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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Components of AOCI) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Changes in each component of AOCI, net of tax          
Balance at beginning of period     $ 500,011    
Impact of the adoption of new accounting standards         $ 0
Total other comprehensive income (loss), net of tax $ (3,519) $ 2,985 (18,234) $ 4,745  
Balance at end of period 480,668   480,668    
Investment Securities          
Changes in each component of AOCI, net of tax          
Balance at beginning of period (10,492) 6,853 4,934 4,729  
Impact of the adoption of new accounting standards         (139)
Impact of the adoption of new accounting standards     (455)    
Other comprehensive income (loss) before reclassifications (3,669) 1,808 (18,640) 3,932  
Reclassification adjustments from AOCI 0 987 0 987  
Total other comprehensive income (loss), net of tax (3,669) 2,795 (18,640) 4,919  
Balance at end of period (14,161) 9,648 (14,161) 9,648  
Defined Benefit Plans          
Changes in each component of AOCI, net of tax          
Balance at beginning of period (7,237) (6,614) (6,112) (6,250)  
Impact of the adoption of new accounting standards         0
Impact of the adoption of new accounting standards     (1,381)    
Other comprehensive income (loss) before reclassifications 0 0 0 (627)  
Reclassification adjustments from AOCI 150 190 406 453  
Total other comprehensive income (loss), net of tax 150 190 406 (174)  
Balance at end of period (7,087) (6,424) (7,087) (6,424)  
Accumulated Other Comprehensive Income (Loss)          
Changes in each component of AOCI, net of tax          
Balance at beginning of period (17,729) 239 (1,178) (1,521)  
Impact of the adoption of new accounting standards         (139)
Other comprehensive income (loss) before reclassifications (3,669) 1,808 (18,640) 3,305  
Reclassification adjustments from AOCI 150 1,177 406 1,440  
Total other comprehensive income (loss), net of tax (3,519) 2,985 (18,234) 4,745  
Balance at end of period $ (21,248) $ 3,224 (21,248) $ 3,224  
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     0    
Accounting Standards Update 2018-02 and Accounting Standards Update 2016-01 | Accumulated Other Comprehensive Income (Loss)          
Changes in each component of AOCI, net of tax          
Impact of the adoption of new accounting standards         $ (139)
Impact of the adoption of new accounting standards     (1,836)    
Previously Reported | Investment Securities          
Changes in each component of AOCI, net of tax          
Balance at beginning of period     5,073    
Previously Reported | Defined Benefit Plans          
Changes in each component of AOCI, net of tax          
Balance at beginning of period     (6,112)    
Previously Reported | Accumulated Other Comprehensive Income (Loss)          
Changes in each component of AOCI, net of tax          
Balance at beginning of period     $ (1,039)