Fair Value Measurement, Assets and Liabilities Measured at Fair Value on Recurring and Nonrecurring Basis (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets available for sale securities [Abstract]
Total available-for sale securities	$ 352	$ 363
Interest rate swaps	0	0
Total assets at fair value	54,024	64,828
Liabilities [Abstract]
Interest rate swaps	0	0
Total liabilities at fair value	0	0
Significant Other Observable Inputs (Level 2) [Member]
Assets available for sale securities [Abstract]
Total available-for sale securities	49,308	47,404
Interest rate swaps	54	0
Total assets at fair value	511,535	506,107
Liabilities [Abstract]
Interest rate swaps	345	841
Total liabilities at fair value	542,078	553,099
Significant Other Unobservable Inputs (Level 3) [Member]
Assets available for sale securities [Abstract]
Total available-for sale securities	440	325
Interest rate swaps	0	0
Total assets at fair value	697	702
Liabilities [Abstract]
Interest rate swaps	0	0
Total liabilities at fair value	0	0
Fair Value, Measurements, Recurring [Member]
Assets available for sale securities [Abstract]
Obligations of U.S. Government corporations and agencies	42,230	40,014
Obligations of states and political subdivisions	7,078	7,390
Corporate bonds	440	325
Mutual funds	352	363
Total available-for sale securities	50,100	48,092
Interest rate swaps	54	0
Total assets at fair value	50,154	48,092
Liabilities [Abstract]
Interest rate swaps	345	841
Total liabilities at fair value	345	841
Fair Value, Measurements, Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets available for sale securities [Abstract]
Obligations of U.S. Government corporations and agencies	0	0
Obligations of states and political subdivisions	0	0
Corporate bonds	0	0
Mutual funds	352	363
Total available-for sale securities	352	363
Interest rate swaps	0	0
Total assets at fair value	352	363
Liabilities [Abstract]
Interest rate swaps	0	0
Total liabilities at fair value	0	0
Fair Value, Measurements, Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets available for sale securities [Abstract]
Obligations of U.S. Government corporations and agencies	42,230	40,014
Obligations of states and political subdivisions	7,078	7,390
Corporate bonds	0	0
Mutual funds	0	0
Total available-for sale securities	49,308	47,404
Interest rate swaps	54	0
Total assets at fair value	49,362	47,404
Liabilities [Abstract]
Interest rate swaps	345	841
Total liabilities at fair value	345	841
Fair Value, Measurements, Recurring [Member] | Significant Other Unobservable Inputs (Level 3) [Member]
Assets available for sale securities [Abstract]
Obligations of U.S. Government corporations and agencies	0	0
Obligations of states and political subdivisions	0	0
Corporate bonds	440	325
Mutual funds	0	0
Total available-for sale securities	440	325
Interest rate swaps	0	0
Total assets at fair value	440	325
Liabilities [Abstract]
Interest rate swaps	0	0
Total liabilities at fair value	0	0
Fair Value, Measurements, Nonrecurring [Member]
Financial Assets Measured at Fair Value on a Nonrecurring Basis [Abstract]
Impaired loans, net	4,690	868
Other real estate owned, net	1,406	1,406
Fair Value, Measurements, Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial Assets Measured at Fair Value on a Nonrecurring Basis [Abstract]
Impaired loans, net	0	0
Other real estate owned, net	0	0
Fair Value, Measurements, Nonrecurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Financial Assets Measured at Fair Value on a Nonrecurring Basis [Abstract]
Impaired loans, net	4,433	491
Other real estate owned, net	1,406	1,406
Fair Value, Measurements, Nonrecurring [Member] | Significant Other Unobservable Inputs (Level 3) [Member]
Financial Assets Measured at Fair Value on a Nonrecurring Basis [Abstract]
Impaired loans, net	257	377
Other real estate owned, net	$ 0	$ 0