Income Taxes (Details 2) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Deferred tax assets:
Allowance for loan losses	$ 1,704	$ 1,473
Deferred expenses	767	717
Depreciation and amortization	79	105
Unrecognized pension liability	1,019	1,232
Postretirement liability	919	901
Deferred loss on OREO	187	83
Unrealized loss on securities	1,128	617
State tax NOLs	647	647
Other	198	232
Gross deferred tax assets	6,648	6,007
Deferred tax liabilities:
Prepaid expenses	(277)	(181)
Prepaid pension	(1,304)	(1,148)
Deferred loan fees	(135)	(65)
Mortgage servicing rights	(615)	(610)
Gross deferred tax liabilities	(2,331)	(2,004)
Net deferred tax asset	4,317	4,003
Deferred tax valuation allowance	(985)	(982)
Deferred tax assets, net of allowance	$ 3,332	$ 3,021