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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Components of AOCI) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Changes in each component of AOCI, net of tax                
Balance at beginning of period     $ 546,685       $ 546,685  
Total other comprehensive (loss) income, net of tax $ (6,659) $ 1,915 (17,117) $ (2,010) $ 6,479 $ 10,663 (21,861) $ 15,132
Balance at end of period 555,419           555,419  
Investment Securities                
Changes in each component of AOCI, net of tax                
Balance at beginning of period 11,077   26,651 31,247   14,825 26,651 14,825
Other comprehensive income before reclassifications (6,779)     (2,515)     (22,316) 13,907
Reclassification adjustments from AOCI (73)     258     (110) 258
Total other comprehensive (loss) income, net of tax (6,852)     (2,257)     (22,426) 14,165
Balance at end of period 4,225 11,077   28,990 31,247   4,225 28,990
Defined Benefit Plans                
Changes in each component of AOCI, net of tax                
Balance at beginning of period (6,151)   (6,523) (5,696)   (6,416) (6,523) (6,416)
Other comprehensive income before reclassifications 0     0     0 313
Reclassification adjustments from AOCI 193     247     565 654
Total other comprehensive (loss) income, net of tax 193     247     565 967
Balance at end of period (5,958) (6,151)   (5,449) (5,696)   (5,958) (5,449)
Accum. Other Comp. Income (Loss)                
Changes in each component of AOCI, net of tax                
Balance at beginning of period 4,926   20,128 25,551   8,409 20,128 8,409
Other comprehensive income before reclassifications (6,779)     (2,515)     (22,316) 14,220
Reclassification adjustments from AOCI 120     505     455 912
Total other comprehensive (loss) income, net of tax (6,659) 1,915 $ (17,117) (2,010) 6,479 $ 10,663 (21,861) 15,132
Balance at end of period $ (1,733) $ 4,926   $ 23,541 $ 25,551   $ (1,733) $ 23,541