Fair Value Measurement, Assets and Liabilities Measured at Fair Value on Recurring and Nonrecurring Basis (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets available for sale securities [Abstract]
Total available-for sale securities	$ 363	$ 349
Interest rate swaps	0	0
Total financial assets	62,298	70,009
Liabilities [Abstract]
Interest rate swaps	0	0
Total financial liabilities	0	0
Significant Other Observable Inputs (Level 2) [Member]
Assets available for sale securities [Abstract]
Total available-for sale securities	47,404	46,965
Interest rate swaps	0	179
Total financial assets	508,637	526,953
Liabilities [Abstract]
Interest rate swaps	841	452
Total financial liabilities	553,098	567,425
Significant Other Unobservable Inputs (Level 3) [Member]
Assets available for sale securities [Abstract]
Total available-for sale securities	325	335
Interest rate swaps	0	0
Total financial assets	702	2,220
Liabilities [Abstract]
Interest rate swaps	0	0
Total financial liabilities	0	0
Financial Assets Measured at Fair Value on a Nonrecurring Basis [Abstract]
Impaired loans, net	377
Fair Value, Measurements, Recurring [Member]
Assets available for sale securities [Abstract]
Obligations of U.S. Government corporations and agencies	40,014	39,572
Obligations of states and political subdivisions	7,390	7,393
Corporate bonds	325	335
Mutual funds	363	349
Total available-for sale securities	48,092	47,649
Interest rate swaps	0	179
Total financial assets	48,092	47,828
Liabilities [Abstract]
Interest rate swaps	841	452
Total financial liabilities	841	452
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	363	349
Total available-for sale securities	363	349
Interest rate swaps	0	0
Total financial assets	363	349
Liabilities [Abstract]
Interest rate swaps	0	0
Total financial liabilities	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	40,014	39,572
Obligations of states and political subdivisions	7,390	7,393
Corporate bonds	0	0
Mutual funds	0	0
Total available-for sale securities	47,404	46,965
Interest rate swaps	0	179
Total financial assets	47,404	47,144
Liabilities [Abstract]
Interest rate swaps	841	452
Total financial liabilities	841	452
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	325	335
Mutual funds	0	0
Total available-for sale securities	325	335
Interest rate swaps	0	0
Total financial assets	325	335
Liabilities [Abstract]
Interest rate swaps	0	0
Total financial liabilities	0	0
Fair Value, Measurements, Nonrecurring [Member]
Financial Assets Measured at Fair Value on a Nonrecurring Basis [Abstract]
Impaired loans, net	868	1,855
Other real estate owned, net	1,406	1,776
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	491	0
Other real estate owned, net	1,406	0
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	377	1,855
Other real estate owned, net	$ 0	$ 1,776