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Fair Value (Qualitative information for assets and liabilities) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2014
Fair Value, Inputs, Level 3 [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 3 [Member]
Mar. 31, 2014
Fair Value, Inputs, Level 3 [Member]
Other Debt Obligations [Member]
Mar. 31, 2014
Fair Value, Inputs, Level 3 [Member]
Other Debt Obligations [Member]
Market Approach Valuation Technique [Member]
Mar. 31, 2014
Fair Value, Inputs, Level 3 [Member]
Other Debt Obligations [Member]
Market Approach Valuation Technique [Member]
Minimum [Member]
Mar. 31, 2014
Fair Value, Inputs, Level 3 [Member]
Other Debt Obligations [Member]
Market Approach Valuation Technique [Member]
Maximum [Member]
Mar. 31, 2014
Fair Value, Inputs, Level 3 [Member]
Derivative asset (S&P Purchased Options) [Member]
Option Pricing Model Technique [Member]
Mar. 31, 2014
Fair Value, Inputs, Level 3 [Member]
Derivative asset (S&P Purchased Options) [Member]
Option Pricing Model Technique [Member]
Minimum [Member]
Mar. 31, 2014
Fair Value, Inputs, Level 3 [Member]
Derivative asset (S&P Purchased Options) [Member]
Option Pricing Model Technique [Member]
Maximum [Member]
Mar. 31, 2014
Fair Value, Inputs, Level 3 [Member]
Servicing Assets [Member]
Cash Flow Valuation Technique [Member]
Mar. 31, 2014
Fair Value, Inputs, Level 3 [Member]
Servicing Assets [Member]
Cash Flow Valuation Technique [Member]
Minimum [Member]
Mar. 31, 2014
Fair Value, Inputs, Level 3 [Member]
Servicing Assets [Member]
Cash Flow Valuation Technique [Member]
Maximum [Member]
Mar. 31, 2014
Fair Value, Inputs, Level 3 [Member]
Derivative liability (S&P Embedded Options) [Member]
Option Pricing Model Technique [Member]
Mar. 31, 2014
Fair Value, Inputs, Level 3 [Member]
Derivative liability (S&P Embedded Options) [Member]
Option Pricing Model Technique [Member]
Minimum [Member]
Mar. 31, 2014
Fair Value, Inputs, Level 3 [Member]
Derivative liability (S&P Embedded Options) [Member]
Option Pricing Model Technique [Member]
Maximum [Member]
Mar. 31, 2014
Fair Value, Inputs, Level 3 [Member]
Collateral dependant impaired loan
Fair value of property or collateral [Member]
Mar. 31, 2014
Fair Value, Inputs, Level 3 [Member]
Collateral dependant impaired loan
Fair value of property or collateral [Member]
Minimum [Member]
Mar. 31, 2014
Fair Value, Inputs, Level 3 [Member]
Collateral dependant impaired loan
Fair value of property or collateral [Member]
Maximum [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]                                        
Fair Value assets and liabilities measured on reccurring basis $ 1,455,685 $ 1,588,425 $ 20,053 $ 19,680 $ 20,053 $ 20,053     $ 12,555     $ 13,970     $ (12,120)     $ 27,975    
Valuation Technique           Market comparable bonds     Option pricing model     Cash flow valuation     Option pricing model     Fair value of property or collateral    
Unobservable Input           Indicative pricing Option adjusted spread Yield to maturity Spread to maturity     Implied option volatility Counterparty credit risk (based on 5-year credit default swap ("CDS") spread)     Constant prepayment rate Discount rate     Implied option volatility Counterparty credit risk (based on 5-year CDS spread)     Appraised value less disposition costs    
Indicative Pricing             97.125% 98.97%                        
OAS spread             683.70% 1602.00%                        
Yield to maturity             7.05% 15.89%                        
Spread to maturity             689.90% 1579.00%                        
Implied option volatility                   22.887% 53.615%         22.887% 53.615%      
Counterparty credit risk (based on 5-year CDS spread)                   56.36% 86.49%         56.36% 86.49%      
Constant prepayment rate                         5.60% 10.08%            
Discount rate                         10.00% 12.00%            
Appraised value                                     21.30% 28.30%