LOANS AND ALLOWANCE FOR LOAN LOSSES (Schedule of Loans by Risk Category) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	$ 2,994,798	$ 2,677,919
Commercial Construction and Multifamily Real Estate Loans [Member]
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	2,879,791	2,523,293
Commercial Construction and Multifamily Real Estate Loans [Member] | Pass
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	2,874,916	2,520,919
Commercial Construction and Multifamily Real Estate Loans [Member] | Special Mention
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	363	367
Commercial Construction and Multifamily Real Estate Loans [Member] | Substandard
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross		960
Commercial Construction and Multifamily Real Estate Loans [Member] | Doubtful
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	4,512	1,047
Receivables other than one to four family and consumer loans
Loans and Leases Receivable Disclosure [Line Items]
Minimum threshold amount taken as base for credit indicator analysis	500
Real estate
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	2,415,316	2,157,344
Real estate | Commercial
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	1,842,969	1,668,236
Real estate | Commercial | Pass
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	1,842,606	1,667,869
Real estate | Commercial | Special Mention
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	363	367
Real estate | Construction
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	100,957	30,827
Real estate | Construction | Pass
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	100,957	30,827
Real estate | Multi-family
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	407,802	375,611
Real estate | Multi-family | Pass
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	407,802	375,611
Real estate | One to four family
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	63,588	82,670
Commercial and industrial
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	528,063	448,619
Commercial and industrial | Pass
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	523,551	446,612
Commercial and industrial | Substandard
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross		960
Commercial and industrial | Doubtful
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	4,512	1,047
Commercial and industrial | Commercial
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	528,063	448,619
Consumer
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	51,419	71,956
Consumer | Consumer
Loans and Leases Receivable Disclosure [Line Items]
Loans and Leases Receivable, Gross	$ 51,419	$ 71,956