Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Cash flows from operating activities:
Net (loss) income	$ 30,245	$ 65,124
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization of premises and equipment	6,291	6,448
Allocation of ESOP stock	866	1,182
Stock awards	3,729	3,140
Net excess tax benefit on stock compensation	123	(243)
Amortization of servicing asset	65	33
Net premium amortization in excess of discount accretion on securities	2,126	2,387
Net amortization of deferred costs on borrowings	355	161
Amortization of core deposit intangible	4,660	3,029
Net accretion of purchase accounting adjustments	(15,802)	(10,588)
Net amortization of deferred costs and discounts on loans	1,135	1,028
Provision for credit losses	55,332	1,281
Net (gain) loss on sale and write-down of other real estate owned	(101)	20
Net loss on sale and write down of fixed assets held-for-sale to net realizable value	4,193	7,289
Net loss (gain) on sale of fixed assets	6	(27)
Net unrealized loss (gain) on equity securities	3,220	(330)
Net gain on sales of loans	(1,930)	(15)
Proceeds from sales of mortgage loans held for sale	113,708	912
Mortgage loans originated for sale	(134,907)	(1,007)
Increase in value of bank owned life insurance	(4,626)	(4,045)
Net loss on sale of assets held for sale	0	5
Increase in interest and dividends receivable	(14,836)	(462)
Deferred tax provision	99	336
Decrease (increase) in other assets	2,301	(27,786)
Increase in other liabilities	71,285	34,110
Total adjustments	97,292	16,858
Net cash provided by operating activities	127,537	81,982
Cash flows from investing activities
Net increase in loans receivable	(654,461)	(92,658)
Proceeds from sale of loans	71,604	5,901
Purchase of loans receivable	0	(101,674)
Purchase of debt investment securities available-for-sale	(57,487)	(35,106)
Purchase of debt investment securities held-to-maturity	(651)	(3,577)
Payments to Acquire Mortgage Backed Securities (MBS) categorized as Held-to-maturity	(78,464)	0
Purchase of equity investments	(53,726)	(160)
Proceeds from sale of equity investments	891	0
Proceeds from maturities and calls of debt investment securities available-for-sale	41,101	28,447
Proceeds from maturities and calls of debt investment securities held-to-maturity	41,583	25,547
Proceeds from sales of debt investment securities available-for-sale	5,869	0
Principal repayments on debt mortgage-backed securities available-for-sale	256	0
Proceeds from bank owned life insurance	310	716
Proceeds from the redemption of restricted equity investments	62,354	85,894
Purchases of restricted equity investments	(59,489)	(90,892)
Proceeds from sales of other real estate owned	713	2,060
Proceeds from sales of assets held-for-sale	0	412
Purchases of premises and equipment	(9,014)	(3,245)
Net cash consideration received for acquisition	23,460	59,395
Net cash used in investing activities	(536,468)	(28,324)
Cash flows from financing activities
Increase (decrease) in deposits	1,362,996	(42,306)
(Decrease) increase in short-term borrowings	(211,649)	107,307
Proceeds from Federal Home Loan Bank advances	525,000	35,000
Repayments of Federal Home Loan Bank advances	(496,200)	(76,618)
Proceeds from Federal Reserve Bank advances	3,778	0
Net proceeds from issuance of subordinated notes	122,180	0
Repayments of other borrowings	(80)	(216)
Increase in advances by borrowers for taxes and insurance	5	2,164
Exercise of stock options	1,174	1,145
Payment of employee taxes withheld from stock awards	(2,084)	(2,786)
Purchase of treasury stock	(14,814)	(18,054)
Net proceeds from the issuance of preferred stock	55,529	0
Dividends paid	(31,723)	(25,943)
Net cash provided by (used in) financing activities	1,314,112	(20,307)
Net increase in cash and due from banks and restricted cash	905,181	33,351
Supplemental Disclosure of Cash Flow Information:
Cash and due from banks and restricted cash at beginning of period	133,226	122,328
Cash and due from banks at beginning of period	120,544	120,792
Restricted cash at beginning of period	12,682	1,536
Cash and due from banks at end of period	980,870	140,901
Restricted cash at end of period	57,537	14,778
Cash and due from banks and restricted cash at end of period	1,038,407	155,679
Cash paid during the period for
Interest	51,494	39,293
Income taxes	5,232	16,506
Accretion of unrealized loss on securities reclassified to held-to-maturity	570	629
Net loan charge-offs	15,917	1,222
Transfer of premises and equipment to assets held-for-sale	4,043	1,607
Transfer of loans receivable to loans held-for-sale	365,634	0
Transfer of loans receivable to other real estate owned	106	993
Non-cash assets acquired
Securities	208,880	103,775
Restricted equity investments	5,334	313
Loans	1,558,480	307,778
Premises and equipment	9,744	3,389
Accrued interest receivable	4,161	1,390
Bank owned life insurance	22,440	10,460
Deferred tax asset	(509)	3,829
Other assets	10,073	1,405
Goodwill and other intangible assets, net	140,031	38,780
Total non-cash assets acquired	1,958,634	471,119
Liabilities assumed:
Deposits	1,594,403	449,018
Borrowings	92,618	0
Other liabilities	33,628	5,015
Total liabilities assumed	1,720,649	454,033
Debt Securities
Cash flows from investing activities
Principal repayments on debt	857	1,334
Mortgage-backed Securities Held-to-Maturity
Cash flows from investing activities
Principal repayments on debt	$ 127,826	$ 89,282