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LOANS (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015
Classifications of loans
Total loans	$ 2,791,617		$ 2,596,205
Net deferred loan costs and fees	4,692		4,235
Loans	2,796,309		2,600,440
Allowance for loan losses	(27,544)	$ (26,618)	(25,904)	$ (22,708)	$ (21,799)	$ (20,744)
Loans, net	2,768,765		2,574,536
Commercial real estate \| Mortgage loans
Classifications of loans
Total loans	1,191,848		1,091,752
Allowance for loan losses	(10,579)	(8,357)	(9,225)	(8,309)	(8,029)	(7,850)
Multi-family \| Mortgage loans
Classifications of loans
Total loans	547,101		518,146
Allowance for loan losses	(4,846)	(6,480)	(6,264)	(5,287)	(4,669)	(4,208)
Residential real estate \| Mortgage loans
Classifications of loans
Total loans	383,008		364,884
Allowance for loan losses	(1,486)	(1,415)	(1,495)	(2,076)	(2,115)	(2,115)
Commercial, industrial and agricultural loans
Classifications of loans
Total loans	574,241		524,450
Allowance for loan losses	(9,970)	(9,198)	(7,837)	(5,771)	(5,568)	(5,405)
Real estate construction and land loans
Classifications of loans
Total loans	78,693		80,605
Allowance for loan losses	(577)	(1,058)	(955)	(1,131)	(1,277)	(1,030)
Installment/consumer loans
Classifications of loans
Total loans	16,726		16,368
Allowance for loan losses	$ (86)	$ (110)	$ (128)	$ (134)	$ (141)	$ (136)