Fair Value Measurements (Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis) (Details) (Nonrecurring [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	$ 8,937	$ 9,550
Property acquired through foreclosure or repossession	1,170	1,073
Total sssets at fair value on a nonrecurring basis	10,107	10,623
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	0	0
Property acquired through foreclosure or repossession	0	0
Total sssets at fair value on a nonrecurring basis	0	0
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	0	0
Property acquired through foreclosure or repossession	0	0
Total sssets at fair value on a nonrecurring basis	0	0
Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral dependent impaired loans	8,937	9,550
Property acquired through foreclosure or repossession	1,170	1,073
Total sssets at fair value on a nonrecurring basis	$ 10,107	$ 10,623