Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash Flows From Operating Activities
Net income (loss)	$ (27,586)	$ 86,818
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation	7,790	7,079
Amortization of other intangible assets	4,811	3,075
Amortization of tax credit investments	1,516	1,202
Net premium amortization on investment securities	4,462	3,606
Accretion income related to acquired loans	(14,241)	(4,695)
Share-based compensation expense	6,284	1,747
Provision for credit losses	97,569	(17,356)
Debt securities (gains) losses, net	(342)	(1,993)
Net (gains) losses on sales of loans and other assets	(2,381)	(10,330)
Increase in cash surrender value of company-owned life insurance	(3,524)	(2,714)
Residential real estate loans originated for sale	(205,945)	(326,118)
Proceeds from sales of residential real estate loans	220,534	349,730
(Increase) decrease in interest receivable	635	4,465
(Increase) decrease in other assets	98,413	32,647
Increase (decrease) in accrued expenses and other liabilities	(26,935)	(43,966)
Net cash flows provided by (used in) operating activities	161,060	83,197
Cash Flows From Investing Activities
Cash received from acquisitions, net	1,912,629
Cash paid from acquisitions, net		0
Purchases of investment securities available-for-sale	(814,796)	(1,245,673)
Purchases of investment securities held-to-maturity	(30,418)	0
Purchases of Federal Home Loan Bank/Federal Reserve Bank stock	(69,818)	0
Purchases of equity securities	(904)	0
Proceeds from maturities, prepayments, and calls of investment securities available-for-sale	342,435	428,614
Proceeds from sales of investment securities available-for-sale	10,839	52,468
Proceeds from maturities, prepayments, and calls of investment securities held-to-maturity	2,752	0
Proceeds from sales of Federal Home Loan Bank/Federal Reserve Bank stock	54,897	16
Proceeds from sales of equity securities	41,313	227
Loan originations and payments, net	(336,091)	(134,082)
Proceeds from company-owned life insurance death benefits	1,582	2,042
Proceeds from sales of premises and equipment and other assets	2,751	7,632
Purchases of premises and equipment and other assets	(9,588)	(12,879)
Net cash flows provided by (used in) investing activities	1,107,583	(901,635)
Net increase (decrease) in:
Deposits	(211,209)	812,302
Federal funds purchased and interbank borrowings	1,445	(244)
Securities sold under agreements to repurchase	(18,194)	(35,924)
Other borrowings	26,566	13,441
Payments for maturities of Federal Home Loan Bank advances	(6)	(125,004)
Payments for modification of Federal Home Loan Bank advances	0	(2,156)
Proceeds from Federal Home Loan Bank advances	200,000	50,000
Cash dividends paid	(42,799)	(23,195)
Common stock repurchased	(70,078)	(2,856)
Common stock issued	165	139
Net cash flows provided by (used in) financing activities	(114,110)	686,503
Net increase (decrease) in cash and cash equivalents	1,154,533	(131,935)
Cash and cash equivalents at beginning of period	822,019	589,712
Cash and cash equivalents at end of period	1,976,552	457,777
Supplemental cash flow information:
Total interest paid	17,854	13,302
Total income taxes paid (net of refunds)	1,471	1,400
Investment securities purchased but not settled	22,183	112,489
Securities transferred from available-for-sale to held-to-maturity	2,038,900	0
Operating lease right-of-use assets obtained in exchange for lease obligations	2,249	988
Stock issued for acquisitions, net	2,446,312
Common Stock
Stock issued for acquisitions, net	129,365	0
Preferred Stock
Stock issued for acquisitions, net	$ 243,870	$ 0