,906
Estimated Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 2,099,118 3,188,808
Available-for-sale debt securities 3,951,455 3,524,686
Held-to-maturity debt securities 654,832 678,174
Equity securities 41,998 75,261
Trading securities 3,924  
Loans held for sale 4,361  
Loans held for investment, net 23,604,206 22,115,585
Derivative assets 40,892 23,202
Total deposits 26,450,932 25,245,009
Short-term borrowings 330,000 885,000
Long-term debt 593,610 622,713
Securities sold not yet purchased 12,026 33,705
Derivative liabilities 24,458 57,906
Level 1 | Estimated Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 2,099,118 3,188,808
Available-for-sale debt securities 0 277,285
Held-to-maturity debt securities 0 0
Equity securities 31,998 59,235
Trading securities 0  
Loans held for sale 0  
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 12,026 33,705
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 3,940,658 3,235,475
Held-to-maturity debt securities 654,832 678,174
Equity securities 10,000 16,026
Trading securities 3,924  
Loans held for sale 4,361  
Loans held for investment, net 0 0
Derivative assets 40,892 23,202
Total deposits 0 0
Short-term borrowings 330,000 885,000
Long-term debt 593,610 622,713
Securities sold not yet purchased 0 0
Derivative liabilities 24,458 57,906
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 10,797 11,926
Held-to-maturity debt securities 0 0
Equity securities 0 0
Trading securities 0  
Loans held for sale 0  
Loans held for investment, net 23,604,206 22,115,585
Derivative assets 0 0
Total deposits 26,450,932 25,245,009
Short-term borrowings 0 0
Long-term debt 0 0
Securities sold not yet purchased 0 0
Derivative liabilities $ 0 $ 0