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LOANS - Troubled Debt Restructurings (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($) loan	Sep. 30, 2020 USD ($) loan	Sep. 30, 2021 USD ($) loan	Sep. 30, 2020 USD ($) loan
Troubled Debt Restructurings
Troubled debt restructurings, number of contracts | loan	1	5	4	7
Troubled debt restructurings, post-modification recorded investment | $	$ 70	$ 7,001	$ 222	$ 7,271
Commercial | Real estate loan | Principal and interest payment deferral non-COVID related
Troubled Debt Restructurings
Troubled debt restructurings, number of contracts | loan	0	2	0	2
Troubled debt restructurings, post-modification recorded investment | $	$ 0	$ 4,831	$ 0	$ 4,831
Commercial | Real estate loan | Interest only payments for a nine-month period
Troubled Debt Restructurings
Troubled debt restructurings, number of contracts | loan			0	1
Troubled debt restructurings, post-modification recorded investment | $			$ 0	$ 240
Commercial | Multi-family (5 or more) residential | Principal and interest payment deferral non-COVID related
Troubled Debt Restructurings
Troubled debt restructurings, number of contracts | loan	0	3	0	3
Troubled debt restructurings, post-modification recorded investment | $	$ 0	$ 2,170	$ 0	$ 2,170
Residential mortgage | Real estate loan | first liens | Reduced monthly payments for a fifteen-month period
Troubled Debt Restructurings
Troubled debt restructurings, number of contracts | loan			1	0
Troubled debt restructurings, post-modification recorded investment | $			$ 116	$ 0
Residential mortgage | Real estate loan | first liens | Reduced monthly payments and extended maturity date
Troubled Debt Restructurings
Troubled debt restructurings, number of contracts | loan			1	0
Troubled debt restructurings, post-modification recorded investment | $			$ 12	$ 0
Residential mortgage | Real estate loan | junior liens | New loan at lower than risk-adjusted market rate to borrower from whom short sale of other collateral was accepted
Troubled Debt Restructurings
Troubled debt restructurings, number of contracts | loan			0	1
Troubled debt restructurings, post-modification recorded investment | $			$ 0	$ 30
Residential mortgage | Home equity lines of credit | Reduced monthly payments and extended maturity date
Troubled Debt Restructurings
Troubled debt restructurings, number of contracts | loan			1	0
Troubled debt restructurings, post-modification recorded investment | $			$ 24	$ 0
Residential mortgage | Home equity lines of credit | Reduced monthly payments for eighteen-month period
Troubled Debt Restructurings
Troubled debt restructurings, number of contracts | loan	1	0	1	0
Troubled debt restructurings, post-modification recorded investment | $	$ 70	$ 0	$ 70	$ 0

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Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524

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Amount, after troubled debt restructuring, of modified financing receivable.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524

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