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Accumulated Other Comprehensive Loss - Other Comprehensive Loss and Related Tax Effects (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Loss
Unrealized (loss) gain on investment securities available-for-sale	$ (2,014)	$ (1,790)	$ (3,417)
Net gain on the sale of investment securities available-for-sale			(623)
Amortization of actuarial loss (2)	194	195	208
Actuarial gain (loss)	(785)	123	709
Change in benefit plan liabilities	(591)	318	917
Net change in derivatives	246
Other comprehensive loss	(2,359)	(1,472)	(3,123)
Income tax	(496)	(515)	(1,093)
Other comprehensive loss, net of income taxes	$ (1,863)	$ (957)	$ (2,030)

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