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Fair Value (Details Textual) (USD $)	3 Months Ended		12 Months Ended
Fair Value (Details Textual) (USD $)	Sep. 30, 2012	Dec. 31, 2011	Dec. 31, 2011
Fair Value (Textual) [Abstract]
Contractual amounts of written financial guarantees and letters of credit	$ 18,705,000	$ 19,841,000	$ 19,841,000
Written Down Due to Other Than Temporary Impairment Evident		1,100,000	1,100,000
Number of Sale of Private Label Collateralized Mortgage Obligation Securities	2
Number of Private Label Collateralized Mortgage Obligation Company Owns	0
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets Measured at Fair Value on a Recurring Basis	$ 0

This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

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