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LOANS - Major Classifications of Loans (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016
Classifications of loans
Total loans	$ 3,191,408		$ 3,098,253
Net deferred loan costs and fees	6,019		4,499
Total loans held for investment	3,197,427		3,102,752
Allowance for loan losses	(31,869)	$ (31,652)	(31,707)	$ (29,273)	$ (27,544)	$ (25,904)
Loans, net	3,165,558		3,071,045
Commercial Real Estate \| Mortgage loans
Classifications of loans
Total loans	1,348,569		1,293,906
Allowance for loan losses	(11,409)	(11,206)	(11,048)	(10,470)	(10,579)	(9,225)
Multi-family \| Mortgage loans
Classifications of loans
Total loans	579,827		595,280
Allowance for loan losses	(2,793)	(2,466)	(4,521)	(4,840)	(4,846)	(6,264)
Residential real estate \| Mortgage loans
Classifications of loans
Total loans	516,995		464,264
Allowance for loan losses	(4,443)	(4,237)	(2,438)	(1,660)	(1,486)	(1,495)
Commercial and industrial
Classifications of loans
Total loans	608,723		616,003
Allowance for loan losses	(11,808)	(12,358)	(12,838)	(11,424)	(9,970)	(7,837)
Real estate construction and land loans
Classifications of loans
Total loans	118,137		107,759
Allowance for loan losses	(1,301)	(1,263)	(740)	(745)	(577)	(955)
Installment/consumer loans
Classifications of loans
Total loans	19,157		21,041
Allowance for loan losses	$ (115)	$ (122)	$ (122)	$ (134)	$ (86)	$ (128)