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Comprehensive Income (Details) - Comprehensive Income (Loss) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Sale of investment securities available-for-sale Net gains on sale investment securities | $ (6,444) | $ (1,350) | $ (5,624)
Sale of investment securities available-for-sale Income tax expense | (1,638) | (532) | (2,142)
Total reclassification | (4,116) | (1,173) | 1,763
Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Sale of investment securities available-for-sale Net gains on sale investment securities |  | 1,596 | 4,234
Sale of investment securities available-for-sale Income tax expense |  | (579) | (1,682)
Sale of investment securities available-for-sale |  | 1,017 | 2,552
Amortization of unrealized holding (losses) gains on securities transferred from available-for-sale to held-to-maturity Interest income |  |  | (1,986)
Amortization of unrealized holding (losses) gains on securities transferred from available-for-sale to held-to-maturity Income tax benefit |  |  | 813
Amortization of unrealized holding (losses) gains on securities transferred from available-for-sale to held-to-maturity |  |  | (1,173)
Amortization of pension plan net actuarial losses Salaries and employee benefits | (359) | (412) | (407)
Amortization of pension plan net actuarial losses Income tax benefit | 101 | 169 | 165
Amortization of pension plan net actuarial losses | (258) | (243) | (242)
Total reclassification | $ (258) | $ 774 | $ 1,137

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