Investment Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Summary of investment securities
Available-for-sale Securities and Regulatory Stock, Amortized Cost	$ 146,827	$ 162,102
Available-for-sale Securities and Regulatory Stock, Gross Unrealized Gains	19	747
Available-for-sale Securities and Regulatory Stock, Gross Unrealized Losses	5,308	3,008
Available-for-sale securities and Regulatory Stock, Fair Value	141,538	159,841
U.S. Government agencies and corporations
Summary of investment securities
Available-for-sale Securities and Regulatory Stock, Amortized Cost	9,235	3,344
Available-for-sale Securities and Regulatory Stock, Gross Unrealized Gains		1
Available-for-sale Securities and Regulatory Stock, Gross Unrealized Losses	283	140
Available-for-sale securities and Regulatory Stock, Fair Value	8,952	3,205
Obligations of states and political subdivisions
Summary of investment securities
Available-for-sale Securities and Regulatory Stock, Amortized Cost	53,452	71,700
Available-for-sale Securities and Regulatory Stock, Gross Unrealized Gains	19	740
Available-for-sale Securities and Regulatory Stock, Gross Unrealized Losses	1,690	324
Available-for-sale securities and Regulatory Stock, Fair Value	51,781	72,116
U.S. Government-sponsored mortgage-backed securities
Summary of investment securities
Available-for-sale Securities and Regulatory Stock, Amortized Cost	62,175	69,066
Available-for-sale Securities and Regulatory Stock, Gross Unrealized Gains		6
Available-for-sale Securities and Regulatory Stock, Gross Unrealized Losses	2,717	1,404
Available-for-sale securities and Regulatory Stock, Fair Value	59,458	67,668
U.S. Government-sponsored collateralized mortgage obligations
Summary of investment securities
Available-for-sale Securities and Regulatory Stock, Amortized Cost	13,119	6,463
Available-for-sale Securities and Regulatory Stock, Gross Unrealized Losses	236	161
Available-for-sale securities and Regulatory Stock, Fair Value	12,883	6,302
U.S. Government-guaranteed small business administration pools
Summary of investment securities
Available-for-sale Securities and Regulatory Stock, Amortized Cost	8,846	9,911
Available-for-sale Securities and Regulatory Stock, Gross Unrealized Losses	382	256
Available-for-sale securities and Regulatory Stock, Fair Value	8,464	9,655
Trust preferred securities
Summary of investment securities
Available-for-sale Securities and Regulatory Stock, Amortized Cost		1,618
Available-for-sale Securities and Regulatory Stock, Gross Unrealized Losses		723
Available-for-sale securities and Regulatory Stock, Fair Value		895
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