LOANS - Impaired Loans (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Recorded Investment
With no related allowance recorded	$ 5,217		$ 5,217		$ 5,129
With an allowance recorded	886		886		2,509
Total	6,103		6,103		7,638
Unpaid Principal Balance
With no related allowance recorded	6,328		6,328		5,533
With an allowance recorded	882		882		2,484
Total	7,210		7,210		8,017
Related Allowance	25		25		815
Average Recorded Investment
With no related allowance recorded	5,254	$ 14,518	5,292	$ 8,590
With an allowance recorded	890	919	1,377	1,145
Total	6,144	15,437	6,669	9,735
Interest Income
With no related allowance recorded	26	57	87	164
With an allowance recorded	10	12	30	36
Total	36	69	117	200
Cash Basis Interest
With no related allowance recorded	22	27	73	64
With an allowance recorded	0	0	0	0
Total	22	27	73	64
Multifamily residential
Recorded Investment
With no related allowance recorded	528		528		541
Total	528		528		541
Unpaid Principal Balance
With no related allowance recorded	605		605		618
Total	605		605		618
Related Allowance	0		0		0
Average Recorded Investment
With no related allowance recorded	530	7,121	535	3,182
Total	530	7,121	535	3,182
Interest Income
With no related allowance recorded	8	9	25	21
Total	8	9	25	21
Cash Basis Interest
With no related allowance recorded	8	9	25	21
Total	8	9	25	21
Single family residential
Recorded Investment
With no related allowance recorded	4,689		4,689		4,588
With an allowance recorded	886		886		2,509
Total	5,575		5,575		7,097
Unpaid Principal Balance
With no related allowance recorded	5,723		5,723		4,915
With an allowance recorded	882		882		2,484
Total	6,605		6,605		7,399
Related Allowance	25		25		$ 815
Average Recorded Investment
With no related allowance recorded	4,724	7,397	4,757	5,408
With an allowance recorded	890	919	1,377	1,145
Total	5,614	8,316	6,134	6,553
Interest Income
With no related allowance recorded	18	48	62	143
With an allowance recorded	10	12	30	36
Total	28	60	92	179
Cash Basis Interest
With no related allowance recorded	14	18	48	43
With an allowance recorded	0	0	0	0
Total	$ 14	$ 18	$ 48	$ 43