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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Changes in AOCI) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Changes in each component of accumulated other comprehensive income (loss), net of tax      
Balance at the beginning of the period $ (1,521) $ 203 $ 3,159
Other comprehensive income (loss) before reclassifications (1,305) (5,030) (5,116)
Amounts reclassified from AOCI 1,787 3,306 2,160
Total other comprehensive income (loss), net of tax 482 (1,724) (2,956)
Balance at the end of the period (1,039) (1,521) 203
Investment Securities      
Changes in each component of accumulated other comprehensive income (loss), net of tax      
Balance at the beginning of the period 4,729 9,181 13,586
Other comprehensive income (loss) before reclassifications (505) (4,452) (5,529)
Amounts reclassified from AOCI 849 0 1,124
Total other comprehensive income (loss), net of tax 344 (4,452) (4,405)
Balance at the end of the period 5,073 4,729 9,181
Defined Benefit Plans      
Changes in each component of accumulated other comprehensive income (loss), net of tax      
Balance at the beginning of the period (6,250) (8,978) (10,427)
Other comprehensive income (loss) before reclassifications (800) (578) 413
Amounts reclassified from AOCI 938 3,306 1,036
Total other comprehensive income (loss), net of tax 138 2,728 1,449
Balance at the end of the period $ (6,112) $ (6,250) $ (8,978)