Consolidated Statements of Cash Flows - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating Activities
Net income	$ 34,674	$ 41,279	$ 55,090
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for credit losses	23,129	2,811	575
Depreciation and amortization of premises and equipment	6,212	5,930	5,792
Net gain on sales of loans	(48)	(870)	(168)
Net loss on sales of securities	701	15	1,920
Net loss (gain) on sales of OREO	36	0	(27)
Net gain on sales of assets	0	(770)	(1,141)
Amortization of premium, net of accretion of discount	6,446	7,110	8,146
Fair value adjustments for financial assets and financial liabilities	2,142	5,353	4,122
Net loss from fair value adjustments on qualifying hedges	1,185	1,677	0
Income from bank owned life insurance	(3,814)	(3,534)	(3,099)
Life insurance proceeds	(659)	(462)	(2,998)
Stock-based compensation expense	6,450	7,763	7,016
Deferred Compensation	(4,403)	(3,078)	(3,061)
Amortization of core deposit intangibles	108	0	0
Deferred income tax	(4,637)	(3,895)	(2,664)
Decrease in other assets	2,605	706	824
Increase in other liabilities	1,151	3,735	6,976
Net cash provided by operating activities	71,278	63,770	77,303
Investing Activities
Purchases of premises and equipment	(2,512)	(4,213)	(5,409)
Net purchases of Federal Home Loan Bank-NY shares	14,617	361	2,807
Purchases of securities held-to-maturity	0	(30,030)	(2,653)
Proceeds from calls of securities held-to-maturity	180	2,568	1,130
Proceeds from prepayments of securities held-to-maturity	603	583	377
Purchases of securities available for sale	(217,405)	(146,183)	(305,059)
Proceeds from sales and calls of securities available for sale	232,970	65,493	128,474
Proceeds from maturities and prepayments of securities available for sale	271,533	144,673	73,968
Proceeds from sale of assets	0	813	1,184
Purchase of bank owned life insurance	0	(25,000)	0
Proceeds from life insurance	2,477	3,071	6,165
Net originations of loans	(55,276)	(800)	(111,351)
Purchases of loans	(193,289)	(221,222)	(282,703)
Proceeds from sale of loans	7,493	15,117	14,410
Proceeds from sale of OREO, net	203	0	665
Cash used in acquisition of Empire Bancorp, Inc.	(54,836)	0	0
Cash provided by acquisition of Empire Bancorp, Inc.	86,340	0	0
Net cash provided by (used in) investing activities	93,098	(194,769)	(477,995)
Financing Activities
Net increase in non-interest bearing deposits	174,104	21,325	28,478
Net decrease in interest-bearing deposits	39,591	84,540	546,322
Net (decrease) increase in mortgagors' escrow deposits	(5,159)	(486)	2,255
Net proceeds from short-term borrowed funds		15,750	165,250
Proceeds from long-term borrowings	215,378	225,000	40,996
Repayment of long-term borrowings	(451,999)	(257,102)	(270,088)
Purchases of treasury stock	(3,877)	(2,656)	(22,585)
Proceeds from issuance of common stock upon exercise of stock options		3	6
Cash dividends paid	(24,813)	(24,149)	(22,927)
Net cash (used in) provided by financing activities	(56,775)	62,225	467,707
Net increase (decrease) in cash and cash equivalents	107,601	(68,774)	67,015
Cash and cash equivalents, beginning of year	49,787	118,561	51,546
Cash and cash equivalents, end of year	157,388	49,787	118,561
Supplemental Cash Flow Disclosure
Interest paid	71,380	115,616	85,112
Income taxes paid	17,919	15,369	6,616
Taxes paid if excess tax benefits on stock-based compensation were not tax deductible	17,764	15,403	7,245
Non-cash activities:
Loans transferred to other real estate owned		239	673
Right-of-use assets		42,869
Operating lease liabilities		$ 51,780
Reclassification of the income tax effects of Tax Cuts and Jobs Act from accumulated other comprehensive income to retained earnings			$ 2,073
Assets acquired:
Securities available for sale	159,369
Net loans	669,682
Interest and dividends receivable	5,394
Bank premises and equipment, net	3,203
Federal Home Loan Bank of New York stock, at cost	1,135
Bank owned life insurance	21,992
Core deposit Intangibles	3,280
Right of Use Asset	9,993
Other assets	22,300
Total	896,348
Liabilities assumed:
Non-interest bearing	169,496
Interest-bearing	685,393
Mortgagors' escrow deposits	6,406
Borrowed funds	21,215
Operating lease liability	11,039
Other liabilities	3,108
Total	896,657
Goodwill recorded	$ 1,509
Common stock issued	32,705