CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Operating Activities:
Net income	$ 334,948	$ 221,904
Adjustments to reconcile net income to net cash provided by operating activities
Provision for credit losses	51,559	24,523
Depreciation, amortization and accretion, net	34,997	45,187
Stock-based compensation expense	16,403	14,889
Amortization of premium on securities, net	743	1,475
Accretion of discount and deferred fees on loans, net	(9,067)	(13,960)
Mortgage servicing rights fair value changes, net of economic hedge	13,190	(39,658)
Non-designated derivatives fair value changes, net	(2,088)	(236)
Originations and purchases of mortgage loans held-for-sale	(980,276)	(1,716,502)
Early buy-out exercises of mortgage loans held-for-sale guaranteed by U.S. government agencies, net of subsequent paydowns or payoffs	29,890	43,288
Proceeds from sales of mortgage loans held-for-sale	900,046	1,916,314
Bank owned life insurance (“BOLI”) (gains) losses	(2,673)	836
(Increase) decrease in trading securities, net	(1,900)	51
Decrease in brokerage customer receivables, net	665	4,541
Gains on mortgage loans sold	(24,133)	(31,137)
(Gains) losses on investment securities, net	(1,398)	10,579
Losses on sales of premises and equipment, net	1,594	2,126
Losses (gains) on sales and fair value adjustments of other real estate owned, net	100	(868)
(Increase) decrease in accrued interest receivable and other assets, net	(83,646)	130,148
Increase in accrued interest payable and other liabilities, net	129,238	209,824
Net Cash Provided by Operating Activities	408,192	823,324
Investing Activities:
Proceeds from maturities and calls of available-for-sale securities	2,032,564	208,534
Proceeds from maturities and calls of held-to-maturity securities	84,015	124,986
Proceeds from sales of available-for-sale securities	0	0
Proceeds from sales of equity securities with readily determinable fair value	23,592	18,753
Proceeds from sales and capital distributions of equity securities without readily determinable fair value	67	529
Purchases of available-for-sale securities	(1,359,722)	(1,224,316)
Purchases of held-to-maturity securities	(8,439)	(596,897)
Purchases of equity securities with readily determinable fair value	(26,677)	(27,805)
Purchases of equity securities without readily determinable fair value	(5,600)	(8,480)
Redemptions (purchases) of Federal Home Loan Bank and Federal Reserve Bank stock, net	29,642	(760)
Distributions from investments in partnerships, net	4,995	3,196
Net cash paid in business combinations	(4,966)	0
Proceeds from sales of other real estate owned	1,168	3,669
Decrease in securities purchased under resale agreements with terms exceeding three months, net	0	225,000
(Increase) decrease in interest-bearing deposits with banks, net	(172,149)	2,105,160
Increase in loans, net	(1,820,788)	(2,202,286)
Redemption of BOLI	0	960
Purchases of premises and equipment, net	(9,318)	(23,366)
Net Cash Used for Investing Activities	(1,231,616)	(1,393,123)
Financing Activities:
Increase in deposit accounts, net	1,136,159	497,735
Increase (decrease) in other borrowings, net	59,552	(5,059)
Decrease in Federal Home Loan Bank advances, net	(290,000)	(75,000)
Proceeds from common stock offering, net	0	286,315
Cash payments to settle contingent consideration liabilities recognized in business combinations	(57)	0
Issuance of common shares resulting from the exercise of stock options and employee stock purchase plan	5,168	6,464
Common stock repurchases for tax withholdings related to stock-based compensation	(1,662)	0
Dividends paid	(62,785)	(52,914)
Net Cash Provided by Financing Activities	846,375	657,541
Net Increase in Cash and Cash Equivalents	22,951	87,742
Cash and Cash Equivalents at Beginning of Period	490,966	411,205
Cash and Cash Equivalents at End of Period	$ 513,917	$ 498,947