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Fair Values of Assets and Liabilities - Valuation Assumption Ranges for MSRs (Detail) (Mortgage Servicing Rights [Member])
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Expected prepayment 13.20%us-gaap_FairValueInputsPrepaymentRate 12.10%us-gaap_FairValueInputsPrepaymentRate
Discount rate 10.10%us-gaap_FairValueInputsDiscountRate 10.10%us-gaap_FairValueInputsDiscountRate
Minimum [Member]
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Expected prepayment 12.00%us-gaap_FairValueInputsPrepaymentRate
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ServicingContractsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		  
Discount rate 9.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ServicingContractsMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember		  
Maximum [Member]
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Expected prepayment 22.00%us-gaap_FairValueInputsPrepaymentRate
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ServicingContractsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		  
Discount rate 13.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ServicingContractsMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember		  
Average [Member]
    
Fair Value Inputs, Assets, Quantitative Information [Line Items]    
Expected prepayment 13.00%us-gaap_FairValueInputsPrepaymentRate
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ServicingContractsMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember		  
Discount rate 10.00%us-gaap_FairValueInputsDiscountRate
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_ServicingContractsMember
/ us-gaap_RangeAxis
= us-gaap_WeightedAverageMember