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Fair Value of Financial Instruments Schedule of Significant Observable Inputs used in the Valuation Level 3 Assets(Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Asset Derivatives $ 37,661 $ 44,806
Loans Receivable, Fair Value Disclosure 371,934 394,395
Significant unobservable inputs Level 3    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Total 57,584 49,998
Significant unobservable inputs Level 3 | Tax exempt security | Discounted cash flow    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Trading assets [1] 0 $ 121
Significant unobservable inputs Level 3 | Tax exempt security | Discounted cash flow | Weighted Average    
Fair Value Assumptions and Methodology for Assets and Liabilities [Abstract]    
Short and long term cash flows   0.00%
Significant unobservable inputs Level 3 | Tax exempt security | Market Approach Valuation Technique    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Trading assets [1] 0 $ 8,193
Significant unobservable inputs Level 3 | Tax exempt security | Market Approach Valuation Technique | Weighted Average    
Fair Value Assumptions and Methodology for Assets and Liabilities [Abstract]    
Fair Value Assumptions, Yield To Maturity   6.50%
Significant unobservable inputs Level 3 | Interest Rate Lock Commitments | Internal Model [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Asset Derivatives [1] $ 5,560 $ 3,384
Significant unobservable inputs Level 3 | Interest Rate Lock Commitments | Internal Model [Member] | Minimum    
Fair Value Assumptions and Methodology for Assets and Liabilities [Abstract]    
Fair Value Assumptions, Pull Through Rate 45.00% 55.00%
Significant unobservable inputs Level 3 | Interest Rate Lock Commitments | Internal Model [Member] | Maximum    
Fair Value Assumptions and Methodology for Assets and Liabilities [Abstract]    
Fair Value Assumptions, Pull Through Rate 95.00% 95.00%
Significant unobservable inputs Level 3 | Forward Delivery Contracts | Internal Model [Member]    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Asset Derivatives [1] $ 0 $ 11
Significant unobservable inputs Level 3 | Forward Delivery Contracts | Internal Model [Member] | Minimum    
Fair Value Assumptions and Methodology for Assets and Liabilities [Abstract]    
Fair Value Assumptions, Pull Through Rate   80.00%
Significant unobservable inputs Level 3 | Forward Delivery Contracts | Internal Model [Member] | Maximum    
Fair Value Assumptions and Methodology for Assets and Liabilities [Abstract]    
Fair Value Assumptions, Pull Through Rate   100.00%
Nonperforming Financial Instruments | Significant unobservable inputs Level 3 | Investment in Loans    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Loans Receivable, Fair Value Disclosure [2] $ 52,024 $ 38,289
[1] Financial assets classified as Level 3 and fair valued using significant unobservable inputs classified as Level 3 have not been provided as these are not readily available to the Company (including servicing release premium for interest rate lock commitments and forward delivery contracts)
[2] Significant changes in any of these inputs in isolation could result in a significant change to the fair value measurement. A decline in the discount rate in isolation would increase the fair value. A decrease in the housing pricing index in isolation would decrease the fair value. Individual loan characteristics, such as location and value of underlying collateral, affect the loan resolution timeline. An increase in the loan resolution timeline in isolation would decrease the fair value. A decrease in the value of underlying properties in isolation would decrease the fair value.