CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash flows from operating activities:
Net income	$ 87,419	$ 30,245
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of premises and equipment	6,150	6,291
Allocation of ESOP stock	1,056	866
Stock compensation	4,231	3,729
Net excess tax expense on stock compensation	93	123
Amortization of servicing asset	60	65
Net premium amortization in excess of discount accretion on securities	5,719	2,126
Net amortization of deferred costs on borrowings	688	355
Amortization of core deposit intangible	4,110	4,660
Net accretion of purchase accounting adjustments	(10,720)	(15,802)
Net amortization of deferred costs and discounts on loans	606	1,135
(Benefit) provision for credit losses	(10,259)	55,332
Net gain on sale and write-down of other real estate owned	0	(101)
Net write down of fixed assets held-for-sale to net realizable value	3,114	4,193
Net loss on sale of fixed assets	11	6
Net (gain) loss on equity securities	(8,397)	3,220
Net gain on sales of loans	(3,180)	(1,930)
Proceeds from sales of residential loans held for sale	101,992	113,708
Mortgage loans originated for sale	(53,935)	(134,907)
Increase in value of bank owned life insurance	(4,771)	(4,626)
Net gain on sale of assets held for sale	(318)	0
Decrease (increase) in interest and dividends receivable	2,757	(14,836)
Deferred tax provision	570	99
Decrease in other assets	29,366	2,301
(Decrease) increase in other liabilities	(37,311)	71,285
Total adjustments	31,632	97,292
Net cash provided by operating activities	119,051	127,537
Cash flows from investing activities:
Net increase in loans receivable	(203,104)	(654,461)
Proceeds from sale of loans	825	71,604
Purchase of residential loan pool	(219,745)	0
Premiums paid on purchased loan pool	(6,318)	0
Purchase of debt securities available-for-sale	(200,034)	(57,487)
Purchase of debt securities held-to-maturity	(381,032)	(79,115)
Purchase of equity investments	(85,077)	(53,726)
Proceeds from sale of equity investments	98,776	891
Proceeds from maturities and calls of debt securities available-for-sale	93,835	41,101
Proceeds from maturities and calls of debt securities held-to-maturity	22,125	41,583
Proceeds from sales of debt securities available-for-sale	0	5,869
Principal repayments on debt securities available-for-sale	114	256
Principal repayments on debt securities held-to-maturity	168,059	128,683
Proceeds from bank owned life insurance	9,952	310
Proceeds from the redemption of restricted equity investments	1,110	62,354
Purchases of restricted equity investments	(2,069)	(59,489)
Proceeds from sales of other real estate owned	0	713
Proceeds from sales of assets held-for-sale	2,601	0
Purchases of premises and equipment	(26,493)	(9,014)
Net cash consideration received for acquisition	0	23,460
Net cash used in investing activities	(726,475)	(536,468)
Cash flows from financing activities:
Increase in deposits	347,672	1,362,996
Increase (decrease) in short-term borrowings	14,838	(211,649)
Proceeds from FHLB advances	0	525,000
Repayments of FHLB advances	0	(496,200)
Proceeds from Federal Reserve Bank advances	0	3,778
Net proceeds from issuance of subordinated notes	0	122,180
Repayments of other borrowings	(7,585)	(80)
Increase in advances by borrowers for taxes and insurance	4,918	5
Exercise of stock options	1,833	1,174
Payment of employee taxes withheld from stock awards	(1,176)	(2,084)
Purchase of treasury stock	(30,628)	(14,814)
Net proceeds from the issuance of preferred stock	0	55,529
Dividends paid	(33,437)	(31,723)
Net cash provided by financing activities	296,435	1,314,112
Net (decrease) increase in cash and due from banks and restricted cash	(310,989)	905,181
Supplemental Disclosure of Cash Flow Information:
Cash and due from banks and restricted cash at beginning of period	1,318,661	133,226
Cash and due from banks at beginning of period	1,272,134	120,544
Restricted cash at beginning of period	46,527	12,682
Cash and due from banks at end of period	981,126	980,870
Restricted cash at end of period	26,546	57,537
Cash and due from banks and restricted cash at end of period	1,007,672	1,038,407
Cash paid during the period for:
Interest	28,009	51,494
Income taxes	38,707	5,232
Non-cash activities:
Accretion of unrealized loss on securities reclassified to held-to-maturity	512	570
Net loan (recoveries) charge-offs	(442)	15,917
Transfer of loans receivable to loans held-for-sale	12,781	365,634
Transfer of premises and equipment to assets held-for-sale	1,476	4,043
Transfer of loans receivable to other real estate owned	0	106
Acquisition, Non-cash assets acquired
Securities	0	208,880
Restricted equity investments	0	5,334
Loans	0	1,558,480
Premises and equipment	0	9,744
Accrued interest receivable	0	4,161
Bank owned life insurance	0	22,440
Deferred tax assets, net	0	(509)
Other assets	0	10,073
Goodwill and other intangible assets, net	0	140,031
Total non-cash assets acquired	0	1,958,634
Liabilities assumed:
Deposits	0	1,594,403
Borrowings	0	92,618
Other liabilities	0	33,628
Total liabilities assumed	$ 0	$ 1,720,649