Investment Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Summary of investment securities
Available-for-sale Securities and Regulatory Stock, Amortized Cost	$ 144,530	$ 162,102
Available-for-sale Securities and Regulatory Stock, Gross Unrealized Gains	12	747
Available-for-sale Securities and Regulatory Stock, Gross Unrealized Losses	6,697	3,008
Available-for-sale securities and Regulatory Stock, Fair Value	137,845	159,841
U.S. Government agencies and corporations
Summary of investment securities
Available-for-sale Securities and Regulatory Stock, Amortized Cost	9,238	3,344
Available-for-sale Securities and Regulatory Stock, Gross Unrealized Gains		1
Available-for-sale Securities and Regulatory Stock, Gross Unrealized Losses	416	140
Available-for-sale securities and Regulatory Stock, Fair Value	8,822	3,205
Obligations of states and political subdivisions
Summary of investment securities
Available-for-sale Securities and Regulatory Stock, Amortized Cost	53,351	71,700
Available-for-sale Securities and Regulatory Stock, Gross Unrealized Gains	12	740
Available-for-sale Securities and Regulatory Stock, Gross Unrealized Losses	2,411	324
Available-for-sale securities and Regulatory Stock, Fair Value	50,952	72,116
U.S. Government-sponsored mortgage-backed securities
Summary of investment securities
Available-for-sale Securities and Regulatory Stock, Amortized Cost	61,145	69,066
Available-for-sale Securities and Regulatory Stock, Gross Unrealized Gains		6
Available-for-sale Securities and Regulatory Stock, Gross Unrealized Losses	3,123	1,404
Available-for-sale securities and Regulatory Stock, Fair Value	58,022	67,668
U.S. Government-sponsored collateralized mortgage obligations
Summary of investment securities
Available-for-sale Securities and Regulatory Stock, Amortized Cost	12,575	6,463
Available-for-sale Securities and Regulatory Stock, Gross Unrealized Losses	321	161
Available-for-sale securities and Regulatory Stock, Fair Value	12,254	6,302
U.S. Government-guaranteed small business administration pools
Summary of investment securities
Available-for-sale Securities and Regulatory Stock, Amortized Cost	8,221	9,911
Available-for-sale Securities and Regulatory Stock, Gross Unrealized Losses	426	256
Available-for-sale securities and Regulatory Stock, Fair Value	7,795	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