v3.26.1
Fair Value of Assets and Liabilities - Schedule of Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Mar. 31, 2025
Financial Assets:      
Interest-bearing deposits with banks $ 3,051,665 $ 3,180,553 $ 4,238,237
Available-for-sale securities 7,244,282 6,236,263 4,220,305
Held-to-maturity securities 2,702,780 2,785,147 2,922,813
Equity securities with readily determinable fair value 63,786 63,770 270,442
FHLB and FRB stock, at cost 292,044 291,881 281,893
Mortgage loans held-for-sale, at fair value 383,405 340,745 316,804
Accrued interest receivable and other 1,596,617 1,617,682 1,598,255
Financial Liabilities:      
FHLB advances 3,451,309 3,451,309 3,151,309
Other borrowings 340,647 477,966 529,269
Subordinated notes 298,717 298,636 298,360
Junior subordinated debentures 253,566 253,566 253,566
Carrying Value      
Financial Assets:      
Cash and cash equivalents 543,719 467,938 616,279
Interest-bearing deposits with banks 3,051,665 3,180,553 4,238,237
Available-for-sale securities 7,244,282 6,236,263 4,220,305
Held-to-maturity securities 3,270,207 3,343,905 3,564,490
Equity securities with readily determinable fair value 63,786 63,770 270,442
FHLB and FRB stock, at cost 292,044 291,881 281,893
Mortgage loans held-for-sale, at fair value 383,405 340,745 316,804
Nonqualified deferred compensation assets 17,630 18,112 16,396
Derivative assets 152,851 179,667 204,257
Accrued interest receivable and other 570,211 552,197 573,254
Total 69,661,092 67,780,132 63,010,747
Financial Liabilities:      
Non-maturity deposits 48,427,601 47,839,241 43,601,801
Deposits with stated maturities 10,486,781 9,877,950 9,968,237
FHLB advances 3,451,309 3,451,309 3,151,309
Other borrowings 340,647 477,966 529,269
Subordinated notes 298,717 298,636 298,360
Junior subordinated debentures 253,566 253,566 253,566
Derivative liabilities 118,937 123,774 181,198
Accrued interest payable 59,561 62,884 60,127
Total financial liabilities 63,437,119 62,385,326 58,043,867
Carrying Value | Loans held-for-investment, at fair value      
Financial Assets:      
Loans held-for-investment 150,470 151,590 126,521
Carrying Value | Loans held-for-investment, at amortized cost      
Financial Assets:      
Loans held-for-investment 53,920,822 52,953,511 48,581,869
Fair Value      
Financial Assets:      
Cash and cash equivalents 543,719 467,938 616,279
Interest-bearing deposits with banks 3,051,665 3,180,553 4,238,237
Available-for-sale securities 7,244,282 6,236,263 4,220,305
Held-to-maturity securities 2,702,780 2,785,147 2,922,813
Equity securities with readily determinable fair value 63,786 63,770 270,442
FHLB and FRB stock, at cost 292,044 291,881 281,893
Mortgage loans held-for-sale, at fair value 383,405 340,745 316,804
Nonqualified deferred compensation assets 17,630 18,112 16,396
Derivative assets 152,851 179,667 204,257
Accrued interest receivable and other 570,211 552,197 573,254
Total 68,570,481 66,651,364 61,531,858
Financial Liabilities:      
Non-maturity deposits 48,427,601 47,839,241 43,601,801
Deposits with stated maturities 10,485,678 9,890,485 9,964,441
FHLB advances 3,471,892 3,472,538 3,164,174
Other borrowings 340,647 478,072 529,297
Subordinated notes 294,351 296,487 294,495
Junior subordinated debentures 253,568 253,591 253,571
Derivative liabilities 118,937 123,774 181,198
Accrued interest payable 59,561 62,884 60,127
Total financial liabilities 63,452,235 62,417,072 58,049,104
Fair Value | Loans held-for-investment, at fair value      
Financial Assets:      
Loans held-for-investment 150,470 151,590 126,521
Fair Value | Loans held-for-investment, at amortized cost      
Financial Assets:      
Loans held-for-investment $ 53,397,638 $ 52,383,501 $ 47,744,657