Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Operating activities
Net income	$ 46,078	$ 33,547
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	7,960	1,500
Depreciation, amortization and accretion	9,237	12,804
Deferred income tax expense	2,667	4,649
Funding of mortgage loans held for sale	(258,946)	(595,046)
Proceeds from sales of mortgage loans held for sale	212,755	769,797
Gains on sales of mortgage loans held for sale	(4,769)	(6,047)
Losses (gains) on sales of premises and equipment	2	(3)
Stock-based compensation expense	3,445	3,338
(Increase) decrease in other assets	(10,945)	5,746
Decrease in other liabilities	(14,866)	(24,469)
Net cash (used in) provided by operating activities	(7,382)	205,816
Investing activities
Purchases of securities available for sale	0	(285,635)
Proceeds from call/maturities of securities available for sale	45,342	128,155
Purchases of securities held to maturity	0	(79,434)
Proceeds from call/maturities of securities held to maturity	25,424	7,620
Net increase in loans	(195,617)	(264,251)
Purchases of premises and equipment	(8,237)	(2,030)
Proceeds from sales of premises and equipment	0	100
Purchase of bank-owned life insurance	0	(80,000)
Net change in FHLB stock	(22,130)	(422)
Proceeds from sales of other assets	647	956
Net cash paid in acquisition of businesses	0	(10,066)
Other, net	1,340	207
Net cash used in investing activities	(153,231)	(584,800)
Financing activities
Net decrease in noninterest-bearing deposits	(313,879)	(11,868)
Net increase in interest-bearing deposits	738,933	97,041
Net increase in short-term borrowings	19,825	67,852
Repayment of long-term debt	0	(32,008)
Cash paid for dividends	(12,561)	(12,505)
Net cash provided by financing activities	432,318	108,512
Net increase (decrease) in cash and cash equivalents	271,705	(270,472)
Cash and cash equivalents at beginning of period	575,992	1,877,965
Cash and cash equivalents at end of period	847,697	1,607,493
Supplemental disclosures
Cash paid for interest	41,239	10,324
Cash paid for income taxes	17,443	6,195
Noncash transactions:
Transfers of loans to other real estate owned	3,623	200
Recognition of operating right-of-use assets	531	30
Recognition of operating lease liabilities	$ 531	$ 30