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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, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance $ 545,548 $ 506,467 $ 529,314 $ 473,415
Other comprehensive (loss) income before reclassifications (4,773) (46) (17,482) 25,146
Less: Amounts reclassified from AOCI (272) (265) (909) (697)
Other comprehensive (loss) income (4,501) 219 (16,573) 25,843
Ending Balance 545,984 517,522 545,984 517,522
Accumulated Other Comprehensive Income (Loss)        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance 8,668 19,356 20,740 (6,268)
Ending Balance 4,167 19,575 4,167 19,575
Net Unrealized Gains (Losses) on AFS Debt Securities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance 14,097 29,310 29,310 3,250
Other comprehensive (loss) income before reclassifications (5,139) (586) (20,352) 25,474
Less: Amounts reclassified from AOCI 0 0 0 0
Other comprehensive (loss) income (5,139) (586) (20,352) 25,474
Ending Balance 8,958 28,724 8,958 28,724
Net Unrealized Losses (Gains) on Cash Flow Hedges        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (1,826) (6,750) (4,626) (6,048)
Other comprehensive (loss) income before reclassifications 366 540 2,870 (328)
Less: Amounts reclassified from AOCI (101) (132) (397) (298)
Other comprehensive (loss) income 467 672 3,267 (30)
Ending Balance (1,359) (6,078) (1,359) (6,078)
Defined Benefit Postretirement Plans        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance (3,603) (3,204) (3,944) (3,470)
Other comprehensive (loss) income before reclassifications 0 0 0 0
Less: Amounts reclassified from AOCI (171) (133) (512) (399)
Other comprehensive (loss) income 171 133 512 399
Ending Balance $ (3,432) $ (3,071) $ (3,432) $ (3,071)