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Market value of securities pledged as collateral

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Face (par) amount of debt instrument at time of issuance.

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The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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Amount of Federal Home Loan Bank (FHLBank) advances to member financial institutions.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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The cash inflow from additional borrowings, net of cash paid to third parties in connection with debt origination.

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Weighted average interest rate of short-term debt outstanding.

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Short-Term Borrowings and Long-Term Debt - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Jan. 29, 2015
Debt Disclosure [Line Items]
Interest expense on debt	$ 8,000,000us-gaap_InterestExpenseDebt	$ 5,800,000us-gaap_InterestExpenseDebt
Weighted average interest rates associated with short-term borrowings	0.19%
Federal Home Loan Bank Advances	60,000,000us-gaap_FederalHomeLoanBankAdvances		0us-gaap_FederalHomeLoanBankAdvances
Proceeds from issuance of 3.50% Senior Notes	346,431,000	0
Senior Notes Three Point Five Zero Percent Due January Twenty Twenty Five [Member]
Debt Disclosure [Line Items]
Debt Instrument, Unamortized Discount	300,000
Debt Instrument, Face Amount	350,000,000			350,000,000
5.375% Senior Notes
Debt Disclosure [Line Items]
Debt Instrument, Face Amount	350,000,000
Proceeds from issuance of 3.50% Senior Notes	346,400,000
Federal Home Loan Bank Advances
Debt Disclosure [Line Items]
Market value of collateral pledged	1,300,000,000
Debt Instrument, Face Amount	60,000,000
Federal Reserve Bank Advances
Debt Disclosure [Line Items]
Market value of collateral pledged	$ 979,000,000