MORTGAGE SERVICING RIGHTS - Change in Fair Value of Mortgage Servicing Rights Asset and Other Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
MORTGAGE SERVICING RIGHTS [Abstract]
Beginning balance	$ 25,134	$ 26,426	$ 26,292	$ 26,569
Additions	249	207	832	689
Valuation adjustment	(925)	(2,060)	(2,666)	(2,685)
Ending balance	24,458	$ 24,573	24,458	$ 24,573
Mortgage loans serviced for others	$ 1,832,082		$ 1,832,082		$ 1,903,854
Mortgage servicing rights assets as a percentage of serviced mortgage loans	1.33%		1.33%		1.38%