Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Operating Activities:
Net income	$ 226,917	$ 216,323
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	77,500	45,500
Deferred income tax expense	27,636	16,470
Stock-based compensation	14,011	13,760
Depreciation and amortization of property and equipment and intangible assets	18,239	19,027
Net (accretion) amortization of interest-earning assets and borrowings	(41,132)	(11,893)
Amortization of low-income housing tax credit investments	32,061	20,413
Reduction of ROU lease assets	7,614	7,475
Net (gain) loss on sale of investment securities	(220)	9,826
Originations of loans held for sale	(3,105)	(3,317)
Proceeds from sale of loans held for sale	2,741	4,713
Net (gain) on sale of mortgage servicing rights	0	(11,655)
(Increase) in cash surrender value of life insurance policies	(7,992)	(5,946)
(Gain) from life insurance policies	(821)	(6,888)
(Gain) on sale of alternative investments	(3,291)	0
Other operating activities, net	(499)	(4,257)
Net (increase) decrease in derivative contract assets and liabilities	(84,526)	56,534
Net (increase) decrease in prepaid expenses and other assets	(14,062)	296,416
Net (decrease) in accrued expenses and other liabilities	(156,181)	(418,820)
Net cash provided by operating activities	94,890	243,681
Investing Activities:
Purchases of available-for-sale securities	(552,655)	(244,434)
Proceeds from principal payments, maturities, and calls of available-for-sale securities	331,818	205,507
Proceeds from sale of available-for-sale securities	14,880	331,690
Purchases of held-to-maturity securities	0	(677,961)
Proceeds from principal payments, maturities, and calls of held-to-maturity securities	162,036	80,360
Net (increase) in Federal Home Loan Bank and Federal Reserve Bank stock	(29,359)	(54,569)
Alternative investments (capital calls), net of returns of capital	(56,677)	(4,192)
Proceeds from sales of alternative investments	4,970	0
Net (increase) in loans	(653,556)	(692,991)
Proceeds from sale of loans not originated for sale	38,877	49,440
Proceeds from sale of mortgage servicing rights	0	18,310
Proceeds from sale of foreclosed properties and repossessed assets	181	790
Proceeds from sale of property and equipment	1,428	1,042
Purchases of property and equipment	(8,311)	(5,057)
Proceeds from life insurance policies	8,004	3,977
Net cash paid for acquisition of Ametros	0	(359,460)
Net cash (used for) investing activities	(738,364)	(1,347,548)
Financing Activities:
Net increase (decrease) in deposits	817,663	(26,850)
Net increase in Federal Home Loan Bank advances	799,903	1,299,912
Net (decrease) in securities sold under agreements to repurchase and federal funds purchased	(260,773)	(96,501)
Repayment of long-term debt	0	(132,550)
Payment of contingent consideration	0	(4,050)
Dividends paid to common stockholders	(68,545)	(68,599)
Dividends paid to preferred stockholders	(4,163)	(4,163)
Common stock repurchase program	(180,987)	(20,403)
Common shares acquired related to stock compensation plan activity	(21,782)	(13,496)
Net cash provided by financing activities	1,081,316	933,300
Net increase (decrease) in cash and cash equivalents	437,842	(170,567)
Cash and cash equivalents, beginning of period	2,074,434	1,715,795
Cash and cash equivalents, end of period	$ 2,512,276	$ 1,545,228