Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Components of income tax expense [Abstract]
Current income tax expense			$ 20	$ 179	$ 281
Deferred income tax benefit			(117)	(19)	(227)
Reported income tax expense (benefit)			(97)	160	54
Reconciliation of "expected" Federal income tax expense [Abstract]
Expected tax expense (34%)			(43)	1,345	1,254
Interest expense on tax-exempt assets			23	15	22
Low-income housing tax credits			(412)	(384)	(274)
Tax-exempt interest			(628)	(608)	(654)
Bank-owned life insurance			(263)	(270)	(301)
Impact of Tax Act			1,221	0	0
Other, net			5	62	7
Reported income tax expense (benefit)			$ (97)	$ 160	$ 54
Income Tax Disclosure [Line Items]
Expected tax expense rate			34.00%	34.00%	34.00%
Effective tax rate			77.00%	4.00%	1.50%
Additional income tax expense due to change in tax rate	$ 1,200
Deferred tax assets [Abstract]
Allowance for loan losses	1,984		$ 1,984	$ 2,803
Interest on nonaccrual loans	82		82	71
Other real estate owned	0		0	349
Pension - other comprehensive income	0		0	1,272
Bank owned life insurance benefit	55		55	94
Charitable contributions carried forward	2		2	1
Net unrealized loss on securities available-for-sale	225		225	896
Unexercised nonqualified options	0		0	36
Alternative minimum tax	1,344		1,344	1,019
Deferred benefits and compensation	139		139	256
Other	179		179	89
Total	4,010		4,010	6,886
Deferred tax liabilities [Abstract]
Depreciation	(404)		(404)	(822)
Accretion of discounts on securities	0		0	(1)
Deferred loan fees and costs	(295)		(295)	(325)
Pension	0		0	(740)
Total	(699)		(699)	(1,888)
Net deferred tax assets	$ 3,311		$ 3,311	$ 4,998
Maximum [Member]
Income Tax Disclosure [Line Items]
Expected tax expense rate			35.00%
Plan [Member]
Income Tax Disclosure [Line Items]
Expected tax expense rate		21.00%