Disclosures About Fair Value of Financial Instruments - Fair value measurements of assets and liabilities on recurring basis (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Available-for-sale securities
Investment securities available for sale	$ 117,333	$ 119,887
Fair Value | Fair Value, Measurements, Recurring
Available-for-sale securities
Investment securities available for sale	117,333	119,887
Fair Value | Fair Value, Measurements, Recurring | Federal agencies
Available-for-sale securities
Investment securities available for sale	33,338	37,213
Fair Value | Fair Value, Measurements, Recurring | State and municipal
Available-for-sale securities
Investment securities available for sale	35,014	37,122
Fair Value | Fair Value, Measurements, Recurring | Government-Sponsored Enterprise (GSE) Residential Mortgage-Backed and Other Asset-Backed Agency Securities
Available-for-sale securities
Investment securities available for sale	45,629	41,801
Fair Value | Fair Value, Measurements, Recurring | Corporate
Available-for-sale securities
Investment securities available for sale	3,352	3,751
Fair Value Measurements Using Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring
Available-for-sale securities
Investment securities available for sale
Fair Value Measurements Using Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring | Federal agencies
Available-for-sale securities
Investment securities available for sale
Fair Value Measurements Using Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring | State and municipal
Available-for-sale securities
Investment securities available for sale
Fair Value Measurements Using Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring | Government-Sponsored Enterprise (GSE) Residential Mortgage-Backed and Other Asset-Backed Agency Securities
Available-for-sale securities
Investment securities available for sale
Fair Value Measurements Using Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring | Corporate
Available-for-sale securities
Investment securities available for sale
Fair Value Measurements Using Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring
Available-for-sale securities
Investment securities available for sale	115,968	118,619
Fair Value Measurements Using Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Federal agencies
Available-for-sale securities
Investment securities available for sale	33,338	37,213
Fair Value Measurements Using Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | State and municipal
Available-for-sale securities
Investment securities available for sale	35,014	37,122
Fair Value Measurements Using Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Government-Sponsored Enterprise (GSE) Residential Mortgage-Backed and Other Asset-Backed Agency Securities
Available-for-sale securities
Investment securities available for sale	45,629	41,801
Fair Value Measurements Using Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Corporate
Available-for-sale securities
Investment securities available for sale	1,987	2,483
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Available-for-sale securities
Investment securities available for sale	1,365	1,268
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Federal agencies
Available-for-sale securities
Investment securities available for sale
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | State and municipal
Available-for-sale securities
Investment securities available for sale
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Government-Sponsored Enterprise (GSE) Residential Mortgage-Backed and Other Asset-Backed Agency Securities
Available-for-sale securities
Investment securities available for sale
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring | Corporate
Available-for-sale securities
Investment securities available for sale	$ 1,365	$ 1,268