Income Taxes (Schedule of tax effects of temporary differences of the deferred tax assets and deferred tax liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets:
Allowance for loan losses	$ 1,608	$ 1,794
Deferred expenses	937	783
Unrecognized pension liability	1,038	1,179
Postretirement liability	932	914
Deferred loss on OREO	187	187
Unrealized loss on securities	53	685
State tax NOLs	870	779
Other	201	134
Gross deferred tax assets	5,826	6,455
Deferred tax liabilities:
Prepaid expenses	(209)	(241)
Prepaid pension	(1,248)	(1,305)
Deferred loan fees	(207)	(170)
Depreciation and amortization	(104)	(105)
Mortgage servicing rights	(601)	(615)
Gross deferred tax liabilities	(2,369)	(2,436)
Net deferred tax asset	3,457	4,019
Deferred tax valuation allowance	(1,202)	(1,085)
Deferred tax assets, net of allowance	$ 2,255	$ 2,934