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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Other Comprehensive Income (Loss), before Reclassification Adjustments and Tax [Abstract]                
Unrealized gain (loss) on investment securities $ 30,977 $ 31,144 $ 28,543 $ 60,869        
Unrealized gain (loss) on derivatives   94   187        
Retirement obligation 0 0 0 0        
Total 30,977 31,238 28,543 61,056        
Other Comprehensive Income (Loss) Reclassifications before Tax [Abstract]                
Realized gain (loss) on securities available-for-sale 2 (37) (57) (215)        
Unrealized gain (loss) on derivatives   0   0        
Retirement obligation (457) (320) (882) (695)        
Total (455) (357) (939) (910)        
Transactions Pre-tax                
Unrealized gain (loss) on investment securities 30,975 31,181 28,600 61,084        
Unrealized gain (loss) on derivatives   94   187        
Unfunded pension obligation 457 320 882 695        
Total 31,432 31,595 29,482 61,966        
Transactions Tax-effect                
Unrealized gain (loss) on investment securities (6,685) (6,671) (6,173) (13,069)        
Unrealized gain (loss) on derivatives   (22)   (43)        
Retirement obligation (104) (74) (201) (159)        
Total (6,789) (6,767) (6,374) (13,271)        
Transactions Net of tax                
Unrealized gain (loss) on investment securities 24,290 24,510 22,427 48,015        
Unrealized gain (loss) on derivatives 0 72 0 144        
Retirement obligation 353 246 681 536        
Total 24,643 24,828 23,108 48,695        
Cumulative effect of new standard                
Unrealized gain (loss) on investment securities       906        
Unrealized gain (loss) on Derivatives       0        
Retirement obligation       0        
Total       906        
Balances Net of tax                
Unrealized gain (loss) on investment securities 63,691 37,320 63,691 37,320 $ 39,401 $ 41,264 $ 12,810 $ (11,601)
Unrealized gain (loss) on cash flow hedges   (73)   (73)     (145) (217)
Retirement obligation (27,260) (32,054) (27,260) (32,054) (27,613) (27,941) (32,300) (32,590)
Total 36,431 5,193 36,431 5,193 $ 11,788 $ 13,323 $ (19,635) $ (44,408)
Accumulated other comprehensive income (loss)                
Transactions Net of tax                
Total $ 24,643 $ 24,828 $ 23,108 $ 48,695