Consolidated Statements of Cash Flows (Unaudited) - USD ($)	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Operating activities
Net income	$ 116,554,000	$ 119,792,000
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	16,275,000	13,300,000
Depreciation, amortization and accretion	26,723,000	33,590,000
Deferred income tax (benefit) expense	(1,231,000)	3,600,000
Proceeds from sale of MSR	0	18,525,000
Gain on sale of MSR	0	(2,960,000)
Funding of mortgage loans held for sale	(1,057,277,000)	(1,436,158,000)
Proceeds from sales of mortgage loans held for sale	934,761,000	1,757,353,000
Gains on sales of mortgage loans held for sale	(12,639,000)	(9,808,000)
Losses on sales of securities	22,438,000	0
Losses (gains) on sales of premises and equipment	8,000	(245,000)
Stock-based compensation expense	10,264,000	8,558,000
Increase in other assets	(30,741,000)	(32,187,000)
Increase (decrease) in other liabilities	22,989,000	(10,253,000)
Net cash provided by operating activities	48,124,000	463,107,000
Investing activities
Purchases of securities available for sale	(9,646,000)	(708,457,000)
Proceeds from sales of securities available for sale	488,981,000	0
Proceeds from call/maturities of securities available for sale	124,150,000	336,504,000
Purchases of securities held to maturity	0	(91,803,000)
Proceeds from call/maturities of securities held to maturity	83,945,000	35,980,000
Net increase in loans	(607,335,000)	(1,057,998,000)
Purchases of premises and equipment	(16,394,000)	(10,374,000)
Proceeds from sales of premises and equipment	0	1,230,000
Purchase of bank-owned life insurance	0	(80,000,000)
Net change in FHLB stock	20,794,000	(7,538,000)
Proceeds from sales of other assets	2,833,000	2,458,000
Net cash paid in acquisition of businesses	0	(10,066,000)
Other, net	1,844,000	2,607,000
Net cash provided by (used in) investing activities	89,172,000	(1,587,457,000)
Financing activities
Net (decrease) increase in noninterest-bearing deposits	(824,559,000)	109,096,000
Net increase (decrease) in interest-bearing deposits	1,494,703,000	(582,696,000)
Net (decrease) increase in short-term borrowings	(604,570,000)	269,391,000
Repayment of long-term debt	0	(32,417,000)
Cash paid for dividends	(37,706,000)	(37,489,000)
Net cash provided by (used in) financing activities	27,868,000	(274,115,000)
Net increase (decrease) in cash and cash equivalents	165,164,000	(1,398,465,000)
Cash and cash equivalents at beginning of period	575,992,000	1,877,965,000
Cash and cash equivalents at end of period	741,156,000	479,500,000
Supplemental disclosures
Cash paid for interest	153,732,000	32,506,000
Cash paid for income taxes	30,922,000	19,245,000
Noncash transactions:
Transfers of loans to other real estate owned	10,073,000	1,828,000
Recognition of operating right-of-use assets	3,077,000	3,045,000
Recognition of operating lease liabilities	$ 3,077,000	$ 3,045,000