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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 | Jun. 30, 2025 | Dec. 31, 2024 | Jun. 30, 2024
--- | --- | --- | ---
Financial Assets: |  |  |
Interest-bearing deposits with banks | $ 4,569,618 | $ 4,409,753 | $ 2,824,314
Available-for-sale securities | 4,885,715 | 4,141,482 | 4,329,957
Held-to-maturity securities | 2,869,415 | 2,910,550 | 3,060,467
Equity securities with readily determinable fair value | 273,722 | 215,412 | 112,173
FHLB and FRB stock, at cost | 282,087 | 281,407 | 256,495
Brokerage customer receivables | 0 | 18,102 | 13,682
Mortgage loans held-for-sale, at fair value | 299,606 | 331,261 | 411,851
Accrued interest receivable and other | 1,610,025 | 1,739,334 | 1,671,334
Financial Liabilities: |  |  |
FHLB advances | 3,151,309 | 3,151,309 | 3,176,309
Other borrowings | 625,392 | 534,803 | 606,579
Subordinated notes | 298,458 | 298,283 | 298,113
Junior subordinated debentures | 253,566 | 253,566 | 253,566
Carrying Value |  |  |
Financial Assets: |  |  |
Cash and cash equivalents | 695,564 | 458,536 | 415,524
Interest-bearing deposits with banks | 4,569,618 | 4,409,753 | 2,824,314
Available-for-sale securities | 4,885,715 | 4,141,482 | 4,329,957
Held-to-maturity securities | 3,502,186 | 3,613,263 | 3,755,924
Trading account securities | 0 | 4,072 | 4,134
Equity securities with readily determinable fair value | 273,722 | 215,412 | 112,173
FHLB and FRB stock, at cost | 282,087 | 281,407 | 256,495
Brokerage customer receivables | 0 | 18,102 | 13,682
Mortgage loans held-for-sale, at fair value | 299,606 | 331,261 | 411,851
Nonqualified deferred compensation assets | 17,283 | 16,653 | 16,041
Derivative assets | 221,106 | 200,027 | 243,860
Accrued interest receivable and other | 576,813 | 563,625 | 505,504
Total | 66,365,379 | 62,308,630 | 57,564,990
Financial Liabilities: |  |  |
Non-maturity deposits | 45,484,115 | 43,092,318 | 38,778,256
Deposits with stated maturities | 10,332,696 | 9,420,031 | 9,270,770
FHLB advances | 3,151,309 | 3,151,309 | 3,176,309
Other borrowings | 625,392 | 534,803 | 606,579
Subordinated notes | 298,458 | 298,283 | 298,113
Junior subordinated debentures | 253,566 | 253,566 | 253,566
Derivative liabilities | 161,402 | 241,750 | 317,659
Accrued interest payable | 57,470 | 48,364 | 66,373
Total financial liabilities | 60,364,408 | 57,040,424 | 52,767,625
Carrying Value | Loans held-for-investment, at fair value |  |  |
Financial Assets: |  |  |
Loans held-for-investment | 136,884 | 158,795 | 135,834
Carrying Value | Loans held-for-investment, at amortized cost |  |  |
Financial Assets: |  |  |
Loans held-for-investment | 50,904,795 | 47,896,242 | 44,539,697
Fair Value |  |  |
Financial Assets: |  |  |
Cash and cash equivalents | 695,564 | 458,536 | 415,524
Interest-bearing deposits with banks | 4,569,618 | 4,409,753 | 2,824,314
Available-for-sale securities | 4,885,715 | 4,141,482 | 4,329,957
Held-to-maturity securities | 2,869,415 | 2,910,550 | 3,060,467
Trading account securities | 0 | 4,072 | 4,134
Equity securities with readily determinable fair value | 273,722 | 215,412 | 112,173
FHLB and FRB stock, at cost | 282,087 | 281,407 | 256,495
Brokerage customer receivables | 0 | 18,102 | 13,682
Mortgage loans held-for-sale, at fair value | 299,606 | 331,261 | 411,851
Nonqualified deferred compensation assets | 17,283 | 16,653 | 16,041
Derivative assets | 221,106 | 200,027 | 243,860
Accrued interest receivable and other | 576,813 | 563,625 | 505,504
Total | 64,949,164 | 60,779,924 | 55,791,155
Financial Liabilities: |  |  |
Non-maturity deposits | 45,484,115 | 43,092,318 | 38,778,256
Deposits with stated maturities | 10,319,942 | 9,423,976 | 9,248,374
FHLB advances | 3,185,868 | 3,153,524 | 3,195,138
Other borrowings | 625,402 | 534,406 | 605,305
Subordinated notes | 292,668 | 286,683 | 273,666
Junior subordinated debentures | 253,573 | 253,588 | 253,571
Derivative liabilities | 161,402 | 241,750 | 317,659
Accrued interest payable | 57,470 | 48,364 | 66,373
Total financial liabilities | 60,380,440 | 57,034,609 | 52,738,342
Fair Value | Loans held-for-investment, at fair value |  |  |
Financial Assets: |  |  |
Loans held-for-investment | 136,884 | 158,795 | 135,834
Fair Value | Loans held-for-investment, at amortized cost |  |  |
Financial Assets: |  |  |
Loans held-for-investment | $ 50,121,351 | $ 47,070,249 | $ 43,461,319

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