Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash flows from operating activities:
Net income	$ 63,252	$ 35,171
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of premises and equipment	4,066	4,213
Allocation of ESOP stock	720	608
Stock compensation	2,726	2,479
Net excess tax expense on stock compensation	93	123
Amortization of servicing asset	50	21
Net premium amortization in excess of discount accretion on securities	2,923	1,415
Net amortization of deferred costs on borrowings	489	168
Amortization of core deposit intangible	2,756	3,122
Net accretion of purchase accounting adjustments	(6,800)	(11,291)
Net amortization of deferred costs and discounts on loans	70	506
(Benefit) provision for credit losses	(7,080)	19,618
Net write down of fixed assets held-for-sale to net realizable value	552	2,258
Net (gain) loss on sale of fixed assets	(1)	6
Net gain on equity securities	(8,863)	(356)
Net gain on sales of loans	(3,195)	(929)
Proceeds from sales of residential loans held for sale	100,251	55,534
Mortgage loans originated for sale	(53,025)	(76,855)
Increase in value of bank owned life insurance	(3,131)	(3,096)
Net gain on sale of assets held for sale	(318)	0
Decrease (increase) in interest and dividends receivable	7,255	(11,976)
Deferred tax (benefit) provision	(95)	161
Decrease in other assets	35,683	186
Increase in other liabilities	424	60,171
Total adjustments	75,550	46,086
Net cash provided by operating activities	138,802	81,257
Cash flows from investing activities:
Net increase in loans receivable	(57,435)	(650,750)
Proceeds from sale of loans	825	71,604
Purchase of debt securities available-for-sale	(117,421)	(30,552)
Purchase of debt securities held-to-maturity	(335,071)	(9,749)
Purchase of equity investments	(72,414)	(120)
Proceeds from sale of equity investments	98,776	889
Proceeds from maturities and calls of debt securities available-for-sale	60,850	31,108
Proceeds from maturities and calls of debt securities held-to-maturity	12,470	24,389
Proceeds from sales of debt securities available-for-sale	0	5,869
Principal repayments on debt securities available-for-sale	85	185
Proceeds from bank owned life insurance	8,776	310
Proceeds from the redemption of restricted equity investments	826	61,727
Purchases of restricted equity investments	(1,287)	(59,448)
Proceeds from sales of other real estate owned	0	323
Proceeds from sales of assets held-for-sale	2,601	0
Purchases of premises and equipment	(15,250)	(3,593)
Net cash consideration received for acquisition	0	23,460
Net cash used in investing activities	(301,752)	(454,168)
Cash flows from financing activities:
(Decrease) increase in deposits	(11,452)	1,046,687
Increase (decrease) in short-term borrowings	13,021	(201,651)
Proceeds from Federal Home Loan Bank advances	0	525,000
Repayments of Federal Home Loan Bank advances	0	(496,200)
Proceeds from Federal Reserve Bank advances	0	3,778
Net proceeds from issuance of subordinated notes	0	122,717
Repayments of other borrowings	(7,557)	(53)
Increase in advances by borrowers for taxes and insurance	3,985	(517)
Exercise of stock options	1,828	878
Payment of employee taxes withheld from stock awards	(1,175)	(2,051)
Purchase of treasury stock	(20,939)	(14,814)
Net proceeds from the issuance of preferred stock	0	55,713
Dividends paid	(22,333)	(20,494)
Net cash (used) provided by financing activities	(44,622)	1,018,993
Net (decrease) increase in cash and due from banks and restricted cash	(207,572)	646,082
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	1,084,029	721,049
Restricted cash at end of period	27,060	58,259
Cash and due from banks and restricted cash at end of period	1,111,089	779,308
Cash paid during the period for:
Interest	20,943	36,080
Income taxes	25,699	2,932
Non-cash activities:
Accretion of unrealized loss on securities reclassified to held-to-maturity	351	388
Net loan (recoveries) charge-offs	(56)	922
Transfer of premises and equipment to assets held-for-sale	533	4,043
Transfer of loans receivable to other real estate owned	0	106
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	(345)
Other assets	0	9,268
Goodwill and other intangible assets, net	0	140,654
Total non-cash assets acquired	0	1,958,616
Liabilities assumed:
Deposits	0	1,594,403
Borrowings	0	92,618
Other liabilities	0	33,610
Total liabilities assumed	0	1,720,631
Mortgage-backed Securities Held-to-Maturity
Cash flows from investing activities:
Principal repayments on debt securities held-to-maturity	$ 111,917	$ 80,180