Fair Value Measurements (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Impaired loans (less specific allowance) [Member]
Assets measured at fair value on a nonrecurring basis
Total Fair Value	$ 40,852	$ 46,243
Foreclosed assets [Member]
Assets measured at fair value on a nonrecurring basis
Total Fair Value	326	403
Gains (Losses)	13	(1)
Other real estate owned [Member]
Assets measured at fair value on a nonrecurring basis
Total Fair Value	9,098	12,005
Gains (Losses)	(87)	(154)
Level 1 [Member] | Impaired loans (less specific allowance) [Member]
Assets measured at fair value on a nonrecurring basis
Total Fair Value
Level 1 [Member] | Foreclosed assets [Member]
Assets measured at fair value on a nonrecurring basis
Total Fair Value
Level 1 [Member] | Other real estate owned [Member]
Assets measured at fair value on a nonrecurring basis
Total Fair Value
Level 2 [Member] | Impaired loans (less specific allowance) [Member]
Assets measured at fair value on a nonrecurring basis
Total Fair Value
Level 2 [Member] | Foreclosed assets [Member]
Assets measured at fair value on a nonrecurring basis
Total Fair Value
Level 2 [Member] | Other real estate owned [Member]
Assets measured at fair value on a nonrecurring basis
Total Fair Value
Level 3 [Member] | Impaired loans (less specific allowance) [Member]
Assets measured at fair value on a nonrecurring basis
Total Fair Value	40,852	46,243
Level 3 [Member] | Foreclosed assets [Member]
Assets measured at fair value on a nonrecurring basis
Total Fair Value	326	403
Level 3 [Member] | Other real estate owned [Member]
Assets measured at fair value on a nonrecurring basis
Total Fair Value	$ 9,098	$ 12,005