Investment Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Summary of investment securities
Available-for-sale Securities and Regulatory Stock, Amortized Cost	$ 138,669	$ 141,589
Available-for-sale Securities and Regulatory Stock, Gross Unrealized Gains	365	78
Available-for-sale Securities and Regulatory Stock, Gross Unrealized Losses	2,662	4,744
Available-for-sale securities and Regulatory Stock, Fair Value	136,372	136,923
U.S. Government agencies and corporations
Summary of investment securities
Available-for-sale Securities and Regulatory Stock, Amortized Cost	9,246	9,242
Available-for-sale Securities and Regulatory Stock, Gross Unrealized Gains	63	11
Available-for-sale Securities and Regulatory Stock, Gross Unrealized Losses	82	251
Available-for-sale securities and Regulatory Stock, Fair Value	9,227	9,002
Obligations of states and political subdivisions
Summary of investment securities
Available-for-sale Securities and Regulatory Stock, Amortized Cost	53,085	53,187
Available-for-sale Securities and Regulatory Stock, Gross Unrealized Gains	237	26
Available-for-sale Securities and Regulatory Stock, Gross Unrealized Losses	440	1,555
Available-for-sale securities and Regulatory Stock, Fair Value	52,882	51,658
U.S. Government-sponsored mortgage-backed securities
Summary of investment securities
Available-for-sale Securities and Regulatory Stock, Amortized Cost	57,147	59,070
Available-for-sale Securities and Regulatory Stock, Gross Unrealized Gains	7
Available-for-sale Securities and Regulatory Stock, Gross Unrealized Losses	1,764	2,483
Available-for-sale securities and Regulatory Stock, Fair Value	55,390	56,587
U.S. Government-sponsored collateralized mortgage obligations
Summary of investment securities
Available-for-sale Securities and Regulatory Stock, Amortized Cost	11,660	12,112
Available-for-sale Securities and Regulatory Stock, Gross Unrealized Gains	58	41
Available-for-sale Securities and Regulatory Stock, Gross Unrealized Losses	128	177
Available-for-sale securities and Regulatory Stock, Fair Value	11,590	11,976
U.S. Government-guaranteed small business administration pools
Summary of investment securities
Available-for-sale Securities and Regulatory Stock, Amortized Cost	7,531	7,978
Available-for-sale Securities and Regulatory Stock, Gross Unrealized Losses	248	278
Available-for-sale securities and Regulatory Stock, Fair Value	7,283	7,700
Federal Home Loan Bank (FHLB) stock
Summary of investment securities
Available-for-sale Securities and Regulatory Stock, Amortized Cost	2,355	2,355
Available-for-sale securities and Regulatory Stock, Fair Value	2,355	2,355
Federal Reserve Bank (FRB) stock
Summary of investment securities
Available-for-sale Securities and Regulatory Stock, Amortized Cost	226	226
Available-for-sale securities and Regulatory Stock, Fair Value	226	226
Total regulatory stock
Summary of investment securities
Available-for-sale Securities and Regulatory Stock, Amortized Cost	2,581	2,581
Available-for-sale securities and Regulatory Stock, Fair Value	$ 2,581	$ 2,581