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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Changes in AOCI) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Changes in each component of accumulated other comprehensive income (loss), net of tax      
Balance at the beginning of the period $ 203 $ 3,159 $ (15,845)
Other comprehensive income (loss) before reclassifications (5,030) (5,116) 17,709
Amounts reclassified from AOCI 3,306 2,160 1,295
Other comprehensive income (loss), net of tax (1,724) (2,956) 19,004
Balance at the end of the period (1,521) 203 3,159
Investment Securities      
Changes in each component of accumulated other comprehensive income (loss), net of tax      
Balance at the beginning of the period 9,181 13,586 (9,125)
Other comprehensive income (loss) before reclassifications (4,452) (5,529) 22,066
Amounts reclassified from AOCI 0 1,124 645
Other comprehensive income (loss), net of tax (4,452) (4,405) 22,711
Balance at the end of the period 4,729 9,181 13,586
Defined Benefit Plans      
Changes in each component of accumulated other comprehensive income (loss), net of tax      
Balance at the beginning of the period (8,978) (10,427) (6,720)
Other comprehensive income (loss) before reclassifications (578) 413 (4,357)
Amounts reclassified from AOCI 3,306 1,036 650
Other comprehensive income (loss), net of tax 2,728 1,449 (3,707)
Balance at the end of the period $ (6,250) $ (8,978) $ (10,427)