v3.26.1
Fair Value of Assets and Liabilities - Schedule of Carrying Amounts and Estimated Fair Values of Financial Instruments (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Dec. 31, 2025
Jun. 30, 2025
Financial Assets:      
Interest-bearing deposits with banks $ 3,573,915 $ 3,180,553 $ 4,569,618
Available-for-sale securities 7,587,545 6,236,263 4,885,715
Held-to-maturity securities 2,634,961 2,785,147 2,869,415
Equity securities with readily determinable fair value 65,815 63,770 273,722
FHLB and FRB stock, at cost 294,629 291,881 282,087
Mortgage loans held-for-sale, at fair value 407,495 340,745 299,606
Accrued interest receivable and other 1,666,474 1,617,682 1,610,025
Financial Liabilities:      
FHLB advances 3,450,680 3,451,309 3,151,309
Other borrowings 370,736 477,966 625,392
Subordinated notes 298,820 298,636 298,458
Junior subordinated debentures 253,566 253,566 253,566
Carrying Value      
Financial Assets:      
Cash and cash equivalents 595,855 467,938 695,564
Interest-bearing deposits with banks 3,573,915 3,180,553 4,569,618
Available-for-sale securities 7,587,545 6,236,263 4,885,715
Held-to-maturity securities 3,196,452 3,343,905 3,502,186
Equity securities with readily determinable fair value 65,815 63,770 273,722
FHLB and FRB stock, at cost 294,629 291,881 282,087
Mortgage loans held-for-sale, at fair value 407,495 340,745 299,606
Nonqualified deferred compensation assets 19,043 18,112 17,283
Derivative assets 129,736 179,667 221,106
Accrued interest receivable and other 579,494 552,197 576,813
Total 72,104,926 67,780,132 66,365,379
Financial Liabilities:      
Non-maturity deposits 49,569,695 47,839,241 45,484,115
Deposits with stated maturities 11,571,580 9,877,950 10,332,696
FHLB advances 3,450,680 3,451,309 3,151,309
Other borrowings 370,736 477,966 625,392
Subordinated notes 298,820 298,636 298,458
Junior subordinated debentures 253,566 253,566 253,566
Derivative liabilities 140,111 123,774 161,402
Accrued interest payable 53,561 62,884 57,470
Total financial liabilities 65,708,749 62,385,326 60,364,408
Carrying Value | Loans held-for-investment, at fair value      
Financial Assets:      
Loans held-for-investment 137,673 151,590 136,884
Carrying Value | Loans held-for-investment, at amortized cost      
Financial Assets:      
Loans held-for-investment 55,517,274 52,953,511 50,904,795
Fair Value      
Financial Assets:      
Cash and cash equivalents 595,855 467,938 695,564
Interest-bearing deposits with banks 3,573,915 3,180,553 4,569,618
Available-for-sale securities 7,587,545 6,236,263 4,885,715
Held-to-maturity securities 2,634,961 2,785,147 2,869,415
Equity securities with readily determinable fair value 65,815 63,770 273,722
FHLB and FRB stock, at cost 294,629 291,881 282,087
Mortgage loans held-for-sale, at fair value 407,495 340,745 299,606
Nonqualified deferred compensation assets 19,043 18,112 17,283
Derivative assets 129,736 179,667 221,106
Accrued interest receivable and other 579,494 552,197 576,813
Total 70,819,089 66,651,364 64,949,164
Financial Liabilities:      
Non-maturity deposits 49,569,695 47,839,241 45,484,115
Deposits with stated maturities 11,562,542 9,890,485 10,319,942
FHLB advances 3,452,714 3,472,538 3,185,868
Other borrowings 370,736 478,072 625,402
Subordinated notes 298,923 296,487 292,668
Junior subordinated debentures 253,548 253,591 253,573
Derivative liabilities 140,111 123,774 161,402
Accrued interest payable 53,561 62,884 57,470
Total financial liabilities 65,701,830 62,417,072 60,380,440
Fair Value | Loans held-for-investment, at fair value      
Financial Assets:      
Loans held-for-investment 137,673 151,590 136,884
Fair Value | Loans held-for-investment, at amortized cost      
Financial Assets:      
Loans held-for-investment $ 54,792,928 $ 52,383,501 $ 50,121,351