Estimated Fair Value of Financial Instruments - Assets Measured by Fair Value on a Recurring Basis (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
U.S. Government agencies and corporations
Fair Value Of Other Financial Instrument [Line Items]
Assets, Fair Value Disclosure, Recurring	$ 59,330
Mortgage backed securities: residential
Fair Value Of Other Financial Instrument [Line Items]
Assets, Fair Value Disclosure, Recurring	98,554
Residential collateralized mortgage obligations
Fair Value Of Other Financial Instrument [Line Items]
Assets, Fair Value Disclosure, Recurring	25,152
State and political subdivisions
Fair Value Of Other Financial Instrument [Line Items]
Assets, Fair Value Disclosure, Recurring	35,811
Fair Value [Member]
Fair Value Of Other Financial Instrument [Line Items]
Assets, Fair Value Disclosure, Recurring	218,847	216,344
Fair Value [Member] | U.S. Government agencies and corporations
Fair Value Of Other Financial Instrument [Line Items]
Assets, Fair Value Disclosure, Recurring	59,330	65,388
Fair Value [Member] | Mortgage backed securities: residential
Fair Value Of Other Financial Instrument [Line Items]
Assets, Fair Value Disclosure, Recurring	98,554	94,430
Fair Value [Member] | Residential collateralized mortgage obligations
Fair Value Of Other Financial Instrument [Line Items]
Assets, Fair Value Disclosure, Recurring	25,152	18,655
Fair Value [Member] | State and political subdivisions
Fair Value Of Other Financial Instrument [Line Items]
Assets, Fair Value Disclosure, Recurring	35,811	32,965
Fair Value [Member] | Preferred securities
Fair Value Of Other Financial Instrument [Line Items]
Assets, Fair Value Disclosure, Recurring		4,684
Fair Value [Member] | Interest rate swaps
Fair Value Of Other Financial Instrument [Line Items]
Assets, Fair Value Disclosure, Recurring		222
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value Of Other Financial Instrument [Line Items]
Assets, Fair Value Disclosure, Recurring	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]
Assets, Fair Value Disclosure, Recurring	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]
Assets, Fair Value Disclosure, Recurring	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]
Assets, Fair Value Disclosure, Recurring	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]
Assets, Fair Value Disclosure, Recurring	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Preferred securities
Fair Value Of Other Financial Instrument [Line Items]
Assets, Fair Value Disclosure, Recurring		0
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Interest rate swaps
Fair Value Of Other Financial Instrument [Line Items]
Assets, Fair Value Disclosure, Recurring		0
Significant Other Observable Inputs (Level 2) [Member]
Fair Value Of Other Financial Instrument [Line Items]
Assets, Fair Value Disclosure, Recurring	218,847	211,660
Significant Other Observable Inputs (Level 2) [Member] | U.S. Government agencies and corporations
Fair Value Of Other Financial Instrument [Line Items]
Assets, Fair Value Disclosure, Recurring	59,330	65,388
Significant Other Observable Inputs (Level 2) [Member] | Mortgage backed securities: residential
Fair Value Of Other Financial Instrument [Line Items]
Assets, Fair Value Disclosure, Recurring	98,554	94,430
Significant Other Observable Inputs (Level 2) [Member] | Residential collateralized mortgage obligations
Fair Value Of Other Financial Instrument [Line Items]
Assets, Fair Value Disclosure, Recurring	25,152	18,655
Significant Other Observable Inputs (Level 2) [Member] | State and political subdivisions
Fair Value Of Other Financial Instrument [Line Items]
Assets, Fair Value Disclosure, Recurring	35,811	32,965
Significant Other Observable Inputs (Level 2) [Member] | Preferred securities
Fair Value Of Other Financial Instrument [Line Items]
Assets, Fair Value Disclosure, Recurring		0
Significant Other Observable Inputs (Level 2) [Member] | Interest rate swaps
Fair Value Of Other Financial Instrument [Line Items]
Assets, Fair Value Disclosure, Recurring		222
Significant Unobservable Inputs (Level 3) [Member]
Fair Value Of Other Financial Instrument [Line Items]
Assets, Fair Value Disclosure, Recurring		4,684
Significant Unobservable Inputs (Level 3) [Member] | U.S. Government agencies and corporations
Fair Value Of Other Financial Instrument [Line Items]
Assets, Fair Value Disclosure, Recurring	0	0
Significant Unobservable Inputs (Level 3) [Member] | Mortgage backed securities: residential
Fair Value Of Other Financial Instrument [Line Items]
Assets, Fair Value Disclosure, Recurring	0	0
Significant Unobservable Inputs (Level 3) [Member] | Residential collateralized mortgage obligations
Fair Value Of Other Financial Instrument [Line Items]
Assets, Fair Value Disclosure, Recurring	0	0
Significant Unobservable Inputs (Level 3) [Member] | State and political subdivisions
Fair Value Of Other Financial Instrument [Line Items]
Assets, Fair Value Disclosure, Recurring	0	0
Significant Unobservable Inputs (Level 3) [Member] | Preferred securities
Fair Value Of Other Financial Instrument [Line Items]
Assets, Fair Value Disclosure, Recurring		4,684
Significant Unobservable Inputs (Level 3) [Member] | Interest rate swaps
Fair Value Of Other Financial Instrument [Line Items]
Assets, Fair Value Disclosure, Recurring		$ 0