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OTHER COMPREHENSIVE INCOME (LOSS) Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance $ 531,231 $ 495,064
Other comprehensive income (loss) before reclassifications 11,827 (2,681)
Less: Amounts reclassified from AOCI (564) (1,218)
Other comprehensive income (loss) 12,391 (1,463)
Ending Balance 640,054 501,577
Accumulated Other Comprehensive Income (Loss)    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (94,646) (101,552)
Ending Balance (82,255) (103,015)
Net Unrealized Gains (Losses) on Debt Securities(1)    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (104,015) (107,409)
Other comprehensive income (loss) before reclassifications 13,264 (5,148)
Less: Amounts reclassified from AOCI (1,138) (1,200)
Other comprehensive income (loss) 14,402 (3,948)
Ending Balance (89,613) (111,357)
Net Unrealized Gains (Losses) on Cash Flow Hedges(1)    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance 8,958 6,096
Other comprehensive income (loss) before reclassifications (1,437) 2,467
Less: Amounts reclassified from AOCI 568 (24)
Other comprehensive income (loss) (2,005) 2,491
Ending Balance 6,953 8,587
Defined Benefit Postretirement Plans(1)    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance 411 (239)
Other comprehensive income (loss) before reclassifications 0 0
Less: Amounts reclassified from AOCI 6 6
Other comprehensive income (loss) (6) (6)
Ending Balance $ 405 $ (245)