ALLOWANCE FOR CREDIT LOSSES AND CREDIT QUALITY INFORMATION - Narrative (Details) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2025 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($) loan	Jun. 30, 2024 USD ($)	Dec. 31, 2024 USD ($) loan	Mar. 31, 2025 USD ($)	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan workout and other credit costs	$ 1,629	$ (1,278)	$ 1,869	$ (207)
Allowance for credit losses related to other accounts receivable	2,811	0	2,811	0	$ 0	$ 567	$ 0	$ 0
Various Modifications
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unused commitments to extend credit	20,100		$ 20,100		$ 18,600
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans in the process of foreclosure | loan			33		31
Total loans outstanding			$ 6,600		$ 5,600
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans in the process of foreclosure | loan			16		15
Total loans outstanding			$ 34,600		$ 6,600
Residential and Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan workout and other credit costs	$ 1,400	$ 300	$ 2,100	$ (100)
Impairment loans, charge off period			90 days