Fair Values (Details 3) (Nonrecurring basis [Member], USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Assets and liabilities measured at fair value on a nonrecurring basis
Total assets measured at fair value	$ 4,403	$ 14,198
Impaired loans [Member]
Assets and liabilities measured at fair value on a nonrecurring basis
Total assets measured at fair value	2,278	9,713
Mortgage loans held-for-sale [Member]
Assets and liabilities measured at fair value on a nonrecurring basis
Total assets measured at fair value		1,426
Other real estate owned [Member]
Assets and liabilities measured at fair value on a nonrecurring basis
Total assets measured at fair value	2,125	3,059
Level 1 [Member]
Assets and liabilities measured at fair value on a nonrecurring basis
Total assets measured at fair value	0	0
Level 1 [Member] | Impaired loans [Member]
Assets and liabilities measured at fair value on a nonrecurring basis
Total assets measured at fair value	0	0
Level 1 [Member] | Mortgage loans held-for-sale [Member]
Assets and liabilities measured at fair value on a nonrecurring basis
Total assets measured at fair value		0
Level 1 [Member] | Other real estate owned [Member]
Assets and liabilities measured at fair value on a nonrecurring basis
Total assets measured at fair value	0	0
Level 2 [Member]
Assets and liabilities measured at fair value on a nonrecurring basis
Total assets measured at fair value	0	0
Level 2 [Member] | Impaired loans [Member]
Assets and liabilities measured at fair value on a nonrecurring basis
Total assets measured at fair value	0	0
Level 2 [Member] | Mortgage loans held-for-sale [Member]
Assets and liabilities measured at fair value on a nonrecurring basis
Total assets measured at fair value		0
Level 2 [Member] | Other real estate owned [Member]
Assets and liabilities measured at fair value on a nonrecurring basis
Total assets measured at fair value	0	0
Level 3 [Member]
Assets and liabilities measured at fair value on a nonrecurring basis
Total assets measured at fair value	4,403	14,198
Level 3 [Member] | Impaired loans [Member]
Assets and liabilities measured at fair value on a nonrecurring basis
Total assets measured at fair value	2,278	9,713
Level 3 [Member] | Mortgage loans held-for-sale [Member]
Assets and liabilities measured at fair value on a nonrecurring basis
Total assets measured at fair value		1,426
Level 3 [Member] | Other real estate owned [Member]
Assets and liabilities measured at fair value on a nonrecurring basis
Total assets measured at fair value	$ 2,125	$ 3,059