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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Components of AOCI) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Jan. 01, 2020
Dec. 31, 2019
Jan. 01, 2019
Changes in each component of AOCI, net of tax          
Balance at beginning of period $ 528,520        
Adjusted balance     $ 525,364   $ 488,625
Total other comprehensive income, net of tax 10,663 $ 11,238      
Balance at end of period 533,781        
Investment Securities          
Changes in each component of AOCI, net of tax          
Balance at beginning of period   (9,643)      
Adjusted balance       $ 14,825  
Other comprehensive income before reclassifications 10,147 10,996      
Reclassification adjustments from AOCI 0 0      
Total other comprehensive income, net of tax 10,147 10,996      
Balance at end of period 24,972 (1,747)      
Defined Benefit Plans          
Changes in each component of AOCI, net of tax          
Balance at beginning of period   (6,450)      
Adjusted balance       (6,416)  
Other comprehensive income before reclassifications 313 0      
Reclassification adjustments from AOCI 203 242      
Total other comprehensive income, net of tax 516 242      
Balance at end of period (5,900) (6,208)      
Accum. Other Comp. Income (Loss)          
Changes in each component of AOCI, net of tax          
Balance at beginning of period   (16,093)      
Adjusted balance     $ 8,409 $ 8,409 $ (19,193)
Other comprehensive income before reclassifications 10,460 10,996      
Reclassification adjustments from AOCI 203 242      
Total other comprehensive income, net of tax 10,663 11,238      
Balance at end of period $ 19,072 (7,955)      
Impact of the adoption of new accounting standards | Investment Securities          
Changes in each component of AOCI, net of tax          
Balance at beginning of period   (3,100)      
Impact of the adoption of new accounting standards | Defined Benefit Plans          
Changes in each component of AOCI, net of tax          
Balance at beginning of period   0      
Impact of the adoption of new accounting standards | Accum. Other Comp. Income (Loss)          
Changes in each component of AOCI, net of tax          
Balance at beginning of period   (3,100)      
Adjusted balance at beginning of period | Investment Securities          
Changes in each component of AOCI, net of tax          
Balance at beginning of period   (12,743)      
Adjusted balance at beginning of period | Defined Benefit Plans          
Changes in each component of AOCI, net of tax          
Balance at beginning of period   (6,450)      
Adjusted balance at beginning of period | Accum. Other Comp. Income (Loss)          
Changes in each component of AOCI, net of tax          
Balance at beginning of period   $ (19,193)