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Variable Interest Entities (Details) (USD $)
1 Months Ended 6 Months Ended 1 Months Ended 6 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Jul. 31, 2011
ACT I [Member]
Jun. 30, 2012
ACT I [Member]
May 31, 2012
ACT II [Member]
Jun. 30, 2012
ACT II [Member]
Variable Interest Entities (Textual) [Abstract]            
Proceeds from issuance of trust preferred securities       $ 10,000,000   $ 25,000,000
Purchase of subordinated debt securities       10,310,000   25,780,000
Redemption of debt securities     10,310,000   12,890,000  
Subordinated debt securities: $ 12,890,000 $ 25,780,000     $ 12,890,000