CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Operating Activities:
Net income	$ 221,904	$ 258,257
Adjustments to reconcile net income to net cash provided by operating activities
Provision for credit losses	24,523	(60,646)
Depreciation, amortization and accretion, net	45,187	51,485
Stock-based compensation expense	14,889	6,194
Amortization of premium on securities, net	1,475	3,797
Accretion of discount and deferred fees on loans, net	(13,960)	(47,975)
Mortgage servicing rights fair value changes, net	(39,658)	6,203
Non-designated derivatives fair value changes, net	(236)	(241)
Originations and purchases of mortgage loans held-for-sale	(1,716,502)	(3,945,978)
Early buy-out exercises of mortgage loans held-for-sale guaranteed by U.S. Government Agencies, net of subsequent paydowns or payoffs	43,288	(6,997)
Proceeds from sales of mortgage loans held-for-sale	1,916,314	4,357,804
Bank owned life insurance (“BOLI”) loss (income)	836	(2,466)
Decrease (increase) in trading securities, net	51	(1,996)
Decrease (increase) in brokerage customer receivables, net	4,541	(5,657)
Gains on mortgage loans sold	(31,137)	(132,012)
Losses (gains) on investment securities, net	10,579	(2,439)
Losses (gains) on sales of premises and equipment, net, and sale of related deposit liabilities	2,126	(3,782)
Gains on sales and fair value adjustments of other real estate owned, net	(868)	(332)
Decrease in accrued interest receivable and other assets, net	130,148	143,200
Increase in accrued interest payable and other liabilities, net	209,824	32,344
Net Cash Provided by Operating Activities	823,324	648,763
Investing Activities:
Proceeds from maturities and calls of available-for-sale securities	208,534	908,160
Proceeds from maturities and calls of held-to-maturity securities	124,986	137,273
Proceeds from sales of available-for-sale securities	0	2,376
Proceeds from sales of equity securities with readily determinable fair value	18,753	6,259
Proceeds from sales and capital distributions of equity securities without readily determinable fair value	529	1,137
Purchases of available-for-sale securities	(1,224,316)	(290,583)
Purchases of held-to-maturity securities	(596,897)	(2,257,847)
Purchases of equity securities with readily determinable fair value	(27,805)	0
Purchases of equity securities without readily determinable fair value	(8,480)	(3,359)
Purchases of Federal Home Loan Bank and Federal Reserve Bank stock, net	(760)	(1,037)
Distributions from investments in partnerships, net	3,196	44
Proceeds from sales of other real estate owned	3,669	5,314
Decrease in securities purchased under resale agreements with terms exceeding three months, net	225,000	0
Decrease in interest-bearing deposits with banks, net	2,105,160	96,948
Increase in loans, net	(2,202,286)	(795,270)
Redemption of BOLI	960	0
Purchases of premises and equipment, net	(23,366)	(12,113)
Net Cash Used for Investing Activities	(1,393,123)	(2,202,698)
Financing Activities:
Increase in deposit accounts, net	497,735	1,715,840
Decrease in other borrowings, net	(5,059)	(9,230)
(Decrease) increase in Federal Home Loan Bank advances, net	(75,000)	12,629
Proceeds from common stock offering, net	286,315	0
Cash payments to settle contingent consideration liabilities recognized in business combinations	0	(16,583)
Issuance of common shares resulting from the exercise of stock options, employee stock purchase plan and conversion of common stock warrants	6,464	13,115
Dividends paid	(52,914)	(49,301)
Net Cash Provided by Financing Activities	657,541	1,666,470
Net Increase in Cash and Cash Equivalents	87,742	112,535
Cash and Cash Equivalents at Beginning of Period	411,205	322,474
Cash and Cash Equivalents at End of Period	$ 498,947	$ 435,009