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Comprehensive Income (Details) - Comprehensive Income (Loss) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
COMPREHENSIVE INCOME (Details) - Comprehensive Income (Loss) [Line Items] |  |  |
Sale of investment securities available-for-sale Net gains on sale investment securities | $ (1,350) | $ (5,624) | $ (2,991)
Sale of investment securities available-for-sale Income tax expense | (532) | (2,142) | (1,196)
Total reclassification | (1,173) | 1,763 | (3,595)
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 | 1,596 | 4,234 | 3,931
Sale of investment securities available-for-sale Income tax expense | (579) | (1,682) | (1,564)
Sale of investment securities available-for-sale | 1,017 | 2,552 | 2,367
Amortization of unrealized holding (losses) gains on securities transferred from available-for-sale to held-to-maturity Interest income |  | (1,986) | (220)
Amortization of unrealized holding (losses) gains on securities transferred from available-for-sale to held-to-maturity Income tax benefit |  | 813 | 90
Amortization of unrealized holding (losses) gains on securities transferred from available-for-sale to held-to-maturity |  | (1,173) | (130)
Amortization of pension plan net actuarial losses Salaries and employee benefits | (412) | (407) | (443)
Amortization of pension plan net actuarial losses Income tax benefit | 169 | 165 | 177
Amortization of pension plan net actuarial losses | (243) | (242) | (256)
Total reclassification | $ 774 | $ 1,137 | $ 1,981

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