Estimated Fair Value of Financial Instruments - Assets Measured by Fair Value on a Recurring Basis (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Fair Value Of Other Financial Instrument [Line Items]
Securities available for sale, at fair value (Note 4)	$ 219,422	$ 216,122
Fair Value [Member]
Fair Value Of Other Financial Instrument [Line Items]
Securities available for sale, at fair value (Note 4)	219,543	216,344
Fair Value [Member] | U.S. Government agencies and corporations
Fair Value Of Other Financial Instrument [Line Items]
Securities available for sale, at fair value (Note 4)	58,631	65,388
Fair Value [Member] | Mortgage backed securities: residential
Fair Value Of Other Financial Instrument [Line Items]
Securities available for sale, at fair value (Note 4)	99,531	94,430
Fair Value [Member] | Residential collateralized mortgage obligations
Fair Value Of Other Financial Instrument [Line Items]
Securities available for sale, at fair value (Note 4)	26,988	18,655
Fair Value [Member] | State and political subdivisions
Fair Value Of Other Financial Instrument [Line Items]
Securities available for sale, at fair value (Note 4)	34,272	32,965
Fair Value [Member] | Preferred securities
Fair Value Of Other Financial Instrument [Line Items]
Securities available for sale, at fair value (Note 4)		4,684
Fair Value [Member] | Interest rate swaps
Fair Value Of Other Financial Instrument [Line Items]
Securities available for sale, at fair value (Note 4)	121	222
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value Of Other Financial Instrument [Line Items]
Securities available for sale, at fair value (Note 4)	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | U.S. Government agencies and corporations
Fair Value Of Other Financial Instrument [Line Items]
Securities available for sale, at fair value (Note 4)	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Mortgage backed securities: residential
Fair Value Of Other Financial Instrument [Line Items]
Securities available for sale, at fair value (Note 4)	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Residential collateralized mortgage obligations
Fair Value Of Other Financial Instrument [Line Items]
Securities available for sale, at fair value (Note 4)	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | State and political subdivisions
Fair Value Of Other Financial Instrument [Line Items]
Securities available for sale, at fair value (Note 4)	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Preferred securities
Fair Value Of Other Financial Instrument [Line Items]
Securities available for sale, at fair value (Note 4)		0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Interest rate swaps
Fair Value Of Other Financial Instrument [Line Items]
Securities available for sale, at fair value (Note 4)	0	0
Significant Other Observable Inputs (Level 2) [Member]
Fair Value Of Other Financial Instrument [Line Items]
Securities available for sale, at fair value (Note 4)	219,543	211,660
Significant Other Observable Inputs (Level 2) [Member] | U.S. Government agencies and corporations
Fair Value Of Other Financial Instrument [Line Items]
Securities available for sale, at fair value (Note 4)	58,631	65,388
Significant Other Observable Inputs (Level 2) [Member] | Mortgage backed securities: residential
Fair Value Of Other Financial Instrument [Line Items]
Securities available for sale, at fair value (Note 4)	99,531	94,430
Significant Other Observable Inputs (Level 2) [Member] | Residential collateralized mortgage obligations
Fair Value Of Other Financial Instrument [Line Items]
Securities available for sale, at fair value (Note 4)	26,988	18,655
Significant Other Observable Inputs (Level 2) [Member] | State and political subdivisions
Fair Value Of Other Financial Instrument [Line Items]
Securities available for sale, at fair value (Note 4)	34,272	32,965
Significant Other Observable Inputs (Level 2) [Member] | Preferred securities
Fair Value Of Other Financial Instrument [Line Items]
Securities available for sale, at fair value (Note 4)		0
Significant Other Observable Inputs (Level 2) [Member] | Interest rate swaps
Fair Value Of Other Financial Instrument [Line Items]
Securities available for sale, at fair value (Note 4)	121	222
Significant Unobservable Inputs (Level 3) [Member]
Fair Value Of Other Financial Instrument [Line Items]
Securities available for sale, at fair value (Note 4)		4,684
Significant Unobservable Inputs (Level 3) [Member] | U.S. Government agencies and corporations
Fair Value Of Other Financial Instrument [Line Items]
Securities available for sale, at fair value (Note 4)	0	0
Significant Unobservable Inputs (Level 3) [Member] | Mortgage backed securities: residential
Fair Value Of Other Financial Instrument [Line Items]
Securities available for sale, at fair value (Note 4)	0	0
Significant Unobservable Inputs (Level 3) [Member] | Residential collateralized mortgage obligations
Fair Value Of Other Financial Instrument [Line Items]
Securities available for sale, at fair value (Note 4)	0	0
Significant Unobservable Inputs (Level 3) [Member] | State and political subdivisions
Fair Value Of Other Financial Instrument [Line Items]
Securities available for sale, at fair value (Note 4)	0	0
Significant Unobservable Inputs (Level 3) [Member] | Preferred securities
Fair Value Of Other Financial Instrument [Line Items]
Securities available for sale, at fair value (Note 4)		4,684
Significant Unobservable Inputs (Level 3) [Member] | Interest rate swaps
Fair Value Of Other Financial Instrument [Line Items]
Securities available for sale, at fair value (Note 4)	$ 0	$ 0