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FAIR VALUE - Significant unobservable inputs (Details)
 9 Months Ended 12 Months Ended
Sep. 30, 2023
USD ($)
$ / loan
Dec. 31, 2022
USD ($)
$ / loan
Fair value of collateral | Estimated cost of disposal/market adjustment    
Significant Unobservable Inputs used in determination of Fair Value of Assets Classified as Level 3    
Individually assessed loans, Valuation Technique [Extensible List] Fair value of collateral  
Individually assessed loans, Measurement Input [Extensible List] us-gaap:MeasurementInputCostToSellMember  
Other real estate owned, valuation technique [Extensible List] Fair value of collateral Fair value of collateral
Other real estate owned, measurement input [Extensible List] us-gaap:MeasurementInputCostToSellMember us-gaap:MeasurementInputCostToSellMember
Discounted cash flow | Embedded servicing value    
Significant Unobservable Inputs used in determination of Fair Value of Assets Classified as Level 3    
Commitments to originate real estate loans for sale, Valuation Technique [Extensible List] Discounted cash flow Discounted cash flow
Commitments to originate real estate loans for sale, Measurement Input [Extensible List] Embedded servicing value Embedded servicing value
Discounted cash flow | Weighted average constant prepayment rate    
Significant Unobservable Inputs used in determination of Fair Value of Assets Classified as Level 3    
Mortgage servicing rights, Valuation Technique [Extensible List] Discounted cash flow Discounted cash flow
Mortgage servicing rights, Measurement Input [Extensible List] Weighted average constant prepayment rate Weighted average constant prepayment rate
Discounted cash flow | Weighted average discount rate    
Significant Unobservable Inputs used in determination of Fair Value of Assets Classified as Level 3    
Mortgage servicing rights, Measurement Input [Extensible List] Weighted average discount rate Weighted average discount rate
Contingent consideration, Valuation Technique [Extensible List] Discounted cash flow Discounted cash flow
Contingent consideration, Measurement Input [Extensible List] Weighted average discount rate Weighted average discount rate
Discounted cash flow | Adequate compensation    
Significant Unobservable Inputs used in determination of Fair Value of Assets Classified as Level 3    
Mortgage servicing rights, Measurement Input [Extensible List] Adequate compensation Adequate compensation
Discounted cash flow | Probability of achievement    
Significant Unobservable Inputs used in determination of Fair Value of Assets Classified as Level 3    
Contingent consideration, Measurement Input [Extensible List] Probability of achievement Probability of achievement
Minimum | Fair value of collateral | Estimated cost of disposal/market adjustment    
Significant Unobservable Inputs used in determination of Fair Value of Assets Classified as Level 3    
Other real estate owned, measurement input 0.090  
Maximum | Fair value of collateral | Estimated cost of disposal/market adjustment    
Significant Unobservable Inputs used in determination of Fair Value of Assets Classified as Level 3    
Other real estate owned, measurement input 0.738  
Level 3 | Fair value of collateral | Estimated cost of disposal/market adjustment    
Significant Unobservable Inputs used in determination of Fair Value of Assets Classified as Level 3    
Individually assessed loans $ 3,014,000  
Individually assessed loans, measurement input 0.272  
Other real estate owned $ 578,000 $ 503,000
Level 3 | Discounted cash flow | Embedded servicing value    
Significant Unobservable Inputs used in determination of Fair Value of Assets Classified as Level 3    
Commitments to originate real estate loans for sale $ 13,000 $ 5,000
Commitments to originate real estate loans for sale, measurement input 0.010 0.010
Mortgage servicing rights $ 309,000 $ 1,169,000
Level 3 | Discounted cash flow | Weighted average discount rate    
Significant Unobservable Inputs used in determination of Fair Value of Assets Classified as Level 3    
Contingent consideration $ (2,950,000) $ (2,800,000)
Level 3 | Discounted cash flow | Adequate compensation    
Significant Unobservable Inputs used in determination of Fair Value of Assets Classified as Level 3    
Mortgage servicing rights, measurement input | $ / loan 7 7
Level 3 | Minimum | Fair value of collateral | Estimated cost of disposal/market adjustment    
Significant Unobservable Inputs used in determination of Fair Value of Assets Classified as Level 3    
Other real estate owned, measurement input 0.090 0.090
Level 3 | Minimum | Discounted cash flow | Weighted average constant prepayment rate    
Significant Unobservable Inputs used in determination of Fair Value of Assets Classified as Level 3    
Mortgage servicing rights, measurement input 0.056 0.029
Level 3 | Minimum | Discounted cash flow | Weighted average discount rate    
Significant Unobservable Inputs used in determination of Fair Value of Assets Classified as Level 3    
Mortgage servicing rights, measurement input 0.053 0.046
Contingent consideration, measurement input 0.067 0.059
Level 3 | Minimum | Discounted cash flow | Probability of achievement    
Significant Unobservable Inputs used in determination of Fair Value of Assets Classified as Level 3    
Contingent consideration, measurement input 0.378 0.449
Level 3 | Maximum | Fair value of collateral | Estimated cost of disposal/market adjustment    
Significant Unobservable Inputs used in determination of Fair Value of Assets Classified as Level 3    
Other real estate owned, measurement input 0.738 0.728
Level 3 | Maximum | Discounted cash flow | Weighted average constant prepayment rate    
Significant Unobservable Inputs used in determination of Fair Value of Assets Classified as Level 3    
Mortgage servicing rights, measurement input 0.061 0.033
Level 3 | Maximum | Discounted cash flow | Weighted average discount rate    
Significant Unobservable Inputs used in determination of Fair Value of Assets Classified as Level 3    
Mortgage servicing rights, measurement input 0.057 0.049
Contingent consideration, measurement input 0.069 0.062
Level 3 | Maximum | Discounted cash flow | Probability of achievement    
Significant Unobservable Inputs used in determination of Fair Value of Assets Classified as Level 3    
Contingent consideration, measurement input 1.000 0.535
Level 3 | Weighted Average | Fair value of collateral | Estimated cost of disposal/market adjustment    
Significant Unobservable Inputs used in determination of Fair Value of Assets Classified as Level 3    
Other real estate owned, measurement input (0.385) 0.357
Level 3 | Weighted Average | Fair value of collateral | Weighted average constant prepayment rate    
Significant Unobservable Inputs used in determination of Fair Value of Assets Classified as Level 3    
Mortgage servicing rights, measurement input (0.056)  
Level 3 | Weighted Average | Discounted cash flow | Weighted average constant prepayment rate    
Significant Unobservable Inputs used in determination of Fair Value of Assets Classified as Level 3    
Mortgage servicing rights, measurement input   0.029
Level 3 | Weighted Average | Discounted cash flow | Weighted average discount rate    
Significant Unobservable Inputs used in determination of Fair Value of Assets Classified as Level 3    
Mortgage servicing rights, measurement input (0.057) 0.049
Contingent consideration, measurement input (0.069) 0.061
Level 3 | Weighted Average | Discounted cash flow | Probability of achievement    
Significant Unobservable Inputs used in determination of Fair Value of Assets Classified as Level 3    
Contingent consideration, measurement input (0.709) 0.501