v3.26.1
Fair Value Disclosures - Summary of the Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Available-for-sale debt securities $ 3,826,284 $ 3,951,455
Held-to-maturity debt securities 692,332 725,722
Equity securities 43,429 41,998
Trading debt securities 2,539 3,924
Derivative assets 15,322 40,892
Long-term debt 500,859 620,575
Derivative liabilities 42,470 24,458
Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 3,698,268 2,099,118
Available-for-sale debt securities 3,826,284 3,951,455
Held-to-maturity debt securities 692,332 725,722
Equity securities 43,429 41,998
Trading debt securities 2,539 3,924
Loans held for sale   4,361
Loans held for investment, net 24,678,958 23,769,645
Derivative assets 15,322 40,892
Other trading assets 56  
Total deposits 28,911,388 26,448,767
Short-term borrowings 350,000 330,000
Long-term debt 500,859 620,575
Securities sold not yet purchased 11,646 12,026
Derivative liabilities 42,470 24,458
Estimated Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 3,698,268 2,099,118
Available-for-sale debt securities 3,826,284 3,951,455
Held-to-maturity debt securities 616,820 654,832
Equity securities 43,429 41,998
Trading debt securities 2,539 3,924
Loans held for sale   4,361
Loans held for investment, net 24,398,152 23,604,206
Derivative assets 15,322 40,892
Other trading assets 56  
Total deposits 29,604,026 26,450,932
Short-term borrowings 350,000 330,000
Long-term debt 507,435 593,610
Securities sold not yet purchased 11,646 12,026
Derivative liabilities 42,470 24,458
Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Equity securities 33,429 31,998
Trading debt securities 0 0
Loans held for investment, net 0 0
Derivative assets 0 0
Other trading assets 56  
Securities sold not yet purchased 11,646 12,026
Derivative liabilities 0 0
Level 1 | Estimated Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and cash equivalents 3,698,268 2,099,118
Available-for-sale debt securities 0 0
Held-to-maturity debt securities 0 0
Equity securities 33,429 31,998
Trading debt securities 0 0
Loans held for sale  
Loans held for investment, net 0 0
Derivative assets 0 0
Other trading assets 56  
Total deposits 0 0
Short-term borrowings 0 0
Long-term debt 0 0
Securities sold not yet purchased 11,646 12,026
Derivative liabilities 0 0
Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Equity securities 10,000 10,000
Trading debt securities 2,539 3,924
Loans held for investment, net 0 0
Derivative assets 15,322 40,892
Other trading assets 0  
Securities sold not yet purchased 0 0
Derivative liabilities 42,470 24,458
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 3,816,003 3,940,658
Held-to-maturity debt securities 616,820 654,832
Equity securities 10,000 10,000
Trading debt securities 2,539 3,924
Loans held for sale   4,361
Loans held for investment, net 0 0
Derivative assets 15,322 40,892
Other trading assets 0  
Total deposits 0 0
Short-term borrowings 350,000 330,000
Long-term debt 507,435 593,610
Securities sold not yet purchased 0 0
Derivative liabilities 42,470 24,458
Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Equity securities 0 0
Trading debt securities 0 0
Loans held for investment, net 25,816 20,844
Derivative assets 0 0
Other trading assets 0  
Securities sold not yet purchased 0 0
Derivative liabilities 0 0
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 10,281 10,797
Held-to-maturity debt securities 0 0
Equity securities 0 0
Trading debt securities 0 0
Loans held for sale  
Loans held for investment, net 24,398,152 23,604,206
Derivative assets 0 0
Other trading assets 0  
Total deposits 29,604,026 26,450,932
Short-term borrowings 0 0
Long-term debt 0 0
Securities sold not yet purchased 0 0
Derivative liabilities $ 0 $ 0