LOAN SERVICING ACTIVITIES - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
LOAN SERVICING ACTIVITIES
Bank held borrowers' escrow balances	$ 1,300	$ 1,300
Fair value of SRAs	$ 3,000	$ 3,400
Weighted average default rate	0.62	0.67
Total loans, net of fair value hedge basis point adjustments	$ 10,871,943	$ 10,773,428
Real estate and C&I loans
LOAN SERVICING ACTIVITIES
Total loans, net of fair value hedge basis point adjustments	$ 329,100	$ 346,100
Minimum [Member]
LOAN SERVICING ACTIVITIES
Discount rates	10.00%	10.00%
Prepayment speeds	6.10%	6.50%
Maximum [Member]
LOAN SERVICING ACTIVITIES
Discount rates	13.90%	14.50%
Prepayment speeds	12.30%	12.20%