Consolidated Statements of Cash Flows (Unaudited) - USD ($)	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Operating activities
Net income	$ 119,792,000	$ 138,838,000
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for (recovery of provision for) credit losses	13,300,000	(1,200,000)
Depreciation, amortization and accretion	33,590,000	34,421,000
Deferred income tax expense	3,600,000	5,071,000
Proceeds From Sale Of Mortgage Servicing Rights MSR, Operating Activities	18,525,000	0
Gain on sale of MSR	(2,960,000)	0
Funding of mortgage loans held for sale	(1,436,158,000)	(3,189,474,000)
Proceeds from sales of mortgage loans held for sale	1,757,353,000	3,230,039,000
Gains on sales of mortgage loans held for sale	(9,808,000)	(71,598,000)
Valuation adjustment to mortgage servicing rights	0	(13,561,000)
Gains on sales of securities	0	(2,121,000)
Gains on sales of premises and equipment	(245,000)	(519,000)
Stock-based compensation expense	8,558,000	7,736,000
Increase in other assets	(32,187,000)	(16,429,000)
Decrease in other liabilities	(10,253,000)	(31,032,000)
Net cash provided by operating activities	463,107,000	90,171,000
Investing activities
Purchases of securities available for sale	(708,457,000)	(1,743,105,000)
Proceeds from sales of securities available for sale	0	176,406,000
Proceeds from call/maturities of securities available for sale	336,504,000	329,520,000
Purchases of securities held to maturity	(91,803,000)	0
Proceeds from call/maturities of securities held to maturity	35,980,000	0
Net (increase) decrease in loans	(1,057,998,000)	917,343,000
Purchases of premises and equipment	(10,374,000)	(16,797,000)
Proceeds from sales of premises and equipment	1,230,000	8,715,000
Purchase of bank-owned life insurance	(80,000,000)	(50,000,000)
Net change in FHLB stock	(7,538,000)	(1,226,000)
Proceeds from sales of other assets	2,458,000	4,081,000
Net cash paid in acquisition of businesses	(10,066,000)	0
Other, net	2,607,000	2,803,000
Net cash used in investing activities	(1,587,457,000)	(372,260,000)
Financing activities
Net increase in noninterest-bearing deposits	109,096,000	807,602,000
Net (decrease) increase in interest-bearing deposits	(582,696,000)	388,146,000
Net increase (decrease) in short-term borrowings	269,391,000	(10,087,000)
Repayment of long-term debt	(32,417,000)	(1,742,000)
Cash paid for dividends	(37,489,000)	(37,578,000)
Repurchase of shares in connection with stock repurchase program	0	(21,314,000)
Net cash (used in) provided by financing activities	(274,115,000)	1,125,027,000
Net (decrease) increase in cash and cash equivalents	(1,398,465,000)	842,938,000
Cash and cash equivalents at beginning of period	1,877,965,000	633,203,000
Cash and cash equivalents at end of period	479,500,000	1,476,141,000
Supplemental disclosures
Cash paid for interest	32,506,000	37,827,000
Cash paid for income taxes	19,245,000	41,248,000
Noncash transactions:
Transfers of loans to other real estate owned	1,828,000	3,171,000
Recognition of operating right-of-use assets	3,045,000	6,718,000
Recognition of operating lease liabilities	$ 3,045,000	$ 6,718,000