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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