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Mortgage Servicing - Summary of Estimated Change in the Value of MSRs Carried at Fair Value (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Transfers and Servicing [Abstract]  
Weighted average prepayment speeds, 10% $ (8,101)us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInPrepaymentSpeed
Weighted average prepayment speeds, 20% (15,760)us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf20PercentAdverseChangeInPrepaymentSpeed
Discount rate (Option-adjusted spread), 10% (3,553)us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf10PercentAdverseChangeInDiscountRate
Discount rate (Option-adjusted spread), 20% $ (6,860)us-gaap_SensitivityAnalysisOfFairValueOfInterestsContinuedToBeHeldByTransferorServicingAssetsOrLiabilitiesImpactOf20PercentAdverseChangeInDiscountRate