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LOANS (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016
Classifications of loans
Total loans	$ 3,175,776		$ 3,098,253
Net deferred loan costs and fees	4,900		4,499
Total loans held for investment	3,180,676		3,102,752
Allowance for loan losses	(31,652)	$ (32,812)	(31,707)	$ (27,544)	$ (26,618)	$ (25,904)
Loans, net	3,149,024		3,071,045
Commercial real estate \| Mortgage loans
Classifications of loans
Total loans	1,327,947		1,293,906
Allowance for loan losses	(11,206)	(11,334)	(11,048)	(10,579)	(8,357)	(9,225)
Multi-family \| Mortgage loans
Classifications of loans
Total loans	570,670		595,280
Allowance for loan losses	(2,466)	(3,002)	(4,521)	(4,846)	(6,480)	(6,264)
Residential real estate \| Mortgage loans
Classifications of loans
Total loans	510,303		464,264
Allowance for loan losses	(4,237)	(3,495)	(2,438)	(1,486)	(1,415)	(1,495)
Commercial, industrial and agricultural loans
Classifications of loans
Total loans	629,906		616,003
Allowance for loan losses	(12,358)	(14,055)	(12,838)	(9,970)	(9,198)	(7,837)
Real estate construction and land loans
Classifications of loans
Total loans	116,899		107,759
Allowance for loan losses	(1,263)	(821)	(740)	(577)	(1,058)	(955)
Installment/consumer loans
Classifications of loans
Total loans	20,051		21,041
Allowance for loan losses	$ (122)	$ (105)	$ (122)	$ (86)	$ (110)	$ (128)