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CONSOLIDATED STATEMENTS OF CASH FLOWS - UNAUDITED - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Cash flows from operating activities:    
Net income $ 204,708 $ 199,093
Adjustments to reconcile net income to net cash provided by operating activities:    
Amortization and accretion, net (14,916) (14,696)
Provision for credit losses 49,097 42,386
Gain (loss) on investment securities, net (1,926) (1,940)
Share based compensation 16,829 14,912
Depreciation and amortization 31,474 39,903
Deferred income taxes (1,011) 780
Proceeds from sale of loans held for sale, net 41,347 105,154
Daily cash settlement of derivative instruments, net 1,169 (16,760)
Other:    
Decrease (increase) in other assets 15,748 (103,898)
Increase (decrease) in other liabilities 55,282 (31,216)
Net cash provided by operating activities 397,801 233,718
Cash flows from investing activities:    
Purchases of investment securities (3,440,300) (2,529,834)
Proceeds from repayments and calls of investment securities 1,177,406 1,551,710
Proceeds from sale of investment securities 2,404,795 872,214
Purchases of non-marketable equity securities (413,539) (212,563)
Proceeds from redemption of non-marketable equity securities 395,557 252,938
Purchases of loans (306,367) (247,412)
Loan originations and repayments, net 651,992 655,277
Proceeds from sale of loans 37,650 47,357
Disposition of operating lease equipment 25,338 3,148
Other investing activities, net (44,070) (54,406)
Net cash provided by investing activities 488,462 338,429
Cash flows from financing activities:    
Net (decrease) increase in deposits (1,040,522) 752,584
Net increase in federal funds purchased 229,993 0
Additions to FHLB borrowings 525,000 135,000
Repayments of FHLB borrowings (155,000) (985,000)
Redemption of senior notes 0 (388,479)
Dividends paid (72,000) (68,621)
Repurchase of common stock (208,593) 0
Other financing activities 42,255 50,758
Net cash used in financing activities (678,867) (503,758)
Net increase in cash and cash equivalents 207,396 68,389
Cash and cash equivalents, beginning of period 217,784 491,116
Cash and cash equivalents, end of period 425,180 559,505
Supplemental disclosure of cash flow information:    
Interest paid 551,847 636,065
Income taxes paid, net 56,431 129,972
Supplemental schedule of non-cash investing and financing activities:    
Transfers from loans to loans held for sale 78,656 154,225
Transfers from equipment held for sale to operating lease equipment 9,593 0
Dividends declared, not paid 22,996 23,282
Unsettled securities purchases 14,451 159,625
Unsettled securities sales 45,860 0
ROU assets obtained in exchange for lease liabilities $ 19,263 $ 7,791