LOANS AND ALLOWANCE FOR LOAN LOSSES (Schedule of Past Due Loans) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 10,618	$ 3,086
Loans not Past Due	2,490,751	1,864,263
Total loans	2,501,369	1,867,349
30 - 59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	5,652	2,659
60 - 89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	252	138
Greater than 90 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	4,714	289
Real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total loans	1,972,956	1,378,867
Real estate | Commercial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,598	0
Loans not Past Due	1,502,939	949,778
Total loans	1,505,537	949,778
Real estate | Commercial | 30 - 59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,598	0
Real estate | Commercial | 60 - 89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Real estate | Commercial | Greater than 90 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Real estate | Construction
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Loans not Past Due	37,986	42,540
Total loans	37,986	42,540
Real estate | Construction | 30 - 59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Real estate | Construction | 60 - 89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Real estate | Construction | Greater than 90 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Real estate | Multifamily
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Loans not Past Due	360,346	307,126
Total loans	360,346	307,126
Real estate | Multifamily | 30 - 59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Real estate | Multifamily | 60 - 89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Real estate | Multifamily | Greater than 90 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Real estate | One to four family
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,357	870
Loans not Past Due	66,730	78,553
Total loans	69,087	79,423
Real estate | One to four family | 30 - 59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	870
Real estate | One to four family | 60 - 89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	0	0
Real estate | One to four family | Greater than 90 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,357	0
Commercial and industrial
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	4,283	2,004
Loans not Past Due	445,142	379,688
Total loans	449,425	381,692
Commercial and industrial | 30 - 59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	2,413	1,670
Commercial and industrial | 60 - 89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	107	95
Commercial and industrial | Greater than 90 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,763	239
Consumer
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	1,380	212
Loans not Past Due	77,608	106,578
Total loans	78,988	106,790
Consumer | 30 - 59 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	641	119
Consumer | 60 - 89 Days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	145	43
Consumer | Greater than 90 days
Financing Receivable, Recorded Investment, Past Due [Line Items]
Total Past Due	$ 594	$ 50