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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Changes in AOCI) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Changes in each component of accumulated other comprehensive income (loss), net of tax      
Balance at the beginning of the period $ (1,039) $ (1,521) $ 203
Impact of adoption of new accounting standards   (139)  
Other comprehensive income (loss) before reclassifications (13,725) (1,305) (5,030)
Amounts reclassified from AOCI 646 1,787 3,306
Total other comprehensive income (loss), net of tax (13,079) 482 (1,724)
Balance at the end of the period (16,093) (1,039) (1,521)
Investment Securities      
Changes in each component of accumulated other comprehensive income (loss), net of tax      
Balance at the beginning of the period 5,073 4,729 9,181
Impact of adoption of new accounting standards   (139)  
Other comprehensive income (loss) before reclassifications (13,918) (505) (4,452)
Amounts reclassified from AOCI (204) 849 0
Total other comprehensive income (loss), net of tax (14,122) 344 (4,452)
Balance at the end of the period (9,643) 5,073 4,729
Defined Benefit Plans      
Changes in each component of accumulated other comprehensive income (loss), net of tax      
Balance at the beginning of the period (6,112) (6,250) (8,978)
Impact of adoption of new accounting standards   0  
Other comprehensive income (loss) before reclassifications 193 (800) (578)
Amounts reclassified from AOCI 850 938 3,306
Total other comprehensive income (loss), net of tax 1,043 138 2,728
Balance at the end of the period (6,450) (6,112) $ (6,250)
As Adjusted [Member]      
Changes in each component of accumulated other comprehensive income (loss), net of tax      
Balance at the beginning of the period (1,178)    
Balance at the end of the period   (1,178)  
As Adjusted [Member] | Investment Securities      
Changes in each component of accumulated other comprehensive income (loss), net of tax      
Balance at the beginning of the period 4,934    
Balance at the end of the period   4,934  
As Adjusted [Member] | Defined Benefit Plans      
Changes in each component of accumulated other comprehensive income (loss), net of tax      
Balance at the beginning of the period (6,112)    
Balance at the end of the period   $ (6,112)  
Accounting Standards Update 2018-02      
Changes in each component of accumulated other comprehensive income (loss), net of tax      
Impact of adoption of new accounting standards (1,836)    
Accounting Standards Update 2018-02 | Investment Securities      
Changes in each component of accumulated other comprehensive income (loss), net of tax      
Impact of adoption of new accounting standards (455)    
Accounting Standards Update 2018-02 | Defined Benefit Plans      
Changes in each component of accumulated other comprehensive income (loss), net of tax      
Impact of adoption of new accounting standards $ 1,381