Disclosures About Fair Value of Financial Instruments - Fair value measurements of assets and liabilities on recurring basis (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Available-for-sale securities
Investment securities available for sale	$ 119,887	$ 113,770
Fair Value | Fair Value, Measurements, Recurring
Available-for-sale securities
Investment securities available for sale	119,887	113,770
Fair Value | Fair Value, Measurements, Recurring | Federal agencies
Available-for-sale securities
Investment securities available for sale	37,213	43,409
Fair Value | Fair Value, Measurements, Recurring | State and municipal
Available-for-sale securities
Investment securities available for sale	37,122	31,162
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	41,801	36,022
Fair Value | Fair Value, Measurements, Recurring | Corporate
Available-for-sale securities
Investment securities available for sale	3,751	3,177
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	118,619	112,573
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	37,213	43,409
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	37,122	31,162
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	41,801	36,022
Fair Value Measurements Using Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring | Corporate
Available-for-sale securities
Investment securities available for sale	2,483	1,980
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Available-for-sale securities
Investment securities available for sale	1,268	1,197
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	$ 1,268	$ 1,197