LOANS AND ALLOWANCE FOR CREDIT LOSSES - Troubled Debt Restructuring (TDR) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) loan	Dec. 31, 2022 USD ($) loan
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | loan	194	232
Financing Receivable, Troubled Debt Restructuring	$ 5,629	$ 8,239
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 784	$ 3,087
Nonaccrual [Member]
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | loan	62	81
Financing Receivable, Troubled Debt Restructuring	$ 2,461	$ 3,940
Accruing [Member]
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | loan	132	151
Financing Receivable, Troubled Debt Restructuring	$ 3,168	$ 4,299
Consumer mortgage
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | loan		108
Financing Receivable, Troubled Debt Restructuring		$ 5,114
Consumer mortgage | Nonaccrual [Member]
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | loan		61
Financing Receivable, Troubled Debt Restructuring		$ 2,694
Consumer mortgage | Accruing [Member]
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | loan		47
Financing Receivable, Troubled Debt Restructuring		$ 2,420
Consumer indirect
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | loan		72
Financing Receivable, Troubled Debt Restructuring		$ 829
Consumer indirect | Nonaccrual [Member]
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | loan		0
Financing Receivable, Troubled Debt Restructuring		$ 0
Consumer indirect | Accruing [Member]
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | loan		72
Financing Receivable, Troubled Debt Restructuring		$ 829
Consumer direct
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | loan		16
Financing Receivable, Troubled Debt Restructuring		$ 7
Consumer direct | Nonaccrual [Member]
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | loan		0
Financing Receivable, Troubled Debt Restructuring		$ 0
Consumer direct | Accruing [Member]
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | loan		16
Financing Receivable, Troubled Debt Restructuring		$ 7
Home equity
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | loan		22
Financing Receivable, Troubled Debt Restructuring		$ 467
Home equity | Nonaccrual [Member]
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | loan		10
Financing Receivable, Troubled Debt Restructuring		$ 235
Home equity | Accruing [Member]
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | loan		12
Financing Receivable, Troubled Debt Restructuring		$ 232
Residential Portfolio Segment | Consumer mortgage
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | loan	98
Financing Receivable, Troubled Debt Restructuring	$ 4,332
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 597	$ 1,425
Residential Portfolio Segment | Consumer mortgage | Nonaccrual [Member]
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | loan	52
Financing Receivable, Troubled Debt Restructuring	$ 2,218
Residential Portfolio Segment | Consumer mortgage | Accruing [Member]
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | loan	46
Financing Receivable, Troubled Debt Restructuring	$ 2,114
Commercial Portfolio Segment | CRE - multifamily
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | loan	2	2
Financing Receivable, Troubled Debt Restructuring	$ 201	$ 211
Commercial Portfolio Segment | CRE - multifamily | Nonaccrual [Member]
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | loan	1	1
Financing Receivable, Troubled Debt Restructuring	$ 135	$ 135
Commercial Portfolio Segment | CRE - multifamily | Accruing [Member]
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | loan	1	1
Financing Receivable, Troubled Debt Restructuring	$ 66	$ 76
Commercial Portfolio Segment | CRE - owner occupied
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | loan		7
Financing Receivable, Troubled Debt Restructuring		$ 1,396
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 0	$ 1,371
Commercial Portfolio Segment | CRE - owner occupied | Nonaccrual [Member]
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | loan		6
Financing Receivable, Troubled Debt Restructuring		$ 711
Commercial Portfolio Segment | CRE - owner occupied | Accruing [Member]
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | loan		1
Financing Receivable, Troubled Debt Restructuring		$ 685
Commercial Portfolio Segment | Commercial & industrial and other business loans
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | loan	2	5
Financing Receivable, Troubled Debt Restructuring	$ 205	$ 215
Commercial Portfolio Segment | Commercial & industrial and other business loans | Nonaccrual [Member]
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | loan	0	3
Financing Receivable, Troubled Debt Restructuring	$ 0	$ 165
Commercial Portfolio Segment | Commercial & industrial and other business loans | Accruing [Member]
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | loan	2	2
Financing Receivable, Troubled Debt Restructuring	$ 205	$ 50
Consumer Portfolio Segment | Consumer indirect
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | loan	56
Financing Receivable, Troubled Debt Restructuring	$ 600
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 178	284
Consumer Portfolio Segment | Consumer indirect | Nonaccrual [Member]
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | loan	0
Financing Receivable, Troubled Debt Restructuring	$ 0
Consumer Portfolio Segment | Consumer indirect | Accruing [Member]
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | loan	56
Financing Receivable, Troubled Debt Restructuring	$ 600
Consumer Portfolio Segment | Consumer direct
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | loan	18
Financing Receivable, Troubled Debt Restructuring	$ 5
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 5	7
Consumer Portfolio Segment | Consumer direct | Nonaccrual [Member]
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | loan	0
Financing Receivable, Troubled Debt Restructuring	$ 0
Consumer Portfolio Segment | Consumer direct | Accruing [Member]
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | loan	18
Financing Receivable, Troubled Debt Restructuring	$ 5
Consumer Portfolio Segment | Home equity
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | loan	18
Financing Receivable, Troubled Debt Restructuring	$ 286
Financing Receivable, Troubled Debt Restructuring, Postmodification	$ 4	$ 0
Consumer Portfolio Segment | Home equity | Nonaccrual [Member]
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | loan	9
Financing Receivable, Troubled Debt Restructuring	$ 108
Consumer Portfolio Segment | Home equity | Accruing [Member]
Troubled Debt Restructurings (TDRs) [Abstract]
TDRs, number | loan	9
Financing Receivable, Troubled Debt Restructuring	$ 178