Fair Value Measurements (Details 1) (Fair Value, Measurements, Nonrecurring [Member], USD $)	Dec. 31, 2012	Dec. 31, 2011
Assets and liabilities measured at fair value on a nonrecurring basis
Impaired loans	$ 34,406,000	$ 44,915,000
Foreclosed assets	6,970,000	15,282,000
Total	41,376,000	60,197,000
Level 1 [Member]
Assets and liabilities measured at fair value on a nonrecurring basis
Impaired loans	0	0
Foreclosed assets	0	0
Total	0	0
Level 2 [Member]
Assets and liabilities measured at fair value on a nonrecurring basis
Impaired loans	0	0
Foreclosed assets	0	0
Total	0	0
Level 3 [Member]
Assets and liabilities measured at fair value on a nonrecurring basis
Impaired loans	34,406,000	44,915,000
Foreclosed assets	6,970,000	15,282,000
Total	$ 41,376,000	$ 60,197,000