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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Dec. 31, 2018
Other Comprehensive Income (Loss), before Reclassification Adjustments and Tax [Abstract]                
Unrealized gain (loss) on investment securities $ 6,931 $ 12,719 $ 35,474 $ 73,588        
Unrealized gain (loss) on derivatives   94   281        
Retirement obligation 0 0 0 0        
Total 6,931 12,813 35,474 73,869        
Other Comprehensive Income (Loss) Reclassifications before Tax [Abstract]                
Realized gain (loss) on securities available-for-sale 2 105 (55) (110)        
Unrealized gain (loss) on derivatives   0   0        
Retirement obligation (519) (347) (1,401) (1,042)        
Total (517) (242) (1,456) (1,152)        
Transactions Pre-tax                
Unrealized gain (loss) on investment securities 6,929 12,614 35,529 73,698        
Unrealized gain (loss) on derivatives   94   281        
Unfunded pension obligation 519 347 1,401 1,042        
Total 7,448 13,055 36,930 75,021        
Transactions Tax-effect                
Unrealized gain (loss) on investment securities (1,495) (2,699) (7,668) (15,768)        
Unrealized gain (loss) on derivatives   (21)   (64)        
Retirement obligation (118) (78) (319) (237)        
Total (1,613) (2,798) (7,987) (16,069)        
Transactions Net of tax                
Unrealized gain (loss) on investment securities 5,434 9,915 27,861 57,930        
Unrealized gain (loss) on derivatives 0 73 0 217        
Retirement obligation 401 269 1,082 805        
Total 5,835 10,257 28,943 58,952        
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 69,125 47,235 69,125 47,235 $ 63,691 $ 41,264 $ 37,320 $ (11,601)
Unrealized gain (loss) on cash flow hedges   0   0     (73) (217)
Retirement obligation (26,859) (31,785) (26,859) (31,785) (27,260) (27,941) (32,054) (32,590)
Total 42,266 15,450 42,266 15,450 $ 36,431 $ 13,323 $ 5,193 $ (44,408)
Accumulated other comprehensive income (loss)                
Transactions Net of tax                
Total $ 5,835 $ 10,257 $ 28,943 $ 58,952