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ALLOWANCE FOR CREDIT LOSSES - LOANS - Allowance for credit losses by loan portfolio segment (Details) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Jan. 01, 2023	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses - Loans	$ 15,053,000	$ 15,053,000	$ 10,743,000	$ 12,398,000	$ 11,947,000	$ 11,345,000
Charge-Offs		(3,641,000)	(1,849,000)	(294,000)
Recoveries		184,000	144,000	247,000
Provision (Credit)		6,563,000	50,000	1,100,000
ASU 2016-13
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses - Loans	1,200,000	1,200,000			1,200,000
Impact of adopting ASU 2016-13 | ASU 2016-13
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses - Loans	(1,204,000)	(1,204,000)
Other commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses - Loans	3,030,000	3,030,000			2,908,000
Charge-Offs		(480,000)
Recoveries		3,000
Provision (Credit)		599,000
Other commercial and industrial | Impact of adopting ASU 2016-13 | ASU 2016-13
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses - Loans	(2,908,000)	(2,908,000)
Other commercial real estate (non-owner occupied)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses - Loans	3,428,000	3,428,000			3,196,000
Charge-Offs	(804,000)
Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses - Loans	1,021,000	1,021,000	1,380,000	1,590,000	1,025,000
Charge-Offs		(54,000)	(28,000)
Recoveries		14,000	19,000
Provision (Credit)		36,000	(201,000)
Residential mortgage | Impact of adopting ASU 2016-13 | ASU 2016-13
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses - Loans	355,000	355,000
Allocation for general risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses - Loans			653,000	1,232,000		1,093,000
Charge-Offs		0
Provision (Credit)			(579,000)	139,000
Allocation for general risk | Impact of adopting ASU 2016-13 | ASU 2016-13
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses - Loans	653,000	653,000
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-Offs		(3,312,000)
Commercial | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses - Loans			2,653,000	3,071,000		3,472,000
Charge-Offs			(97,000)	(146,000)
Recoveries			4,000	89,000
Provision (Credit)			(325,000)	(344,000)
Commercial | Commercial real estate (owner occupied)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses - Loans	1,529,000	1,529,000			1,380,000
Charge-Offs		0
Recoveries		24,000
Provision (Credit)		125,000
Commercial | Commercial real estate (owner occupied) | Impact of adopting ASU 2016-13 | ASU 2016-13
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses - Loans	(1,380,000)	(1,380,000)
Commercial | Other commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses - Loans	3,030,000	3,030,000
Charge-Offs	(405,000)	(480,000)
Commercial | Commercial real estate (non-owner occupied)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses - Loans			5,972,000	6,392,000		5,373,000
Charge-Offs			(1,390,000)
Recoveries			54,000	51,000
Provision (Credit)			916,000	968,000
Commercial | Commercial real estate (non-owner occupied) - retail
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses - Loans	3,488,000	3,488,000			1,432,000
Charge-Offs		(2,028,000)
Provision (Credit)		4,084,000
Commercial | Commercial real estate (non-owner occupied) - retail | Impact of adopting ASU 2016-13 | ASU 2016-13
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses - Loans	(1,432,000)	(1,432,000)
Commercial | Commercial real estate (non-owner occupied) - multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses - Loans	1,430,000	1,430,000			1,226,000
Charge-Offs		0
Recoveries		6,000
Provision (Credit)		198,000
Commercial | Commercial real estate (non-owner occupied) - multi-family | Impact of adopting ASU 2016-13 | ASU 2016-13
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses - Loans	(1,226,000)	(1,226,000)
Commercial | Other commercial real estate (non-owner occupied)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses - Loans	3,428,000	3,428,000	5,972,000
Charge-Offs		(804,000)
Recoveries		14,000
Provision (Credit)		1,022,000
Commercial | Other commercial real estate (non-owner occupied) | Impact of adopting ASU 2016-13 | ASU 2016-13
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses - Loans	2,776,000	2,776,000
Commercial | Commercial (owner occupied real estate and other)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses - Loans			2,653,000
Charge-Offs		0
Commercial | Commercial (owner occupied real estate and other) | Impact of adopting ASU 2016-13 | ASU 2016-13
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses - Loans	2,653,000	2,653,000
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Charge-Offs		(329,000)
Consumer | Commercial real estate (non-owner occupied) - retail
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses - Loans	3,488,000	3,488,000
Consumer | Commercial real estate (non-owner occupied) - multi-family
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses - Loans	1,430,000	1,430,000
Consumer | Residential mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses - Loans			1,380,000	1,590,000		1,292,000
Charge-Offs		(54,000)		(17,000)
Recoveries				49,000
Provision (Credit)				266,000
Consumer | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses - Loans	1,127,000	1,127,000	85,000	113,000	$ 780,000	$ 115,000
Charge-Offs		(275,000)	(334,000)	(131,000)
Recoveries		123,000	67,000	58,000
Provision (Credit)		499,000	$ 239,000	$ 71,000
Consumer | Consumer | Impact of adopting ASU 2016-13 | ASU 2016-13
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for credit losses - Loans	$ (695,000)	$ (695,000)

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Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

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Amount, excluding accrued interest, of increase in allowance for credit loss on financing receivable from recovery. Excludes net investment in lease.

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