v3.25.2
Fair Value Disclosures - Summary of the Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale debt securities $ 3,774,141 $ 3,524,686
Held-to-maturity debt securities 761,907 796,168
Equity securities 68,692 75,261
Trading securities 3,888 0
Derivative assets 50,129 23,202
Long-term debt 620,256 660,346
Derivative liabilities 40,217 57,906
Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 2,690,142 3,188,808
Available-for-sale debt securities 3,774,141 3,524,686
Held-to-maturity debt securities 761,907 796,168
Equity securities 68,692 75,261
Trading securities 3,888  
Loans held for investment, net 23,647,886 22,178,357
Derivative assets 50,129 23,202
Total deposits 26,064,309 25,238,599
Short-term borrowings 1,250,000 885,000
Long-term debt 620,256 660,346
Securities sold not yet purchased 26,551 33,705
Derivative liabilities 40,217 57,906
Estimated Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 2,690,142 3,188,808
Available-for-sale debt securities 3,774,141 3,524,686
Held-to-maturity debt securities 674,663 678,174
Equity securities 68,692 75,261
Trading securities 3,888  
Loans held for investment, net 23,597,536 22,115,585
Derivative assets 50,129 23,202
Total deposits 26,065,518 25,245,009
Short-term borrowings 1,250,000 885,000
Long-term debt 590,131 622,713
Securities sold not yet purchased 26,551 33,705
Derivative liabilities 40,217 57,906
Level 1 | Estimated Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 2,690,142 3,188,808
Available-for-sale debt securities 0 277,285
Held-to-maturity debt securities 0 0
Equity securities 52,561 59,235
Trading securities 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 26,551 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 3,762,774 3,235,475
Held-to-maturity debt securities 674,663 678,174
Equity securities 16,131 16,026
Trading securities 3,888  
Loans held for investment, net 0 0
Derivative assets 50,129 23,202
Total deposits 0 0
Short-term borrowings 1,250,000 885,000
Long-term debt 590,131 622,713
Securities sold not yet purchased 0 0
Derivative liabilities 40,217 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 11,367 11,926
Held-to-maturity debt securities 0 0
Equity securities 0 0
Trading securities 0  
Loans held for investment, net 23,597,536 22,115,585
Derivative assets 0 0
Total deposits 26,065,518 25,245,009
Short-term borrowings 0 0
Long-term debt 0 0
Securities sold not yet purchased 0 0
Derivative liabilities $ 0 $ 0