CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Operating Activities:
Net income	$ 600,820	$ 509,683
Adjustments to reconcile net income to net cash provided by operating activities
Provision for credit losses	67,965	84,068
Depreciation, amortization and accretion, net	88,905	70,884
Stock-based compensation expense	30,646	27,568
Accretion of discount on securities, net	(4,412)	(1,380)
Accretion of discount and deferred fees on loans, net	(15,092)	(11,876)
Mortgage servicing rights fair value changes	29,684	26,106
Non-designated derivatives fair value changes, net	(9,065)	54,507
Originations and purchases of mortgage loans held-for-sale	(1,785,392)	(1,964,576)
Early buy-out exercises of mortgage loans held-for-sale guaranteed by U.S. government agencies, net of subsequent paydowns or payoffs	(15,773)	(22,558)
Proceeds from sales of mortgage loans held-for-sale	1,785,096	1,824,513
Bank owned life insurance (“BOLI”) gains	(4,644)	(4,519)
Decrease in trading securities, net	4,072	1,235
Decrease (increase) in brokerage customer receivables, net	18,102	(6,070)
Gains on mortgage loans sold	(49,990)	(47,978)
Gains on premium financing receivables sold	0	(4,575)
Gains on investment securities, net, and dividend reinvestment on equity securities	(6,818)	(233)
Losses (gains) on sales of premises and equipment, net	418	(93)
Losses (gains) on sales and fair value adjustments of other real estate owned, net	816	(1,234)
Decrease (increase) in accrued interest receivable and other assets, net	59,739	(46,711)
Decrease in accrued interest payable and other liabilities, net	(136,388)	(256,022)
Net Cash Provided by Operating Activities	658,689	230,739
Investing Activities:
Proceeds from calls and sales of available-for-sale securities	705,703	1,218,695
Proceeds from payments and maturities of available-for-sale securities	402,735	360,773
Proceeds from payments, maturities and calls of held-to-maturity securities	174,383	178,553
Proceeds from sales of equity securities with readily determinable fair value	226,542	51,792
Proceeds from sales and capital distributions of equity securities without readily determinable fair value	0	2,226
Purchases of available-for-sale securities	(3,040,628)	(1,116,875)
Purchases of equity securities with readily determinable fair value	(63,413)	(33,322)
Purchases of equity securities without readily determinable fair value	(1,682)	(6,933)
Purchases of Federal Home Loan Bank and Federal Reserve Bank stock, net	(1,348)	(61,905)
(Contributions to) distributions from investments in partnerships, net	(13,422)	2,586
Net cash received in business combinations	0	531,308
Proceeds from sales of premium financing receivables, net	0	627,450
Proceeds from sales of other real estate owned	0	11,481
Decrease (increase) in interest-bearing deposits with banks, net	994,409	(1,566,241)
Increase in loans, net	(4,017,366)	(4,361,365)
Redemption of BOLI	0	304
Purchases of premises and equipment, net	(26,921)	(66,457)
Net Cash Used for Investing Activities	(4,661,008)	(4,227,930)
Financing Activities:
Increase in deposit accounts, net	4,199,032	3,697,621
Increase in other borrowings, net	33,753	7,352
Increase in Federal Home Loan Bank advances, net	0	845,238
Proceeds from the issuance of preferred stock, net	414,148	0
Redemption of preferred stock	(412,500)	0
Repayment of subordinated notes	0	(140,000)
Issuance of common shares resulting from the exercise of stock options, employee stock purchase plan and director compensation plan	5,387	4,892
Common stock repurchases for tax withholdings related to stock-based compensation	(2,997)	(3,881)
Dividends paid	(127,571)	(106,367)
Net Cash Provided by Financing Activities	4,109,252	4,304,855
Net Increase in Cash and Cash Equivalents	106,933	307,664
Cash and Cash Equivalents at Beginning of Period	458,536	423,464
Cash and Cash Equivalents at End of Period	$ 565,469	$ 731,128