CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023
Operating Activities:
Net income	$ 509,683	$ 499,146
Adjustments to reconcile net income to net cash provided by operating activities
Provision for credit losses	84,068	71,482
Depreciation, amortization and accretion, net	70,884	62,591
Stock-based compensation expense	27,568	24,532
(Accretion) amortization of discount/premium on securities, net	(1,380)	1,201
Accretion of discount and deferred fees on loans, net	(11,876)	(13,105)
Mortgage servicing rights fair value changes	26,106	13,065
Non-designated derivatives fair value changes, net	54,507	(271)
Originations and purchases of mortgage loans held-for-sale	(1,964,576)	(1,532,325)
Early buy-out exercises of mortgage loans held-for-sale guaranteed by U.S. government agencies, net of subsequent paydowns or payoffs	(22,558)	9,323
Proceeds from sales of mortgage loans held-for-sale	1,824,513	1,500,870
Bank owned life insurance (“BOLI”) gains	(4,519)	(2,849)
Decrease (increase) in trading securities, net	1,235	(536)
(Increase) decrease in brokerage customer receivables, net	(6,070)	2,345
Gains on mortgage loans sold	(47,978)	(27,777)
Gains on premium financing receivables sold	(4,575)	(890)
(Gains) losses on investment securities, net	(233)	959
(Gains) losses on sales of premises and equipment, net	(93)	1,547
(Gains) losses on sales and fair value adjustments of other real estate owned, net	(1,234)	121
Increase in accrued interest receivable and other assets, net	(46,711)	(269,677)
(Decrease) increase in accrued interest payable and other liabilities, net	(256,022)	156,697
Net Cash Provided by Operating Activities	230,739	496,449
Investing Activities:
Proceeds from calls and sales of available-for-sale securities	1,218,695	1,879,682
Proceeds from payments and maturities of available-for-sale securities	360,773	227,519
Proceeds from payments, maturities and calls of held-to-maturity securities	178,553	138,154
Proceeds from sales of equity securities with readily determinable fair value	51,792	23,592
Proceeds from sales and capital distributions of equity securities without readily determinable fair value	2,226	67
Purchases of available-for-sale securities	(1,116,875)	(1,731,266)
Purchases of held-to-maturity securities	0	(407,527)
Purchases of equity securities with readily determinable fair value	(33,322)	(45,954)
Purchases of equity securities without readily determinable fair value	(6,933)	(9,350)
(Purchases) redemptions of Federal Home Loan Bank and Federal Reserve Bank stock, net	(61,905)	20,719
Distributions from investments in partnerships, net	2,586	5,540
Net cash received (paid) in business combinations	531,308	(5,147)
Proceeds from sales of premium financing receivables, net	627,450	405,560
Proceeds from sales of other real estate owned	11,481	1,635
Increase in interest-bearing deposits with banks, net	(1,566,241)	(458,115)
Increase in loans, net	(4,361,365)	(2,644,535)
Redemption of BOLI	304	553
Purchases of premises and equipment, net	(66,457)	(29,218)
Net Cash Used for Investing Activities	(4,227,930)	(2,628,091)
Financing Activities:
Increase in deposit accounts, net	3,697,621	2,090,137
Increase in other borrowings, net	7,352	48,016
Increase in Federal Home Loan Bank advances, net	845,238	10,000
Cash payments to settle contingent consideration liabilities recognized in business combinations	0	(57)
Repayment of subordinated notes	(140,000)	0
Issuance of common shares resulting from the exercise of stock options, employee stock purchase plan and director compensation plan	4,892	6,667
Common stock repurchases for tax withholdings related to stock-based compensation	(3,881)	(1,662)
Dividends paid	(106,367)	(94,277)
Net Cash Provided by Financing Activities	4,304,855	2,058,824
Net Increase (Decrease) in Cash and Cash Equivalents	307,664	(72,818)
Cash and Cash Equivalents at Beginning of Period	423,464	490,966
Cash and Cash Equivalents at End of Period	$ 731,128	$ 418,148