LOANS AND ALLOWANCE FOR LOAN LOSSES (Schedule of Loans by Risk Category) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	$ 2,105,284	$ 1,867,349
Commercial Construction and Multifamily Real Estate Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	1,929,447	1,681,136
Commercial Construction and Multifamily Real Estate Loans [Member] | Pass
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	1,928,024	1,679,257
Commercial Construction and Multifamily Real Estate Loans [Member] | Special Mention
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	379	1,879
Commercial Construction and Multifamily Real Estate Loans [Member] | Substandard
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	1,044
Real estate
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	1,586,887	1,378,867
Real estate | Commercial
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	1,134,243	949,778
Real estate | Commercial | Pass
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	1,133,864	949,395
Real estate | Commercial | Special Mention
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	379	383
Real estate | Construction
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	46,245	42,540
Real estate | Construction | Pass
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	46,245	42,540
Real estate | Multifamily
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	327,456	307,126
Real estate | Multifamily | Pass
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	327,456	307,126
Real estate | One to four family
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	78,943	79,423
Commercial and industrial
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	421,503	381,692
Commercial and industrial | Pass
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	420,459	380,196
Commercial and industrial | Special Mention
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross		1,496
Commercial and industrial | Substandard
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	1,044
Consumer
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	$ 96,894	$ 106,790