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Information about Significant Unobservable Inputs Used for Recurring Fair Value Measurements for Level 3 MSRs (Detail) - Fair Value, Measurements, Recurring - Level 3 - Mortgage Servicing Rights
9 Months Ended
Sep. 30, 2016
USD ($)
[1]
Minimum  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Unobservable Input, discount rate 10.00%
Unobservable Input, Prepayment rate 6.30%
Unobservable Input, Delinquency rate 0.00%
Unobservable Input, Cost to service $ 84
Maximum  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Unobservable Input, discount rate 15.00%
Unobservable Input, Prepayment rate 43.20%
Unobservable Input, Delinquency rate 8.00%
Unobservable Input, Cost to service $ 146
Weighted Average  
Fair Value Inputs, Assets, Quantitative Information [Line Items]  
Unobservable Input, discount rate 10.40%
Unobservable Input, Prepayment rate 20.10%
Unobservable Input, Delinquency rate 2.00%
Unobservable Input, Cost to service $ 100
[1] Represents rates, estimates and assumptions that the Company believes would be used by market participants when valuing these assets.