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OTHER COMPREHENSIVE INCOME (LOSS) Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance $ 508,286 $ 467,376 $ 495,064 $ 451,278
Other comprehensive (loss) income before reclassifications 13,703 (11,119) 11,701 (4,368)
Less: Amounts reclassified from AOCI (429) (2,845) (2,752) (115)
Other comprehensive income (loss) 14,132 (8,274) 14,453 (4,253)
Ending Balance 529,900 463,298 529,900 463,298
Accumulated Other Comprehensive Income (Loss)        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (101,231) (121,934) (101,552) (125,955)
Ending Balance (87,099) (130,208) (87,099) (130,208)
Net Unrealized Gains (Losses) on Debt Securities(1)        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (110,308) (127,829) (107,409) (131,539)
Other comprehensive (loss) income before reclassifications 17,593 (14,220) 12,224 (7,844)
Less: Amounts reclassified from AOCI (1,366) (2,821) (3,836) (155)
Other comprehensive income (loss) 18,959 (11,399) 16,060 (7,689)
Ending Balance (91,349) (139,228) (91,349) (139,228)
Net Unrealized Gains (Losses) on Cash Flow Hedges(1)        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance 9,327 6,213 6,096 5,891
Other comprehensive (loss) income before reclassifications (3,890) 3,101 (523) 3,476
Less: Amounts reclassified from AOCI 931 (29) 1,067 24
Other comprehensive income (loss) (4,821) 3,130 (1,590) 3,452
Ending Balance 4,506 9,343 4,506 9,343
Defined Benefit Postretirement Plans(1)        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (250) (318) (239) (307)
Other comprehensive (loss) income before reclassifications 0 0 0 0
Less: Amounts reclassified from AOCI 6 5 17 16
Other comprehensive income (loss) (6) (5) (17) (16)
Ending Balance $ (256) $ (323) $ (256) $ (323)