Fair Values of Financial Instruments (Details) (USD $)	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011
Fair Values of Financial Instruments [Abstract]
Impaired loan balance	$ 38,573,000	$ 56,049,000
Valuation allowances	11,730,000	12,994,000
Nonrecurring fair value measurements [Abstract]
Liabilities required to be remeasured on a non recurring basis	0	0
Number of loans that did not require a specific reserve	6		11
Loans not requiring a specific reserve	4,095,000		4,237,000
Nonrecurring [Member]
Nonrecurring fair value measurements [Abstract]
Impaired loans	26,843,000	43,055,000
Foreclosed real estate	13,801,000	19,932,000
Total nonrecurring fair value measurements	40,644,000	62,987,000
Quoted Prices in Active Markets For Identical Assets (Level 1) [Member] | Nonrecurring [Member]
Nonrecurring fair value measurements [Abstract]
Impaired loans	0	0
Foreclosed real estate	0	0
Total nonrecurring fair value measurements	0	0
Significant Other Observable Inputs (Level 2) [Member] | Nonrecurring [Member]
Nonrecurring fair value measurements [Abstract]
Impaired loans	0	0
Foreclosed real estate	0	0
Total nonrecurring fair value measurements	0	0
Significant Unobservable Inputs (Level 3) [Member] | Nonrecurring [Member]
Nonrecurring fair value measurements [Abstract]
Impaired loans	26,843,000	43,055,000
Foreclosed real estate	13,801,000	19,932,000
Total nonrecurring fair value measurements	$ 40,644,000	$ 62,987,000