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Fair Value - Schedule of Significant Unobservable Inputs Used in Fair Value Measurement of Assets and Liabilities on Recurring Basis (Detail) - Recurring Measurement Basis - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Freestanding Derivative Instruments | Interest Rate Lock Commitments | Minimum    
Significant Unobservable Inputs Used In Fair Value Measurement [Line Items]    
Loan funding probability 18.75% 34.40%
Fair value of initial servicing rights multiple 0.02 0.04
Freestanding Derivative Instruments | Interest Rate Lock Commitments | Maximum    
Significant Unobservable Inputs Used In Fair Value Measurement [Line Items]    
Loan funding probability 100.00% 100.00%
Fair value of initial servicing rights multiple 5.16 6.04
Freestanding Derivative Instruments | Interest Rate Lock Commitments | Weighted Average    
Significant Unobservable Inputs Used In Fair Value Measurement [Line Items]    
Loan funding probability 81.13% 83.36%
Fair value of initial servicing rights multiple 3.52 3.69
Mortgage-Backed Debt Related to Non-Residual Trusts | Minimum    
Significant Unobservable Inputs Used In Fair Value Measurement [Line Items]    
Discount rate 6.00% 6.00%
Conditional prepayment rate 2.27% 2.22%
Conditional default rate 2.56% 2.32%
Loss severity 83.45% 77.88%
Mortgage-Backed Debt Related to Non-Residual Trusts | Maximum    
Significant Unobservable Inputs Used In Fair Value Measurement [Line Items]    
Discount rate 6.00% 6.00%
Conditional prepayment rate 3.07% 3.17%
Conditional default rate 5.84% 4.66%
Loss severity 100.00% 100.00%
Mortgage-Backed Debt Related to Non-Residual Trusts | Weighted Average    
Significant Unobservable Inputs Used In Fair Value Measurement [Line Items]    
Discount rate 6.00% 6.00%
Conditional prepayment rate 2.73% 2.65%
Conditional default rate 3.63% 3.34%
Loss severity 95.97% 94.51%
HMBS Related Obligations | Minimum    
Significant Unobservable Inputs Used In Fair Value Measurement [Line Items]    
Weighted-average remaining life in years 5 months 4 months 24 days
Conditional repayment rate 11.77% 11.49%
Discount rate 1.59% 1.50%
HMBS Related Obligations | Maximum    
Significant Unobservable Inputs Used In Fair Value Measurement [Line Items]    
Weighted-average remaining life in years 7 years 2 months 7 years 2 months 12 days
Conditional repayment rate 64.92% 57.76%
Discount rate 3.19% 3.17%
HMBS Related Obligations | Weighted Average    
Significant Unobservable Inputs Used In Fair Value Measurement [Line Items]    
Weighted-average remaining life in years 3 years 1 month 3 years 2 months
Conditional repayment rate 28.84% 27.74%
Discount rate 2.63% 2.56%
Reverse Loans | Minimum    
Significant Unobservable Inputs Used In Fair Value Measurement [Line Items]    
Weighted-average remaining life in years 6 months 7 months 6 days
Conditional repayment rate 12.17% 13.23%
Discount rate 2.04% 1.93%
Reverse Loans | Maximum    
Significant Unobservable Inputs Used In Fair Value Measurement [Line Items]    
Weighted-average remaining life in years 9 years 9 months 10 years 2 months 12 days
Conditional repayment rate 59.43% 55.32%
Discount rate 3.72% 3.69%
Reverse Loans | Weighted Average    
Significant Unobservable Inputs Used In Fair Value Measurement [Line Items]    
Weighted-average remaining life in years 3 years 8 months 3 years 9 months 18 days
Conditional repayment rate 29.58% 28.48%
Discount rate 3.00% 2.93%
Mortgage Loans Related to Non-Residual Trusts | Minimum    
Significant Unobservable Inputs Used In Fair Value Measurement [Line Items]    
Discount rate 8.00% 8.00%
Conditional prepayment rate 1.91% 1.98%
Conditional default rate 0.99% 1.02%
Loss severity 85.33% 79.98%
Mortgage Loans Related to Non-Residual Trusts | Maximum    
Significant Unobservable Inputs Used In Fair Value Measurement [Line Items]    
Discount rate 8.00% 8.00%
Conditional prepayment rate 2.44% 2.67%
Conditional default rate 5.10% 4.25%
Loss severity 100.00% 100.00%
Mortgage Loans Related to Non-Residual Trusts | Weighted Average    
Significant Unobservable Inputs Used In Fair Value Measurement [Line Items]    
Discount rate 8.00% 8.00%
Conditional prepayment rate 2.19% 2.27%
Conditional default rate 2.50% 2.61%
Loss severity 97.73% 96.61%
Charged-Off Loans | Minimum    
Significant Unobservable Inputs Used In Fair Value Measurement [Line Items]    
Discount rate 28.00% 28.00%
Collection rate 3.20% 2.69%
Charged-Off Loans | Maximum    
Significant Unobservable Inputs Used In Fair Value Measurement [Line Items]    
Discount rate 28.00% 28.00%
Collection rate 5.37% 3.55%
Charged-Off Loans | Weighted Average    
Significant Unobservable Inputs Used In Fair Value Measurement [Line Items]    
Discount rate 28.00% 28.00%
Collection rate 3.31% 2.74%
Receivables Related to Non-Residual Trusts | Minimum    
Significant Unobservable Inputs Used In Fair Value Measurement [Line Items]    
Discount rate 0.50% 0.50%
Conditional prepayment rate 2.27% 2.22%
Conditional default rate 2.56% 2.32%
Loss severity 83.45% 77.88%
Receivables Related to Non-Residual Trusts | Maximum    
Significant Unobservable Inputs Used In Fair Value Measurement [Line Items]    
Discount rate 0.50% 0.50%
Conditional prepayment rate 3.07% 3.17%
Conditional default rate 5.84% 4.66%
Loss severity 100.00% 100.00%
Receivables Related to Non-Residual Trusts | Weighted Average    
Significant Unobservable Inputs Used In Fair Value Measurement [Line Items]    
Discount rate 0.50% 0.50%
Conditional prepayment rate 2.73% 2.65%
Conditional default rate 3.63% 3.34%
Loss severity 95.97% 94.51%
Servicing Rights Carried at Fair Value | Minimum    
Significant Unobservable Inputs Used In Fair Value Measurement [Line Items]    
Weighted-average remaining life in years 2 years 6 months 2 years 7 months 6 days
Discount rate 10.71% 10.68%
Conditional prepayment rate 5.89% 5.76%
Conditional default rate 0.04% 0.04%
Cost to service $ 62 $ 62
Servicing Rights Carried at Fair Value | Maximum    
Significant Unobservable Inputs Used In Fair Value Measurement [Line Items]    
Weighted-average remaining life in years 7 years 6 months 7 years 4 months 24 days
Discount rate 15.27% 14.61%
Conditional prepayment rate 23.00% 21.67%
Conditional default rate 3.02% 2.97%
Cost to service $ 1,181 $ 1,260
Servicing Rights Carried at Fair Value | Weighted Average    
Significant Unobservable Inputs Used In Fair Value Measurement [Line Items]    
Weighted-average remaining life in years 6 years 6 years
Discount rate 11.83% 11.56%
Conditional prepayment rate 9.24% 9.09%
Conditional default rate 0.90% 0.88%
Cost to service $ 130 $ 128
Freestanding Derivative Instruments | Interest Rate Lock Commitments | Minimum    
Significant Unobservable Inputs Used In Fair Value Measurement [Line Items]    
Loan funding probability 2.28% 16.00%
Fair value of initial servicing rights multiple 0.01 0.01
Freestanding Derivative Instruments | Interest Rate Lock Commitments | Maximum    
Significant Unobservable Inputs Used In Fair Value Measurement [Line Items]    
Loan funding probability 100.00% 100.00%
Fair value of initial servicing rights multiple 5.82 5.98
Freestanding Derivative Instruments | Interest Rate Lock Commitments | Weighted Average    
Significant Unobservable Inputs Used In Fair Value Measurement [Line Items]    
Loan funding probability 71.91% 75.86%
Fair value of initial servicing rights multiple 3.01 3.06