OTHER COMPREHENSIVE INCOME (LOSS) Components of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
AFS Debt Securities:
Unrealized holding gains, pre-tax amount	$ (282)	$ (5,163)	$ (6,840)	$ 1,330
Unrealized holdings gains, tax (expense) benefit	61	1,110	1,471	(285)
Unrealized holdings gains, after-tax amount	(221)	(4,053)	(5,369)	1,045
Less: reclassification adjustment for amortization of securities transferred from AFS to HTM, pre-tax amount	(1,618)	1,696	(3,147)	(3,395)
Less: reclassification adjustment for amortization of securities transferred from AFS to HTM, tax (expense) benefit	348	(365)	677	730
Less: reclassification adjustment for amortization of securities transferred from AFS to HTM, after-tax amount	(1,270)	1,331	(2,470)	(2,665)
Net unrealized gains, pre-tax amount	1,336	(6,859)	(3,693)	4,725
Net unrealized gains, tax (expense) benefit	(287)	1,475	794	(1,015)
Net unrealized gains, after-tax amount	1,049	(5,384)	(2,899)	3,710
Cash Flow Hedges:
Net decrease in fair value, pre-tax amount	1,148	3,586	4,290	476
Net decrease in fair value, tax (expense) benefit	(247)	(772)	(923)	(102)
Net decrease in fair value, after-tax amount	901	2,814	3,367	374
Net decrease in fair value, pre-tax amount	943	3,729	4,116	410
Net decrease in fair value, tax (expense) benefit	(203)	(802)	(885)	(88)
Net decrease in fair value, after-tax amount	740	2,927	3,231	322
Postretirement Plans:
Net gain on postretirement plans, pre-tax amount	(7)	(8)	(14)	(14)
Net gain on postretirement plans, tax (expense) benefit	2	2	3	3
Net gain on postretirement plans, net of tax	(5)	(6)	(11)	(11)
Other comprehensive income, pre-tax amount	2,272	(3,138)	409	5,121
Other comprehensive income, tax (expense) benefit	(488)	675	(88)	(1,100)
Other comprehensive income (loss)	1,784	(2,463)	321	4,021
Interest Expense, Borrowings
Cash Flow Hedges:
Less: effective portion reclassified into interest expense, pre-tax amount	945	719	1,850	1,645
Less: effective portion reclassified into interest expense, tax (expense) benefit	(203)	(155)	(398)	(353)
Less: effective portion reclassified into interest expense, after-tax amount	742	564	1,452	1,292
Interest Income, Interest and Fees on Loans
Cash Flow Hedges:
Less: effective portion reclassified into interest expense, pre-tax amount	(740)	(862)	(1,676)	(1,579)
Less: effective portion reclassified into interest expense, tax (expense) benefit	159	185	360	339
Less: effective portion reclassified into interest expense, after-tax amount	$ (581)	$ (677)	$ (1,316)	$ (1,240)