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Comprehensive Income (Details) - Comprehensive Income (Loss) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
COMPREHENSIVE INCOME (Details) - Comprehensive Income (Loss) [Line Items]      
Sale of investment securities available-for-sale Net gains on sale investment securities $ (5,624) $ (2,991) $ 6,966
Sale of investment securities available-for-sale Income tax expense (2,142) (1,196) 2,635
Total reclassification 1,763 (3,595) 1,530
Reclassification out of Accumulated Other Comprehensive Income [Member]      
COMPREHENSIVE INCOME (Details) - Comprehensive Income (Loss) [Line Items]      
Sale of investment securities available-for-sale Net gains on sale investment securities 4,234 3,931 2,818
Sale of investment securities available-for-sale Income tax expense (1,682) (1,564) (986)
Sale of investment securities available-for-sale 2,552 2,367 1,832
Amortization of unrealized holding (losses) gains on securities transferred from available-for-sale to held-to-maturity Interest income (1,986) (220) (215)
Amortization of unrealized holding (losses) gains on securities transferred from available-for-sale to held-to-maturity Income tax benefit 813 90 91
Amortization of unrealized holding (losses) gains on securities transferred from available-for-sale to held-to-maturity (1,173) (130) (124)
Amortization of pension plan net actuarial losses Salaries and employee benefits (407) (443) 204
Amortization of pension plan net actuarial losses Income tax benefit 165 177 (83)
Amortization of pension plan net actuarial losses (242) (256) 121
Total reclassification $ 1,137 $ 1,981 $ 1,587