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LOANS (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2015
Classifications of loans
Total loans	$ 2,917,263		$ 2,596,205
Net deferred loan costs and fees	4,442		4,235
Total loans held for investment	2,921,705		2,600,440
Allowance for loan losses	(29,273)	$ (27,544)	(25,904)	$ (24,308)	$ (22,708)	$ (20,744)
Loans, net	2,892,432		2,574,536
Commercial real estate \| Mortgage loans
Classifications of loans
Total loans	1,261,369		1,091,752
Allowance for loan losses	(10,470)	(10,579)	(9,225)	(8,460)	(8,309)	(7,850)
Multi-family \| Mortgage loans
Classifications of loans
Total loans	570,181		518,146
Allowance for loan losses	(4,840)	(4,846)	(6,264)	(6,580)	(5,287)	(4,208)
Residential real estate \| Mortgage loans
Classifications of loans
Total loans	400,256		364,884
Allowance for loan losses	(1,660)	(1,486)	(1,495)	(2,031)	(2,076)	(2,115)
Commercial, industrial and agricultural loans
Classifications of loans
Total loans	572,393		524,450
Allowance for loan losses	(11,424)	(9,970)	(7,837)	(6,207)	(5,771)	(5,405)
Real estate construction and land loans
Classifications of loans
Total loans	93,393		80,605
Allowance for loan losses	(745)	(577)	(955)	(912)	(1,131)	(1,030)
Installment/consumer loans
Classifications of loans
Total loans	19,671		16,368
Allowance for loan losses	$ (134)	$ (86)	$ (128)	$ (118)	$ (134)	$ (136)