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Accumulated Other Comprehensive Loss - Other Comprehensive Loss and Related Tax Effects (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Loss
Unrealized loss on investment securities available-for-sale	$ 5,109	$ (2,014)	$ (1,790)
Net gain on the sale of investment securities available-for-sale	(23)
Amortization of actuarial loss (2)	227	194	195
Actuarial gain (loss)	412	(785)	123
Change in benefit plan liabilities	639	(591)	318
Net change in derivatives		246
Net change in derivatives	441
Other comprehensive loss	6,166	(2,359)	(1,472)
Income tax	1,295	(496)	(515)
Other comprehensive loss	$ 4,871	$ (1,863)	$ (957)

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