Fair Value (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Assets measured at fair value on a recurring basis
Securities available for sale	$ 369,919	$ 389,829
Fair Value, Measurements, Recurring
Assets measured at fair value on a recurring basis
Securities available for sale	369,919	389,829
Yield maintenance provisions	1,012	638
Corporate bonds
Assets measured at fair value on a recurring basis
Securities available for sale	941	931
Corporate bonds | Fair Value, Measurements, Recurring
Assets measured at fair value on a recurring basis
Securities available for sale	941	931
U.S. Treasury and U.S. government sponsored entities
Assets measured at fair value on a recurring basis
Securities available for sale	19,206	24,821
U.S. Treasury and U.S. government sponsored entities | Fair Value, Measurements, Recurring
Assets measured at fair value on a recurring basis
Securities available for sale	19,206	24,821
State and political subdivisions
Assets measured at fair value on a recurring basis
Securities available for sale	95,578	91,881
State and political subdivisions | Fair Value, Measurements, Recurring
Assets measured at fair value on a recurring basis
Securities available for sale	95,578	91,881
Mortgage-backed securities - residential
Assets measured at fair value on a recurring basis
Securities available for sale	218,304	224,362
Mortgage-backed securities - residential | Fair Value, Measurements, Recurring
Assets measured at fair value on a recurring basis
Securities available for sale	218,304	224,362
Collateralized mortgage obligations
Assets measured at fair value on a recurring basis
Securities available for sale	14,365	25,175
Collateralized mortgage obligations | Fair Value, Measurements, Recurring
Assets measured at fair value on a recurring basis
Securities available for sale	14,365	25,175
Small Business Administration
Assets measured at fair value on a recurring basis
Securities available for sale	21,283	22,419
Small Business Administration | Fair Value, Measurements, Recurring
Assets measured at fair value on a recurring basis
Securities available for sale	21,283	22,419
Equity securities
Assets measured at fair value on a recurring basis
Securities available for sale	242	240
Equity securities | Fair Value, Measurements, Recurring
Assets measured at fair value on a recurring basis
Securities available for sale	242	240
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring
Assets measured at fair value on a recurring basis
Securities available for sale	242	240
Yield maintenance provisions	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate bonds | Fair Value, Measurements, Recurring
Assets measured at fair value on a recurring basis
Securities available for sale	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Treasury and U.S. government sponsored entities | Fair Value, Measurements, Recurring
Assets measured at fair value on a recurring basis
Securities available for sale	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | State and political subdivisions | Fair Value, Measurements, Recurring
Assets measured at fair value on a recurring basis
Securities available for sale	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Mortgage-backed securities - residential | Fair Value, Measurements, Recurring
Assets measured at fair value on a recurring basis
Securities available for sale	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Collateralized mortgage obligations | Fair Value, Measurements, Recurring
Assets measured at fair value on a recurring basis
Securities available for sale	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Small Business Administration | Fair Value, Measurements, Recurring
Assets measured at fair value on a recurring basis
Securities available for sale	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity securities | Fair Value, Measurements, Recurring
Assets measured at fair value on a recurring basis
Securities available for sale	242	240
Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring
Assets measured at fair value on a recurring basis
Securities available for sale	369,668	389,579
Yield maintenance provisions	1,012	638
Significant Other Observable Inputs (Level 2) | Corporate bonds | Fair Value, Measurements, Recurring
Assets measured at fair value on a recurring basis
Securities available for sale	941	931
Significant Other Observable Inputs (Level 2) | U.S. Treasury and U.S. government sponsored entities | Fair Value, Measurements, Recurring
Assets measured at fair value on a recurring basis
Securities available for sale	19,206	24,821
Significant Other Observable Inputs (Level 2) | State and political subdivisions | Fair Value, Measurements, Recurring
Assets measured at fair value on a recurring basis
Securities available for sale	95,578	91,881
Significant Other Observable Inputs (Level 2) | Mortgage-backed securities - residential | Fair Value, Measurements, Recurring
Assets measured at fair value on a recurring basis
Securities available for sale	218,295	224,352
Significant Other Observable Inputs (Level 2) | Collateralized mortgage obligations | Fair Value, Measurements, Recurring
Assets measured at fair value on a recurring basis
Securities available for sale	14,365	25,175
Significant Other Observable Inputs (Level 2) | Small Business Administration | Fair Value, Measurements, Recurring
Assets measured at fair value on a recurring basis
Securities available for sale	21,283	22,419
Significant Other Observable Inputs (Level 2) | Equity securities | Fair Value, Measurements, Recurring
Assets measured at fair value on a recurring basis
Securities available for sale	0	0
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Assets measured at fair value on a recurring basis
Securities available for sale	9	10
Yield maintenance provisions	0	0
Significant Unobservable Inputs (Level 3) | Corporate bonds | Fair Value, Measurements, Recurring
Assets measured at fair value on a recurring basis
Securities available for sale	0	0
Significant Unobservable Inputs (Level 3) | U.S. Treasury and U.S. government sponsored entities | Fair Value, Measurements, Recurring
Assets measured at fair value on a recurring basis
Securities available for sale	0	0
Significant Unobservable Inputs (Level 3) | State and political subdivisions | Fair Value, Measurements, Recurring
Assets measured at fair value on a recurring basis
Securities available for sale	0	0
Significant Unobservable Inputs (Level 3) | Mortgage-backed securities - residential | Fair Value, Measurements, Recurring
Assets measured at fair value on a recurring basis
Securities available for sale	9	10
Significant Unobservable Inputs (Level 3) | Collateralized mortgage obligations | Fair Value, Measurements, Recurring
Assets measured at fair value on a recurring basis
Securities available for sale	0	0
Significant Unobservable Inputs (Level 3) | Small Business Administration | Fair Value, Measurements, Recurring
Assets measured at fair value on a recurring basis
Securities available for sale	0	0
Significant Unobservable Inputs (Level 3) | Equity securities | Fair Value, Measurements, Recurring
Assets measured at fair value on a recurring basis
Securities available for sale	0	0
Interest rate swaps | Fair Value, Measurements, Recurring
Assets measured at fair value on a recurring basis
Derivative assets	1,012	638
Interest rate swaps | Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair Value, Measurements, Recurring
Assets measured at fair value on a recurring basis
Derivative assets	0	0
Interest rate swaps | Significant Other Observable Inputs (Level 2) | Fair Value, Measurements, Recurring
Assets measured at fair value on a recurring basis
Derivative assets	1,012	638
Interest rate swaps | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Assets measured at fair value on a recurring basis
Derivative assets	$ 0	$ 0