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Federal Funds Purchased and Securities Sold under Agreements to Repurchase and Wholesale Borrowings (Details Narrative) (USD $)
 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2011
InterestRateOptions
Dec. 31, 2010
Dec. 31, 2011
Financial Institution One [Member]
Dec. 31, 2010
Financial Institution One [Member]
Dec. 31, 2011
Financial Institution One [Member]
Option One [Member]
Line of Credit [Member]
Dec. 31, 2011
Financial Institution One [Member]
Option Two [Member]
Line of Credit [Member]
Dec. 31, 2011
Financial Institution One [Member]
Option Two [Member]
Line of Credit [Member]
Component One [Member]
Dec. 31, 2011
Financial Institution One [Member]
Option Two [Member]
Line of Credit [Member]
Component Two [Member]
Dec. 31, 2011
Financial Institution Two [Member]
Dec. 31, 2010
Financial Institution Two [Member]
Dec. 31, 2011
Financial Institution Two [Member]
Option One [Member]
Line of Credit [Member]
Dec. 31, 2011
Financial Institution Two [Member]
Option Two [Member]
Line of Credit [Member]
Dec. 31, 2011
Financial Institution Two [Member]
Option Two [Member]
Line of Credit [Member]
Component One [Member]
Dec. 31, 2011
Financial Institution Two [Member]
Option Two [Member]
Line of Credit [Member]
Component Two [Member]
Dec. 31, 2011
Financial Institution Two [Member]
Option Two [Member]
Line of Credit [Member]
Component Three [Member]
Securities Sold under Agreements to Repurchase $ 902,300,000 $ 836,400,000                          
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged 4,700,000,000 4,600,000,000                          
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Interest Rate, Range from 1.48%                            
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Interest Rate, Range to 4.75%                            
Line of Credit Facility, Number Of Interest Rate Options 2                            
Line of Credit Facility, Maximum Borrowing Capacity     15,000,000 15,000,000         15,000,000 15,000,000          
Line of Credit Facility, Amount Outstanding $ 0 $ 0                          
Debt Instrument, Basis Spread on Variable Rate         2.00% 0.05%   0.05%     1.75% 0.05%   0.05% 1.00%
Debt Instrument, Description of Variable Rate Basis         LIBOR   Prime Rate Federal Funds Open Rate     LIBOR   Prime Rate Federal Funds Rate LIBOR