LOANS AND ALLOWANCE FOR CREDIT LOSSES - Troubled Debt Restructurings (TDRs) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2023 USD ($) loan	Dec. 31, 2022 USD ($) loan
LOANS AND ALLOWANCE FOR CREDIT LOSSES
TDRs, number | loan	194	232
TDRs, amount	$ 5,629	$ 8,239
Loans modified in TDR during the year, number	24	54
Loans modified in TDR during the year, amount	$ 784	$ 3,087
Business lending loans	$ 500
Nonaccrual
LOANS AND ALLOWANCE FOR CREDIT LOSSES
TDRs, number | loan	62	81
TDRs, amount	$ 2,461	$ 3,940
Accruing
LOANS AND ALLOWANCE FOR CREDIT LOSSES
TDRs, number | loan	132	151
TDRs, amount	$ 3,168	$ 4,299
Consumer mortgage
LOANS AND ALLOWANCE FOR CREDIT LOSSES
TDRs, number | loan		108
TDRs, amount		$ 5,114
Consumer mortgage | Nonaccrual
LOANS AND ALLOWANCE FOR CREDIT LOSSES
TDRs, number | loan		61
TDRs, amount		$ 2,694
Consumer mortgage | Accruing
LOANS AND ALLOWANCE FOR CREDIT LOSSES
TDRs, number | loan		47
TDRs, amount		$ 2,420
Consumer indirect
LOANS AND ALLOWANCE FOR CREDIT LOSSES
TDRs, number | loan		72
TDRs, amount		$ 829
Consumer indirect | Nonaccrual
LOANS AND ALLOWANCE FOR CREDIT LOSSES
TDRs, number | loan		0
TDRs, amount		$ 0
Consumer indirect | Accruing
LOANS AND ALLOWANCE FOR CREDIT LOSSES
TDRs, number | loan		72
TDRs, amount		$ 829
Consumer direct
LOANS AND ALLOWANCE FOR CREDIT LOSSES
TDRs, number | loan		16
TDRs, amount		$ 7
Consumer direct | Nonaccrual
LOANS AND ALLOWANCE FOR CREDIT LOSSES
TDRs, number | loan		0
TDRs, amount		$ 0
Consumer direct | Accruing
LOANS AND ALLOWANCE FOR CREDIT LOSSES
TDRs, number | loan		16
TDRs, amount		$ 7
Home equity
LOANS AND ALLOWANCE FOR CREDIT LOSSES
TDRs, number | loan		22
TDRs, amount		$ 467
Home equity | Nonaccrual
LOANS AND ALLOWANCE FOR CREDIT LOSSES
TDRs, number | loan		10
TDRs, amount		$ 235
Home equity | Accruing
LOANS AND ALLOWANCE FOR CREDIT LOSSES
TDRs, number | loan		12
TDRs, amount		$ 232
Commercial Portfolio Segment | CRE - owner occupied
LOANS AND ALLOWANCE FOR CREDIT LOSSES
TDRs, number | loan		7
TDRs, amount		$ 1,396
Loans modified in TDR during the year, number | loan	0	5
Loans modified in TDR during the year, amount	$ 0	$ 1,371
Commercial Portfolio Segment | CRE - owner occupied | Nonaccrual
LOANS AND ALLOWANCE FOR CREDIT LOSSES
TDRs, number | loan		6
TDRs, amount		$ 711
Commercial Portfolio Segment | CRE - owner occupied | Accruing
LOANS AND ALLOWANCE FOR CREDIT LOSSES
TDRs, number | loan		1
TDRs, amount		$ 685
Residential Portfolio Segment | Consumer mortgage
LOANS AND ALLOWANCE FOR CREDIT LOSSES
TDRs, number | loan	98
TDRs, amount	$ 4,332
Loans modified in TDR during the year, number | loan	7	24
Loans modified in TDR during the year, amount	$ 597	$ 1,425
Residential Portfolio Segment | Consumer mortgage | Nonaccrual
LOANS AND ALLOWANCE FOR CREDIT LOSSES
TDRs, number | loan	52
TDRs, amount	$ 2,218
Residential Portfolio Segment | Consumer mortgage | Accruing
LOANS AND ALLOWANCE FOR CREDIT LOSSES
TDRs, number | loan	46
TDRs, amount	$ 2,114
Consumer Portfolio Segment | Consumer indirect
LOANS AND ALLOWANCE FOR CREDIT LOSSES
TDRs, number | loan	56
TDRs, amount	$ 600
Loans modified in TDR during the year, number | loan	13	23
Loans modified in TDR during the year, amount	$ 178	$ 284
Consumer Portfolio Segment | Consumer indirect | Nonaccrual
LOANS AND ALLOWANCE FOR CREDIT LOSSES
TDRs, number | loan	0
TDRs, amount	$ 0
Consumer Portfolio Segment | Consumer indirect | Accruing
LOANS AND ALLOWANCE FOR CREDIT LOSSES
TDRs, number | loan	56
TDRs, amount	$ 600
Consumer Portfolio Segment | Consumer direct
LOANS AND ALLOWANCE FOR CREDIT LOSSES
TDRs, number | loan	18
TDRs, amount	$ 5
Loans modified in TDR during the year, number | loan	3	2
Loans modified in TDR during the year, amount	$ 5	$ 7
Consumer Portfolio Segment | Consumer direct | Nonaccrual
LOANS AND ALLOWANCE FOR CREDIT LOSSES
TDRs, number | loan	0
TDRs, amount	$ 0
Consumer Portfolio Segment | Consumer direct | Accruing
LOANS AND ALLOWANCE FOR CREDIT LOSSES
TDRs, number | loan	18
TDRs, amount	$ 5
Consumer Portfolio Segment | Home equity
LOANS AND ALLOWANCE FOR CREDIT LOSSES
TDRs, number | loan	18
TDRs, amount	$ 286
Loans modified in TDR during the year, number | loan	1	0
Loans modified in TDR during the year, amount	$ 4	$ 0
Consumer Portfolio Segment | Home equity | Nonaccrual
LOANS AND ALLOWANCE FOR CREDIT LOSSES
TDRs, number | loan	9
TDRs, amount	$ 108
Consumer Portfolio Segment | Home equity | Accruing
LOANS AND ALLOWANCE FOR CREDIT LOSSES
TDRs, number | loan	9
TDRs, amount	$ 178