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Fair Values of Assets and Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2012
Probability of Default [Member]
Jun. 30, 2012
Probability of Default [Member]
Minimum [Member]
Jun. 30, 2012
Probability of Default [Member]
Maximum [Member]
Jun. 30, 2012
Probability of Default [Member]
Weighted Average [Member]
Jun. 30, 2012
Prepayment Rates [Member]
Jun. 30, 2012
Prepayment Rates [Member]
Minimum [Member]
Jun. 30, 2012
Prepayment Rates [Member]
Maximum [Member]
Jun. 30, 2012
Prepayment Rates [Member]
Weighted Average [Member]
Jun. 30, 2012
Counterparty Credit Risk [Member]
Jun. 30, 2012
Counterparty Credit Risk [Member]
Minimum [Member]
Jun. 30, 2012
Counterparty Credit Risk [Member]
Maximum [Member]
Jun. 30, 2012
Discounted Cash Flow [Member]
Jun. 30, 2012
Par Value [Member]
Jun. 30, 2012
Option Model [Member]
Jun. 30, 2012
Internal Valuation [Member]
Jun. 30, 2012
Pooled Trust Preferred Collateralized Debt Obligations [Member]
Jun. 30, 2012
Pooled Trust Preferred Collateralized Debt Obligations [Member]
Discount Rates [Member]
Jun. 30, 2012
Pooled Trust Preferred Collateralized Debt Obligations [Member]
Discount Rates [Member]
Minimum [Member]
Jun. 30, 2012
Pooled Trust Preferred Collateralized Debt Obligations [Member]
Discount Rates [Member]
Maximum [Member]
Jun. 30, 2012
Other Investments [Member]
Jun. 30, 2012
Interest Rate Swap [Member]
Jun. 30, 2012
Impaired Loans [Member]
Jun. 30, 2012
Impaired Loans [Member]
Discount Rates [Member]
Jun. 30, 2012
Impaired Loans [Member]
Discount Rates [Member]
Minimum [Member]
Jun. 30, 2012
Impaired Loans [Member]
Discount Rates [Member]
Maximum [Member]
Jun. 30, 2012
Impaired Loans [Member]
Discounted Cash Flow [Member]
Jun. 30, 2012
Other Real Estate Owned [Member]
Quantitative inputs and assumptions used in Level 3 fair value measurements                                                          
Fair Value $ 1,212,738 $ 1,212,048                               $ 21,792       $ 1,420 $ 0 $ 20,745         $ 353
Valuation Techniques                           Discounted Cash Flow Par Value Option model Internal Valuation                     Discounted Cash Flow  
Unobservable Inputs     Probability of default       Prepayment rates       Counterparty credit risk               Discount rates           Discount rate        
Weighted average rate       0.00% 100.00% 22.29%   0.00% 100.00% 13.21%   66.49% 132.21%             7.00% 20.00%         8.42% 21.00%