FAIR VALUE - Assets and liabilities measured on a non-recurring basis (Details) $ in Thousands			1 Months Ended	3 Months Ended	12 Months Ended
	Sep. 30, 2023 USD ($)	Jun. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)	Sep. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Aug. 02, 2021	Jul. 01, 2021
Assets and Liabilities Measured on Nonrecurring Basis
Valuation allowance			$ 470		$ 470	$ 0
Acquisition-related contingent consideration adjustment					3,280	(300)	$ 200
Payment of contingent consideration					1,214	0	$ 0
FBD
Assets and Liabilities Measured on Nonrecurring Basis
Contingent consideration, measurement input									0.0105
Acquisition-related contingent consideration adjustment		$ 100	1,700
Fair value contingent consideration adjustment					$ 2,700
Estimated probability of achievement					100.00%
Fair value of the remaining contingent consideration liability			1,600		$ 1,600
FBD | Probability of achievement
Assets and Liabilities Measured on Nonrecurring Basis
Contingent consideration, measurement input									0.50
TGA
Assets and Liabilities Measured on Nonrecurring Basis
Contingent consideration, measurement input								0.450
Acquisition-related contingent consideration adjustment	$ 100	$ 1,100
Fair value contingent consideration adjustment					1,000
Payment of contingent consideration			500	$ 2,400	$ 2,400
Estimated probability of achievement					100.00%
Fair value of the remaining contingent consideration liability			1,700		$ 1,700
Minimum | TGA
Assets and Liabilities Measured on Nonrecurring Basis
Contingent consideration, measurement input								0.0082
Maximum | FBD
Assets and Liabilities Measured on Nonrecurring Basis
Payment of contingent consideration					2,700
Maximum | TGA
Assets and Liabilities Measured on Nonrecurring Basis
Contingent consideration, measurement input								0.0109
Payment of contingent consideration					1,000
Mortgage servicing rights
Assets and Liabilities Measured on Nonrecurring Basis
Valuation allowance			1,200		1,200	700
Level 3
Assets and Liabilities Measured on Nonrecurring Basis
Other real estate owned						503
Mortgage servicing rights			162		162
Contingent consideration			(5,150)		(5,150)	(2,800)
Level 3 | Minimum | Probability of achievement
Assets and Liabilities Measured on Nonrecurring Basis
Contingent consideration, measurement input 2			100,000		100,000
Non-recurring
Assets and Liabilities Measured on Nonrecurring Basis
Individually assessed loans			3,014		3,014	0
Other real estate owned			1,159		1,159	503
Mortgage servicing rights			162		162	1,169
Contingent consideration			(5,150)		(5,150)	(2,800)
Total			(815)		(815)	(1,128)
Non-recurring | Level 1
Assets and Liabilities Measured on Nonrecurring Basis
Individually assessed loans			0		0	0
Other real estate owned			0		0	0
Mortgage servicing rights			0		0	0
Contingent consideration			0		0	0
Total			0		0	0
Non-recurring | Level 2
Assets and Liabilities Measured on Nonrecurring Basis
Individually assessed loans			0		0	0
Other real estate owned			0		0	0
Mortgage servicing rights			0		0	0
Contingent consideration			0		0	0
Total			0		0	0
Non-recurring | Level 3
Assets and Liabilities Measured on Nonrecurring Basis
Individually assessed loans			3,014		3,014	0
Other real estate owned			1,159		1,159	503
Mortgage servicing rights			162		162	1,169
Contingent consideration			(5,150)		(5,150)	(2,800)
Total			$ (815)		$ (815)	$ (1,128)