Estimated Fair Value of Financial Instruments (Details 2) (Nonrecurring [Member], USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Balances of assets and liabilities measured at fair value on a nonrecurring basis
Impaired and nonaccrual loans	$ 29,569	$ 33,592
Other real estate	1,506	1,687
Total assets at fair value on a nonrecurring basis	31,075	35,279
Level 1 [Member]
Balances of assets and liabilities measured at fair value on a nonrecurring basis
Impaired and nonaccrual loans
Other real estate
Total assets at fair value on a nonrecurring basis
Level 2 [Member]
Balances of assets and liabilities measured at fair value on a nonrecurring basis
Impaired and nonaccrual loans
Other real estate
Total assets at fair value on a nonrecurring basis
Level 3 [Member]
Balances of assets and liabilities measured at fair value on a nonrecurring basis
Impaired and nonaccrual loans	29,569	33,592
Other real estate	1,506	1,687
Total assets at fair value on a nonrecurring basis	$ 31,075	$ 35,279