Schedule of Financial and Non-financial Assets, Fair Value Hierarchy (Details) (USD $)				12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2011	Dec. 31, 2012 Fair value measured on a nonrecurring basis	Dec. 31, 2011 Fair value measured on a nonrecurring basis	Dec. 31, 2012 Fair value measured on a nonrecurring basis Level 1	Dec. 31, 2011 Fair value measured on a nonrecurring basis Level 1	Dec. 31, 2012 Fair value measured on a nonrecurring basis Level 2	Dec. 31, 2011 Fair value measured on a nonrecurring basis Level 2	Dec. 31, 2012 Fair value measured on a nonrecurring basis Level 3	Dec. 31, 2011 Fair value measured on a nonrecurring basis Level 3
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis
Discount Applied to Real Estate Appraisal Value to Allow for Selling Expenses		10.00%
Change in fair value of impaired loans				$ 3,000,000	$ 12,100,000
Change in fair value of other real estate owned				2,000,000	2,800,000
Impaired loans (collateral-dependent)	46,584,000		52,920,000	10,292,000	17,180,000	0	0	0	0	10,292,000	17,180,000
Other real estate owned				$ 2,492,000	$ 2,462,000	$ 0	$ 0	$ 0	$ 0	$ 2,492,000	$ 2,462,000