Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Operating Activities:
Net income	$ 485,765	$ 397,956
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	124,000	104,500
Deferred income tax expense	19,669	7,908
Stock-based compensation	29,132	27,193
Depreciation and amortization of property and equipment and intangible assets	36,327	36,510
Net (accretion) and amortization of interest-earning assets and borrowings	(80,485)	(32,845)
Amortization of low-income housing tax credit investments	66,672	42,249
Reduction of ROU lease assets	15,520	16,522
Net (gain) loss on sale of investment securities	(220)	59,741
Originations of loans held for sale	(4,781)	(31,259)
Proceeds from sale of loans held for sale	5,025	5,770
Net (gain) on sale of mortgage servicing rights	0	(11,655)
(Increase) in cash surrender value of life insurance policies	(17,164)	(12,305)
(Gain) from life insurance policies	(1,492)	(8,560)
(Gain) on sale of alternative investments	(5,748)	0
Other operating activities, net	(2,927)	(10,061)
Net (increase) decrease in derivative contract assets and liabilities	(147,889)	39,768
Net (increase) decrease in prepaid expenses and other assets	(76,566)	241,426
Net (decrease) in accrued expenses and other liabilities	(79,034)	(405,186)
Net cash provided by operating activities	365,804	467,672
Investing Activities:
Purchases of available-for-sale securities	(1,017,967)	(654,675)
Proceeds from principal payments, maturities, and calls of available-for-sale securities	564,454	425,929
Proceeds from sale of available-for-sale securities	14,880	1,253,332
Purchases of held-to-maturity securities	0	(1,732,829)
Proceeds from principal payments, maturities, and calls of held-to-maturity securities	283,335	189,273
Net (increase) in Federal Home Loan Bank and Federal Reserve Bank stock	(48,929)	(21,381)
Alternative investments (capital calls), net of returns of capital	(141,398)	(8,533)
Proceeds from sales of alternative investments	9,536	0
Net (increase) in loans	(1,561,321)	(1,223,546)
Proceeds from sale of loans not originated for sale	80,938	92,664
Proceeds from sale of mortgage servicing rights	0	18,310
Proceeds from sale of foreclosed properties and repossessed assets	261	1,490
Proceeds from sale of property and equipment	2,323	3,820
Purchases of property and equipment	(21,533)	(13,483)
Proceeds from life insurance policies	8,591	12,541
Net cash paid for acquisition of Ametros	0	(359,460)
Net cash (used for) investing activities	(1,826,830)	(2,016,548)
Financing Activities:
Net increase in deposits	1,559,263	1,502,372
Net increase in Federal Home Loan Bank advances	1,229,806	449,825
Net increase (decrease) in securities sold under agreements to repurchase and federal funds purchased	28,638	(218,863)
Repayment of long-term debt	0	(132,550)
Payment of contingent consideration	(11,241)	(4,050)
Dividends paid to common stockholders	(135,839)	(137,654)
Dividends paid to preferred stockholders	(8,325)	(8,325)
Common stock repurchase program	(259,601)	(65,402)
Common shares acquired related to stock compensation plan activity	(22,190)	(16,619)
Net cash provided by financing activities	2,380,511	1,368,734
Net increase (decrease) in cash and cash equivalents	919,485	(180,142)
Cash and cash equivalents, beginning of period	2,074,434	1,715,795
Cash and cash equivalents, end of period	$ 2,993,919	$ 1,535,653