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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Components of AOCI) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Jan. 01, 2020
Jan. 01, 2019
Changes in each component of AOCI, net of tax                
Balance at beginning of period   $ 528,520     $ 528,520      
Adjusted balance             $ 525,364 $ 488,625
Total other comprehensive income, net of tax $ 6,479 10,663 $ 12,413 $ 11,238 17,142 $ 23,651    
Balance at end of period 544,271       544,271      
Investment Securities                
Changes in each component of AOCI, net of tax                
Balance at beginning of period   14,825 (1,747) (9,643) 14,825 (9,643)    
Impact of the adoption of new accounting standards               (3,100)
Adjusted balance   24,972           (12,743)
Other comprehensive income before reclassifications 6,275   12,165   16,422 23,161    
Reclassification adjustments from AOCI 0   0   0 0    
Total other comprehensive income, net of tax 6,275   12,165   16,422 23,161    
Balance at end of period 31,247   10,418 (1,747) 31,247 10,418    
Defined Benefit Plans                
Changes in each component of AOCI, net of tax                
Balance at beginning of period   (6,416) (6,208) (6,450) (6,416) (6,450)    
Impact of the adoption of new accounting standards               0
Adjusted balance   (5,900)           (6,450)
Other comprehensive income before reclassifications 0   0   313 0    
Reclassification adjustments from AOCI 204   248   407 490    
Total other comprehensive income, net of tax 204   248   720 490    
Balance at end of period (5,696)   (5,960) (6,208) (5,696) (5,960)    
Accum. Other Comp. Income (Loss)                
Changes in each component of AOCI, net of tax                
Balance at beginning of period   8,409 (7,955) (16,093) 8,409 (16,093)    
Adjusted balance   19,072         $ 8,409 (19,193)
Other comprehensive income before reclassifications 6,275   12,165   16,735 23,161    
Reclassification adjustments from AOCI 204   248   407 490    
Total other comprehensive income, net of tax 6,479 $ 10,663 12,413 11,238 17,142 23,651    
Balance at end of period $ 25,551   $ 4,458 $ (7,955) $ 25,551 $ 4,458    
Accum. Other Comp. Income (Loss) | Accounting Standards Update 2018-02 and Accounting Standards Update 2016-01                
Changes in each component of AOCI, net of tax                
Impact of the adoption of new accounting standards               $ (3,100)