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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
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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

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