Fair Values of Financial Instruments - Assets Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale	$ 101,560	$ 112,981
U.S. Treasury and federal agency
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale	4,500	1,466
U.S. government sponsored entities and agencies
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale	8,998	8,953
U.S. agency mortgage-backed securities: residential
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale	25,626	33,150
U.S. agency collateralized mortgage obligations: residential
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale	24,706	31,440
State and political subdivision
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale	27,608	28,591
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale	7,932	7,487
Equity securities
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale	2,190	1,894
Level 1
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale	6,554	3,286
Level 1 | U.S. Treasury and federal agency
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale	4,500	1,466
Level 1 | U.S. government sponsored entities and agencies
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale	0	0
Level 1 | U.S. agency mortgage-backed securities: residential
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale	0	0
Level 1 | U.S. agency collateralized mortgage obligations: residential
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale	0	0
Level 1 | State and political subdivision
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale	0	0
Level 1 | Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale	0	0
Level 1 | Equity securities
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale	2,054	1,820
Level 2
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale	94,870	109,621
Level 2 | U.S. Treasury and federal agency
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale	0	0
Level 2 | U.S. government sponsored entities and agencies
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale	8,998	8,953
Level 2 | U.S. agency mortgage-backed securities: residential
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale	25,626	33,150
Level 2 | U.S. agency collateralized mortgage obligations: residential
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale	24,706	31,440
Level 2 | State and political subdivision
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale	27,608	28,591
Level 2 | Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale	7,932	7,487
Level 2 | Equity securities
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale	0	0
Level 3
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale	136	74
Level 3 | U.S. Treasury and federal agency
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale	0	0
Level 3 | U.S. government sponsored entities and agencies
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale	0	0
Level 3 | U.S. agency mortgage-backed securities: residential
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale	0	0
Level 3 | U.S. agency collateralized mortgage obligations: residential
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale	0	0
Level 3 | State and political subdivision
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale	0	0
Level 3 | Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale	0	0
Level 3 | Equity securities
Schedule of Available-for-sale Securities [Line Items]
Securities available for sale	$ 136	$ 74