Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 42,668	$ 35,164
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	153	3,266
Depreciation and amortization of bank premises and equipment	4,328	3,493
Amortization of premium, net of accretion of discount	6,462	5,716
Net loss from fair value adjustments	537	2,834
Net gain from sale of loans	(168)	(396)
Net loss from sale of securities		186
Net gain from sale of OREO	(27)	(50)
Income from bank owned life insurance	(2,320)	(2,418)
Gain from life insurance proceeds	(2,998)	(1,405)
Stock-based compensation expense	5,973	5,092
Deferred compensation	(2,450)	(3,322)
Deferred income tax benefit	(1,437)	(1,806)
Increase in other liabilities	6,580	6,810
Decrease (increase) in other assets	2,103	(68)
Net cash provided by operating activities	59,404	53,096
CASH FLOWS FROM INVESTING ACTIVITIES
Purchases of bank premises and equipment	(3,421)	(5,321)
Net redemptions of Federal Home Loan Bank of New York shares	5,147	3,945
Purchases of securities held-to-maturity	(653)	(8,030)
Proceeds from maturities and prepayments of securities held-to-maturity	364	14,830
Purchases of securities available for sale	(102,756)	(152,121)
Proceeds from sales and calls of securities available for sale	10,000	155,999
Proceeds from maturities and prepayments of securities available for sale	57,839	60,573
Proceeds from bank owned life insurance	6,165	4,646
Net repayments (originations) of loans	3,605	(234,227)
Purchases of loans	(235,193)	(75,832)
Proceeds from sale of real estate owned	665	583
Proceeds from sale of loans	14,410	54,990
Net cash used in investing activities	(243,828)	(179,965)
CASH FLOWS FROM FINANCING ACTIVITIES
Net increase in non-interest bearing deposits	13,337	29,346
Net increase in interest-bearing deposits	303,288	195,552
Net increase in mortgagors' escrow deposits	16,061	13,455
Net proceeds (repayments) from short-term borrowed funds	115,250	(43,500)
Proceeds from long-term borrowings	25,000	180,000
Repayment of long-term borrowings	(256,088)	(205,049)
Purchases of treasury stock	(21,638)	(2,902)
Proceeds from issuance of common stock upon exercise of stock options	6
Cash dividends paid	(17,244)	(15,729)
Net cash provided by financing activities	177,972	151,173
Net (decrease) increase in cash and cash equivalents	(6,452)	24,304
Cash and cash equivalents, beginning of period	51,546	35,857
Cash and cash equivalents, end of period	45,094	60,161
SUPPLEMENTAL CASH FLOW DISCLOSURE
Interest paid	57,811	42,543
Income taxes paid	5,116	16,906
Taxes paid if excess tax benefits were not tax deductible	5,753	16,906
Non-cash activities:
Loans transferred to Other Real Estate Owned or Other Assets	673
Reclassification of the Income tax effects of Tax Cuts and Jobs Act from AOCI to Retained Earnings	2,073
Loans held for investment transferred to loans available for sale		30,565
Securities purchased not yet settled	$ 10,000