MORTGAGE SERVICING RIGHTS - Change in Fair Value of Mortgage Servicing Rights Asset and Other Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
MORTGAGE SERVICING RIGHTS [Abstract]
Beginning balance	$ 26,292	$ 26,569	$ 27,474
Additions	1,080	958	1,470
Valuation adjustment	(3,331)	(1,235)	(2,375)
Ending balance	24,041	26,292	$ 26,569
Mortgage loans serviced for others	$ 1,810,579	$ 1,903,854
Mortgage servicing rights assets as a percentage of serviced mortgage loans	1.33%	1.38%