LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES - Non-accrual loans (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Financing Receivable Nonaccrual Status [Roll Forward]
Balance	$ 338	$ 4,512
Transfer into non-accrual	61	643
Loans paid down/payoffs	(148)	(598)
Loans return to accrual status		(33)
Loans charged off	(49)	(82)
Balance	202	4,442
Real Estate Loan
Financing Receivable Nonaccrual Status [Roll Forward]
Balance	123
Balance	82
Commercial and Industrial
Financing Receivable Nonaccrual Status [Roll Forward]
Balance	71
Consumer Loans
Financing Receivable Nonaccrual Status [Roll Forward]
Balance	144
Single-family | Real Estate Loan
Financing Receivable Nonaccrual Status [Roll Forward]
Balance	123	270
Loans paid down/payoffs	(41)	(133)
Balance	82	137
Commercial | Real Estate Loan
Financing Receivable Nonaccrual Status [Roll Forward]
Balance		4,029
Transfer into non-accrual		574
Loans paid down/payoffs		(437)
Balance		4,166
Commercial | Consumer Loans
Financing Receivable Nonaccrual Status [Roll Forward]
Balance	120
SBA Guaranty | Commercial and Industrial
Financing Receivable Nonaccrual Status [Roll Forward]
Balance	71
Loans paid down/payoffs	(61)
Loans charged off	(10)
Consumer and Indirect | Consumer Loans
Financing Receivable Nonaccrual Status [Roll Forward]
Balance		34
Loans paid down/payoffs		(1)
Loans return to accrual status		(33)
Automobile | Consumer Loans
Financing Receivable Nonaccrual Status [Roll Forward]
Balance	144	179
Transfer into non-accrual	61	69
Loans paid down/payoffs	(46)	(27)
Loans charged off	(39)	(82)
Balance	$ 120	$ 139