LOANS - Non-accrual loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Sep. 30, 2026
LOANS
Nonaccrual loans	$ 3,074	$ 3,306
Nonaccrual loans without related allowance for credit losses	2,673	3,147
Recognized interest income	6
Mortgage loans on real estate | One-to four-family first lien residential
LOANS
Nonaccrual loans	1,455	1,071
Nonaccrual loans without related allowance for credit losses	1,054	1,071
Mortgage loans on real estate | Commercial
LOANS
Nonaccrual loans	1,578	2,076
Nonaccrual loans without related allowance for credit losses	1,578	2,076
Recognized interest income	6
Commercial and industrial
LOANS
Nonaccrual loans	41	147
Nonaccrual loans without related allowance for credit losses	$ 41
Consumer loans
LOANS
Nonaccrual loans		$ 12