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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Components of AOCI) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 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 $ (5,855) $ (8) (24,089) $ 4,737  
Balance at end of period 478,151   478,151    
Investment Securities          
Changes in each component of AOCI, net of tax          
Balance at beginning of period (14,161) 9,648 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 (6,072) (293) (24,712) 3,639  
Reclassification adjustments from AOCI 0 0 0 987  
Total other comprehensive income (loss), net of tax (6,072) (293) (24,712) 4,626  
Balance at end of period (20,233) 9,355 (20,233) 9,355  
Defined Benefit Plans          
Changes in each component of AOCI, net of tax          
Balance at beginning of period (7,087) (6,424) (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 217 285 623 738  
Total other comprehensive income (loss), net of tax 217 285 623 111  
Balance at end of period (6,870) (6,139) (6,870) (6,139)  
Accumulated Other Comprehensive Income (Loss)          
Changes in each component of AOCI, net of tax          
Balance at beginning of period (21,248) 3,224 (1,178) (1,521)  
Impact of the adoption of new accounting standards         (139)
Other comprehensive income (loss) before reclassifications (6,072) (293) (24,712) 3,012  
Reclassification adjustments from AOCI 217 285 623 1,725  
Total other comprehensive income (loss), net of tax (5,855) (8) (24,089) 4,737  
Balance at end of period $ (27,103) $ 3,216 (27,103) $ 3,216  
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)