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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Components of AOCI) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Changes in each component of AOCI, net of tax                
Balance at beginning of period     $ 528,520       $ 528,520  
Total other comprehensive income (loss), net of tax $ (2,010) $ 6,479 10,663 $ 4,669 $ 12,413 $ 11,238 15,132 $ 28,320
Balance at end of period 543,903           543,903  
Investment Securities                
Changes in each component of AOCI, net of tax                
Balance at beginning of period 31,247   14,825 10,418   (9,643) 14,825 (9,643)
Other comprehensive income before reclassifications (2,515)     4,412     13,907 27,573
Reclassification adjustments from AOCI 258     (26)     258 (26)
Total other comprehensive income (loss), net of tax (2,257)     4,386     14,165 27,547
Balance at end of period 28,990 31,247   14,804 10,418   28,990 14,804
Investment Securities | Impact of the adoption of new accounting standards                
Changes in each component of AOCI, net of tax                
Balance at beginning of period           (3,100)   (3,100)
Investment Securities | Adjusted balance at beginning of period                
Changes in each component of AOCI, net of tax                
Balance at beginning of period           (12,743)   (12,743)
Defined Benefit Plans                
Changes in each component of AOCI, net of tax                
Balance at beginning of period (5,696)   (6,416) (5,960)   (6,450) (6,416) (6,450)
Other comprehensive income before reclassifications 0     0     313 0
Reclassification adjustments from AOCI 247     283     654 773
Total other comprehensive income (loss), net of tax 247     283     967 773
Balance at end of period (5,449) (5,696)   (5,677) (5,960)   (5,449) (5,677)
Defined Benefit Plans | Impact of the adoption of new accounting standards                
Changes in each component of AOCI, net of tax                
Balance at beginning of period           0   0
Defined Benefit Plans | Adjusted balance at beginning of period                
Changes in each component of AOCI, net of tax                
Balance at beginning of period           (6,450)   (6,450)
Accum. Other Comp. Income (Loss)                
Changes in each component of AOCI, net of tax                
Balance at beginning of period 25,551   8,409 4,458   (16,093) 8,409 (16,093)
Other comprehensive income before reclassifications (2,515)     4,412     14,220 27,573
Reclassification adjustments from AOCI 505     257     912 747
Total other comprehensive income (loss), net of tax (2,010) 6,479 $ 10,663 4,669 12,413 11,238 15,132 28,320
Balance at end of period $ 23,541 $ 25,551   $ 9,127 $ 4,458   $ 23,541 9,127
Accum. Other Comp. Income (Loss) | Impact of the adoption of new accounting standards                
Changes in each component of AOCI, net of tax                
Balance at beginning of period           (3,100)   (3,100)
Accum. Other Comp. Income (Loss) | Adjusted balance at beginning of period                
Changes in each component of AOCI, net of tax                
Balance at beginning of period           $ (19,193)   $ (19,193)