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ALLOWANCE FOR CREDIT LOSSES - LOANS - Commercial and commercial real estate loan portfolios (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]        
Total $ 1,038,271,000 $ 1,038,271,000 $ 990,766,000  
Current period gross charge-offs, Total   3,641,000 1,849,000 $ 294,000
Loan portfolio     990,766,000  
Other commercial and industrial        
Financing Receivable, Credit Quality Indicator [Line Items]        
Total 159,424,000 159,424,000    
Current period gross charge-offs, Total   480,000    
Commercial real estate (non-owner occupied) - multi-family        
Financing Receivable, Credit Quality Indicator [Line Items]        
Total 110,008,000 110,008,000    
Other commercial real estate (non-owner occupied)        
Financing Receivable, Credit Quality Indicator [Line Items]        
Total 240,286,000 240,286,000    
Current period gross charge-offs, Total 804,000      
Residential mortgage        
Financing Receivable, Credit Quality Indicator [Line Items]        
Total 174,670,000 174,670,000 297,971,000  
Current period gross charge-offs, Total   54,000 28,000  
Loan portfolio     297,971,000  
Commercial        
Financing Receivable, Credit Quality Indicator [Line Items]        
2023 128,219,000 128,219,000    
2022 120,075,000 120,075,000    
2021 126,424,000 126,424,000    
2020 70,567,000 70,567,000    
2019 66,896,000 66,896,000    
PRIOR 182,673,000 182,673,000    
REVOLVING LOANS AMORTIZED COST BASIS 65,703,000 65,703,000    
REVOLVING LOANS CONVERTED TO TERM 269,000 269,000    
Total 760,826,000 760,826,000    
Current period gross charge-offs, 2022   75,000    
Current period gross charge-offs, 2019   804,000    
Current period gross charge-offs, Prior   2,433,000    
Current period gross charge-offs, Total   3,312,000    
Loan portfolio     679,322,000  
Commercial | Commercial and industrial        
Financing Receivable, Credit Quality Indicator [Line Items]        
Total     153,398,000  
Loan portfolio     153,398,000  
Commercial | Commercial and industrial.        
Financing Receivable, Credit Quality Indicator [Line Items]        
Loan portfolio     153,398,000  
Commercial | Paycheck Protection Program (PPP)        
Financing Receivable, Credit Quality Indicator [Line Items]        
Total     22,000  
Commercial | Commercial real estate (owner occupied)        
Financing Receivable, Credit Quality Indicator [Line Items]        
2023 17,801,000 17,801,000    
2022 6,750,000 6,750,000    
2021 15,531,000 15,531,000    
2020 8,415,000 8,415,000    
2019 12,574,000 12,574,000    
PRIOR 26,802,000 26,802,000    
REVOLVING LOANS AMORTIZED COST BASIS 1,274,000 1,274,000    
Total 89,147,000 89,147,000 75,158,000  
Current period gross charge-offs, Total   0    
Loan portfolio     75,158,000  
Commercial | Other commercial and industrial        
Financing Receivable, Credit Quality Indicator [Line Items]        
2023 22,662,000 22,662,000    
2022 35,435,000 35,435,000    
2021 12,894,000 12,894,000    
2020 5,831,000 5,831,000    
2019 4,912,000 4,912,000    
PRIOR 21,165,000 21,165,000    
REVOLVING LOANS AMORTIZED COST BASIS 56,455,000 56,455,000    
REVOLVING LOANS CONVERTED TO TERM 70,000 70,000    
Total 159,424,000 159,424,000    
Current period gross charge-offs, 2022   75,000    
Current period gross charge-offs, Prior   405,000    
Current period gross charge-offs, Total 405,000 480,000    
Commercial | Commercial real estate (non-owner occupied)        
Financing Receivable, Credit Quality Indicator [Line Items]        
Total     450,744,000  
Current period gross charge-offs, Total     1,390,000  
Loan portfolio     450,744,000  
Commercial | Commercial real estate (non-owner occupied) - retail        
Financing Receivable, Credit Quality Indicator [Line Items]        
2023 35,545,000 35,545,000    
2022 23,682,000 23,682,000    
2021 33,110,000 33,110,000    
2020 23,146,000 23,146,000    
2019 9,226,000 9,226,000    
PRIOR 36,269,000 36,269,000    
REVOLVING LOANS AMORTIZED COST BASIS 983,000 983,000    
Total 161,961,000 161,961,000    
Current period gross charge-offs, Prior   2,028,000    
Current period gross charge-offs, Total   2,028,000    
Commercial | Commercial real estate (non-owner occupied) - multi-family        
Financing Receivable, Credit Quality Indicator [Line Items]        
2023 22,620,000 22,620,000    
2022 16,767,000 16,767,000    
2021 16,622,000 16,622,000    
2020 13,007,000 13,007,000    
2019 10,916,000 10,916,000    
PRIOR 28,755,000 28,755,000    
REVOLVING LOANS AMORTIZED COST BASIS 1,321,000 1,321,000    
Total 110,008,000 110,008,000    
Current period gross charge-offs, Total   0    
Commercial | Other commercial real estate (non-owner occupied)        
Financing Receivable, Credit Quality Indicator [Line Items]        
2023 29,591,000 29,591,000    
2022 37,441,000 37,441,000    
2021 48,267,000 48,267,000    
2020 20,168,000 20,168,000    
2019 29,268,000 29,268,000    
PRIOR 69,682,000 69,682,000    
REVOLVING LOANS AMORTIZED COST BASIS 5,670,000 5,670,000    
REVOLVING LOANS CONVERTED TO TERM 199,000 199,000    
Total 240,286,000 240,286,000    
Current period gross charge-offs, 2019   804,000    
Current period gross charge-offs, Total   804,000    
Consumer.        
Financing Receivable, Credit Quality Indicator [Line Items]        
2023 28,481,000 28,481,000    
2022 32,050,000 32,050,000    
2021 70,954,000 70,954,000    
2020 47,312,000 47,312,000    
2019 8,303,000 8,303,000    
PRIOR 40,956,000 40,956,000    
REVOLVING LOANS AMORTIZED COST BASIS 48,501,000 48,501,000    
REVOLVING LOANS CONVERTED TO TERM 888,000 888,000    
Total 277,445,000 277,445,000    
Current period gross charge-offs, 2023   9,000    
Current period gross charge-offs, 2022   35,000    
Current period gross charge-offs, 2021   43,000    
Current period gross charge-offs, 2020   7,000    
Current period gross charge-offs, 2019   8,000    
Current period gross charge-offs, Prior   227,000    
Current period gross charge-offs, Total   329,000    
Loan portfolio     311,444,000  
Consumer. | Residential mortgage        
Financing Receivable, Credit Quality Indicator [Line Items]        
2023 14,576,000 14,576,000    
2022 11,620,000 11,620,000    
2021 61,172,000 61,172,000    
2020 44,049,000 44,049,000    
2019 7,092,000 7,092,000    
PRIOR 36,161,000 36,161,000    
Total 174,670,000 174,670,000    
Current period gross charge-offs, Prior   54,000    
Current period gross charge-offs, Total   54,000   17,000
Loan portfolio     297,971,000  
Consumer. | Consumer        
Financing Receivable, Credit Quality Indicator [Line Items]        
2023 13,905,000 13,905,000    
2022 20,430,000 20,430,000    
2021 9,782,000 9,782,000    
2020 3,263,000 3,263,000    
2019 1,211,000 1,211,000    
PRIOR 4,795,000 4,795,000    
REVOLVING LOANS AMORTIZED COST BASIS 48,501,000 48,501,000    
REVOLVING LOANS CONVERTED TO TERM 888,000 888,000    
Total 102,775,000 102,775,000 13,473,000  
Current period gross charge-offs, 2023   9,000    
Current period gross charge-offs, 2022   35,000    
Current period gross charge-offs, 2021   43,000    
Current period gross charge-offs, 2020   7,000    
Current period gross charge-offs, 2019   8,000    
Current period gross charge-offs, Prior   173,000    
Current period gross charge-offs, Total   275,000 334,000 $ 131,000
Loan portfolio     13,473,000  
Pass | Commercial        
Financing Receivable, Credit Quality Indicator [Line Items]        
2023 128,219,000 128,219,000    
2022 118,099,000 118,099,000    
2021 125,833,000 125,833,000    
2020 69,601,000 69,601,000    
2019 57,123,000 57,123,000    
PRIOR 164,651,000 164,651,000    
REVOLVING LOANS AMORTIZED COST BASIS 64,716,000 64,716,000    
REVOLVING LOANS CONVERTED TO TERM 70,000 70,000    
Total 728,312,000 728,312,000    
Loan portfolio     646,056,000  
Pass | Commercial | Commercial and industrial.        
Financing Receivable, Credit Quality Indicator [Line Items]        
Loan portfolio     148,361,000  
Pass | Commercial | Commercial real estate (owner occupied)        
Financing Receivable, Credit Quality Indicator [Line Items]        
2023 17,801,000 17,801,000    
2022 6,750,000 6,750,000    
2021 15,067,000 15,067,000    
2020 8,415,000 8,415,000    
2019 10,322,000 10,322,000    
PRIOR 26,538,000 26,538,000    
REVOLVING LOANS AMORTIZED COST BASIS 351,000 351,000    
Total 85,244,000 85,244,000    
Loan portfolio     74,187,000  
Pass | Commercial | Other commercial and industrial        
Financing Receivable, Credit Quality Indicator [Line Items]        
2023 22,662,000 22,662,000    
2022 34,816,000 34,816,000    
2021 12,767,000 12,767,000    
2020 5,831,000 5,831,000    
2019 4,912,000 4,912,000    
PRIOR 19,587,000 19,587,000    
REVOLVING LOANS AMORTIZED COST BASIS 56,391,000 56,391,000    
REVOLVING LOANS CONVERTED TO TERM 70,000 70,000    
Total 157,036,000 157,036,000    
Pass | Commercial | Commercial real estate (non-owner occupied)        
Financing Receivable, Credit Quality Indicator [Line Items]        
Loan portfolio     423,486,000  
Pass | Commercial | Commercial real estate (non-owner occupied) - retail        
Financing Receivable, Credit Quality Indicator [Line Items]        
2023 35,545,000 35,545,000    
2022 23,368,000 23,368,000    
2021 33,110,000 33,110,000    
2020 23,146,000 23,146,000    
2019 9,226,000 9,226,000    
PRIOR 35,102,000 35,102,000    
REVOLVING LOANS AMORTIZED COST BASIS 983,000 983,000    
Total 160,480,000 160,480,000    
Pass | Commercial | Commercial real estate (non-owner occupied) - multi-family        
Financing Receivable, Credit Quality Indicator [Line Items]        
2023 22,620,000 22,620,000    
2022 16,767,000 16,767,000    
2021 16,622,000 16,622,000    
2020 12,041,000 12,041,000    
2019 9,638,000 9,638,000    
PRIOR 28,632,000 28,632,000    
REVOLVING LOANS AMORTIZED COST BASIS 1,321,000 1,321,000    
Total 107,641,000 107,641,000    
Pass | Commercial | Other commercial real estate (non-owner occupied)        
Financing Receivable, Credit Quality Indicator [Line Items]        
2023 29,591,000 29,591,000    
2022 36,398,000 36,398,000    
2021 48,267,000 48,267,000    
2020 20,168,000 20,168,000    
2019 23,025,000 23,025,000    
PRIOR 54,792,000 54,792,000    
REVOLVING LOANS AMORTIZED COST BASIS 5,670,000 5,670,000    
Total 217,911,000 217,911,000    
Special Mention | Commercial        
Financing Receivable, Credit Quality Indicator [Line Items]        
2022 314,000 314,000    
2021 591,000 591,000    
2019 2,252,000 2,252,000    
PRIOR 4,944,000 4,944,000    
REVOLVING LOANS AMORTIZED COST BASIS 923,000 923,000    
Total 9,024,000 9,024,000    
Loan portfolio     11,015,000  
Special Mention | Commercial | Commercial real estate (owner occupied)        
Financing Receivable, Credit Quality Indicator [Line Items]        
2021 464,000 464,000    
2019 2,252,000 2,252,000    
REVOLVING LOANS AMORTIZED COST BASIS 923,000 923,000    
Total 3,639,000 3,639,000    
Special Mention | Commercial | Other commercial and industrial        
Financing Receivable, Credit Quality Indicator [Line Items]        
2021 127,000 127,000    
Total 127,000 127,000    
Special Mention | Commercial | Commercial real estate (non-owner occupied)        
Financing Receivable, Credit Quality Indicator [Line Items]        
Loan portfolio     11,015,000  
Special Mention | Commercial | Commercial real estate (non-owner occupied) - retail        
Financing Receivable, Credit Quality Indicator [Line Items]        
2022 314,000 314,000    
PRIOR 1,167,000 1,167,000    
Total 1,481,000 1,481,000    
Special Mention | Commercial | Other commercial real estate (non-owner occupied)        
Financing Receivable, Credit Quality Indicator [Line Items]        
PRIOR 3,777,000 3,777,000    
Total 3,777,000 3,777,000    
Substandard | Commercial        
Financing Receivable, Credit Quality Indicator [Line Items]        
2022 1,662,000 1,662,000    
2020 966,000 966,000    
2019 7,521,000 7,521,000    
PRIOR 13,078,000 13,078,000    
REVOLVING LOANS AMORTIZED COST BASIS 64,000 64,000    
REVOLVING LOANS CONVERTED TO TERM 199,000 199,000    
Total 23,490,000 23,490,000    
Loan portfolio     22,248,000  
Substandard | Commercial | Commercial and industrial.        
Financing Receivable, Credit Quality Indicator [Line Items]        
Loan portfolio     5,037,000  
Substandard | Commercial | Commercial real estate (owner occupied)        
Financing Receivable, Credit Quality Indicator [Line Items]        
PRIOR 264,000 264,000    
Total 264,000 264,000    
Loan portfolio     971,000  
Substandard | Commercial | Other commercial and industrial        
Financing Receivable, Credit Quality Indicator [Line Items]        
2022 619,000 619,000    
PRIOR 1,578,000 1,578,000    
REVOLVING LOANS AMORTIZED COST BASIS 64,000 64,000    
Total 2,261,000 2,261,000    
Substandard | Commercial | Commercial real estate (non-owner occupied)        
Financing Receivable, Credit Quality Indicator [Line Items]        
Loan portfolio     16,240,000  
Substandard | Commercial | Commercial real estate (non-owner occupied) - multi-family        
Financing Receivable, Credit Quality Indicator [Line Items]        
2020 966,000 966,000    
2019 1,278,000 1,278,000    
PRIOR 123,000 123,000    
Total 2,367,000 2,367,000    
Substandard | Commercial | Other commercial real estate (non-owner occupied)        
Financing Receivable, Credit Quality Indicator [Line Items]        
2022 1,043,000 1,043,000    
2019 6,243,000 6,243,000    
PRIOR 11,113,000 11,113,000    
REVOLVING LOANS CONVERTED TO TERM 199,000 199,000    
Total $ 18,598,000 $ 18,598,000    
Doubtful | Commercial        
Financing Receivable, Credit Quality Indicator [Line Items]        
Loan portfolio     3,000  
Doubtful | Commercial | Commercial real estate (non-owner occupied)        
Financing Receivable, Credit Quality Indicator [Line Items]        
Loan portfolio     $ 3,000