ALLOWANCE FOR CREDIT LOSSES AND CREDIT QUALITY INFORMATION - Narrative (Details) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2026 USD ($)	Jun. 30, 2025 USD ($)	Jun. 30, 2026 USD ($) loan	Jun. 30, 2025 USD ($)	Dec. 31, 2025 USD ($) loan	Mar. 31, 2026 USD ($)	Mar. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan workout and other credit costs	$ 2,087	$ 1,629	$ 4,261	$ 1,869
Allowance for credit losses related to other accounts receivable	2,767	2,811	2,767	2,811	$ 2,848	$ 2,860	$ 567	$ 0
Various Modifications
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unused commitments to extend credit	9,900		$ 9,900		$ 6,400
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans in the process of foreclosure \| loan			25		29
Total loans outstanding			$ 5,200		$ 6,200
Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of loans in the process of foreclosure \| loan			41		37
Total loans outstanding			$ 38,700		$ 36,400
Residential and Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loan workout and other credit costs	$ 1,300	$ 1,400	$ 3,000	$ 2,100
Impairment loans, charge off period			90 days