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Fair Value (Qualitative information for assets and liabilities) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2014
Fair Value, Inputs, Level 3 [Member]
Dec. 31, 2013
Fair Value, Inputs, Level 3 [Member]
Jun. 30, 2014
Fair Value, Inputs, Level 3 [Member]
Derivative asset (S&P Purchased Options) [Member]
Option Pricing Model Technique [Member]
Jun. 30, 2014
Fair Value, Inputs, Level 3 [Member]
Derivative asset (S&P Purchased Options) [Member]
Option Pricing Model Technique [Member]
Minimum [Member]
Jun. 30, 2014
Fair Value, Inputs, Level 3 [Member]
Derivative asset (S&P Purchased Options) [Member]
Option Pricing Model Technique [Member]
Maximum [Member]
Jun. 30, 2014
Fair Value, Inputs, Level 3 [Member]
Servicing Assets [Member]
Cash Flow Valuation Technique [Member]
Jun. 30, 2014
Fair Value, Inputs, Level 3 [Member]
Servicing Assets [Member]
Cash Flow Valuation Technique [Member]
Minimum [Member]
Jun. 30, 2014
Fair Value, Inputs, Level 3 [Member]
Servicing Assets [Member]
Cash Flow Valuation Technique [Member]
Maximum [Member]
Jun. 30, 2014
Fair Value, Inputs, Level 3 [Member]
Derivative liability (S&P Embedded Options) [Member]
Option Pricing Model Technique [Member]
Jun. 30, 2014
Fair Value, Inputs, Level 3 [Member]
Derivative liability (S&P Embedded Options) [Member]
Option Pricing Model Technique [Member]
Minimum [Member]
Jun. 30, 2014
Fair Value, Inputs, Level 3 [Member]
Derivative liability (S&P Embedded Options) [Member]
Option Pricing Model Technique [Member]
Maximum [Member]
Jun. 30, 2014
Fair Value, Inputs, Level 3 [Member]
Collateral dependant impaired loan
Fair value of property or collateral [Member]
Jun. 30, 2014
Fair Value, Inputs, Level 3 [Member]
Collateral dependant impaired loan
Fair value of property or collateral [Member]
Minimum [Member]
Jun. 30, 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 $ 1,418,958 $ 1,588,425 $ 0 $ 19,680 $ 6,580     $ 13,655     $ (6,838)     $ 29,118    
Valuation Technique         Option pricing model     Cash flow valuation     Option pricing model     Fair value of property or collateral    
Unobservable Input         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    
Implied option volatility           23.23% 35.94%         23.23% 35.94%      
Counterparty credit risk (based on 5-year CDS spread)           57.00% 65.17%         57.00% 65.17%      
Constant prepayment rate                 5.60% 11.24%            
Discount rate                 10.00% 12.00%            
Appraised value                             22.20% 29.20%