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Fair Values of Assets and Liabilities - Schedule of Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Financial Assets:    
Interest-bearing deposits with banks $ 3,180,553 $ 4,409,753
Available-for-sale securities 6,236,263 4,141,482
Held-to-maturity securities 2,785,147 2,910,550
Equity securities with readily determinable fair value 63,770 215,412
FHLB and FRB stock, at cost 291,881 281,407
Brokerage customer receivables 0 18,102
Mortgage loans held-for-sale, at fair value 340,745 331,261
Accrued interest receivable and other assets 1,617,682 1,739,334
Financial Liabilities:    
Federal Home Loan Bank advances 3,451,309 3,151,309
Other borrowings 477,966 534,803
Subordinated notes 298,636 298,283
Junior subordinated debentures 253,566 253,566
Carrying Value    
Financial Assets:    
Cash and cash equivalents 467,938 458,536
Interest-bearing deposits with banks 3,180,553 4,409,753
Available-for-sale securities 6,236,263 4,141,482
Held-to-maturity securities 3,343,905 3,613,263
Trading account securities 0 4,072
Equity securities with readily determinable fair value 63,770 215,412
FHLB and FRB stock, at cost 291,881 281,407
Brokerage customer receivables 0 18,102
Mortgage loans held-for-sale, at fair value 340,745 331,261
Nonqualified deferred compensation assets 18,112 16,653
Derivative assets 179,667 200,027
Accrued interest receivable and other assets 552,197 563,625
Total financial assets 67,780,132 62,308,630
Financial Liabilities:    
Non-maturity deposits 47,839,241 43,092,318
Deposits with stated maturities 9,877,950 9,420,031
Federal Home Loan Bank advances 3,451,309 3,151,309
Other borrowings 477,966 534,803
Subordinated notes 298,636 298,283
Junior subordinated debentures 253,566 253,566
Derivative liabilities 123,774 241,750
Accrued interest payable 62,884 48,364
Total financial liabilities 62,385,326 57,040,424
Carrying Value | Loans held-for-investment, at fair value    
Financial Assets:    
Loans held-for-investment 151,590 158,795
Carrying Value | Loans held-for-investment, at amortized cost    
Financial Assets:    
Loans held-for-investment 52,953,511 47,896,242
Fair Value    
Financial Assets:    
Cash and cash equivalents 467,938 458,536
Interest-bearing deposits with banks 3,180,553 4,409,753
Available-for-sale securities 6,236,263 4,141,482
Held-to-maturity securities 2,785,147 2,910,550
Trading account securities 0 4,072
Equity securities with readily determinable fair value 63,770 215,412
FHLB and FRB stock, at cost 291,881 281,407
Brokerage customer receivables 0 18,102
Mortgage loans held-for-sale, at fair value 340,745 331,261
Nonqualified deferred compensation assets 18,112 16,653
Derivative assets 179,667 200,027
Accrued interest receivable and other assets 552,197 563,625
Total financial assets 66,651,364 60,779,924
Financial Liabilities:    
Non-maturity deposits 47,839,241 43,092,318
Deposits with stated maturities 9,890,485 9,423,976
Federal Home Loan Bank advances 3,472,538 3,153,524
Other borrowings 478,072 534,406
Subordinated notes 296,487 286,683
Junior subordinated debentures 253,591 253,588
Derivative liabilities 123,774 241,750
Accrued interest payable 62,884 48,364
Total financial liabilities 62,417,072 57,034,609
Fair Value | Loans held-for-investment, at fair value    
Financial Assets:    
Loans held-for-investment 151,590 158,795
Fair Value | Loans held-for-investment, at amortized cost    
Financial Assets:    
Loans held-for-investment $ 52,383,501 $ 47,070,249