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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Nonaccrual Loans and Leases Additional Information (Details)	3 Months Ended			9 Months Ended
	Sep. 30, 2021 USD ($) loan	Jun. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) loan	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($) loan
Financing Receivable, Past Due [Line Items]
Loans 90 days past due and still accruing	$ 0			$ 0		$ 728,000
Loans on non-accrual status	45,621,000			45,621,000		35,900,000
Transfer from loans to other real estate owned, net				3,253,000	$ 1,116,000
Loans sold	0		$ 0	0	0
Net gain on sale of loans	0	$ 0	272,000	0	245,000
Single family residential mortgage
Financing Receivable, Past Due [Line Items]
Other real estate owned, net	0			0		0
Transfer from loans to other real estate owned, net	1,000		1,000	1,000	1,000
Loans sold	3,300,000		1,100,000	3,300,000	1,100,000
Net gain on sale of loans	365,000		$ 38,000	365,000	$ 38,000
Consumer | Single family residential mortgage
Financing Receivable, Past Due [Line Items]
Loans on non-accrual status	$ 16,544,000			$ 16,544,000		$ 13,519,000
Number of loans in process of foreclosure | loan	1			1		0
Loans in process of foreclosure	$ 2,500,000			$ 2,500,000		$ 0
NTM Loans
Financing Receivable, Past Due [Line Items]
Loans on non-accrual status	6,644,000			6,644,000		8,697,000
NTM Loans | Consumer | Single family residential mortgage
Financing Receivable, Past Due [Line Items]
Loans on non-accrual status	6,644,000			6,644,000		8,697,000
NTM Loans | Green Loans | Non-performing Loans | Consumer
Financing Receivable, Past Due [Line Items]
Loans on non-accrual status	3,300,000			3,300,000		4,000,000
Green Loans (HELOC) - first liens | NTM Loans | Interest Only Loans | Non-performing Loans | Consumer
Financing Receivable, Past Due [Line Items]
Loans on non-accrual status	$ 3,300,000			$ 3,300,000		$ 4,700,000

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