Fair Value of Financial Instruments (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Fair Value of Financial Instruments [Abstract]
Impaired loan balance	$ 51,828,000	$ 56,049,000
Valuation allowances	7,594,000	12,994,000
Nonrecurring fair value measurements [Abstract]
Number of loans that did not require a specific reserve	7	13
Loans not requiring a specific reserve	4,669,000	5,134,000
Nonrecurring [Member]
Nonrecurring fair value measurements [Abstract]
Impaired loans	44,234,000	43,055,000
Foreclosed real estate	11,441,000	19,932,000
Total nonrecurring fair value measurements	55,675,000	62,987,000
Liabilities required to be remeasured on a non recurring basis	0	0
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
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
Level 3 [Member] | Nonrecurring [Member]
Nonrecurring fair value measurements [Abstract]
Impaired loans	44,234,000	43,055,000
Foreclosed real estate	11,441,000	19,932,000
Total nonrecurring fair value measurements	$ 55,675,000	$ 62,987,000