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Long-Term Debt - Summary of Long-term Debt (Parenthetical) (Detail)
Dec. 31, 2014
Medium-term Notes [Member]  
Debt Instrument [Line Items]  
Weighted-average interest rate 2.47%us-gaap_LongtermDebtWeightedAverageInterestRate
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_MediumTermNotesMember
Federal Home Loan Bank Advances [Member]  
Debt Instrument [Line Items]  
Weighted-average interest rate 0.31%us-gaap_LongtermDebtWeightedAverageInterestRate
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_FederalHomeLoanBankAdvancesMember
Bank Notes [Member]  
Debt Instrument [Line Items]  
Weighted-average interest rate 0.85%us-gaap_LongtermDebtWeightedAverageInterestRate
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_NotesPayableToBanksMember