Consolidated Statements of Cash Flows (Unaudited) - USD ($)	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Operating activities
Net income	$ 74,721,000	$ 73,225,000
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Provision for credit losses	10,960,000	3,500,000
Depreciation, amortization and accretion	18,365,000	23,947,000
Deferred income tax expense	302,000	5,150,000
Funding of mortgage loans held for sale	(659,921,000)	(1,076,613,000)
Proceeds from sales of mortgage loans held for sale	526,853,000	1,345,924,000
Gains on sales of mortgage loans held for sale	(9,417,000)	(9,537,000)
Losses on sales of securities	22,438,000	0
Losses (gains) on sales of premises and equipment	7,000	(236,000)
Stock-based compensation expense	6,840,000	6,290,000
Increase in other assets	(26,264,000)	(2,867,000)
Increase (decrease) in other liabilities	3,576,000	(19,077,000)
Net cash (used in) provided by operating activities	(31,540,000)	349,706,000
Investing activities
Purchases of securities available for sale	0	(609,752,000)
Proceeds from sales of securities available for sale	488,981,000	0
Proceeds from call/maturities of securities available for sale	90,830,000	249,394,000
Purchases of securities held to maturity	0	(91,803,000)
Proceeds from call/maturities of securities held to maturity	54,123,000	17,262,000
Net increase in loans	(363,231,000)	(555,936,000)
Purchases of premises and equipment	(12,353,000)	(5,865,000)
Proceeds from sales of premises and equipment	0	933,000
Purchase of bank-owned life insurance	0	(80,000,000)
Net change in FHLB stock	13,268,000	(3,526,000)
Proceeds from sales of other assets	827,000	1,524,000
Net cash paid in acquisition of businesses	0	(10,066,000)
Other, net	1,668,000	622,000
Net cash provided by (used in) investing activities	274,113,000	(1,087,213,000)
Financing activities
Net (decrease) increase in noninterest-bearing deposits	(679,803,000)	23,273,000
Net increase (decrease) in interest-bearing deposits	1,288,198,000	(165,068,000)
Net (decrease) increase in short-term borrowings	(454,927,000)	69,215,000
Repayment of long-term debt	0	(32,417,000)
Cash paid for dividends	(25,134,000)	(24,993,000)
Net cash provided by (used in) financing activities	128,334,000	(129,990,000)
Net increase (decrease) in cash and cash equivalents	370,907,000	(867,497,000)
Cash and cash equivalents at beginning of period	575,992,000	1,877,965,000
Cash and cash equivalents at end of period	946,899,000	1,010,468,000
Supplemental disclosures
Cash paid for interest	91,861,000	19,959,000
Cash paid for income taxes	23,071,000	6,367,000
Noncash transactions:
Transfers of loans to other real estate owned	4,119,000	1,284,000
Recognition of operating right-of-use assets	611,000	1,595,000
Recognition of operating lease liabilities	$ 611,000	$ 1,595,000