Balance Sheet Offsetting - Schedule of Balance Sheet Offsetting (Detail) (Interest rate swaps [Member], USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Offsetting Assets Liabilities [Line Items]
Financial assets, Gross Amounts Recognized in the Condensed Consolidated Balance Sheets	$ 12,830	$ 23,966
Financial assets, Gross Amounts offset in the Condensed Consolidated Balance Sheets
Financial assets, Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets
Financial assets, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Financial Instruments	12,830	23,966
Financial assets, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Collateral Pledged
Financial assets, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Net Amount	12,830	23,966
Financial liabilities, Gross Amounts Recognized in the Condensed Consolidated Balance Sheets	505,505	497,210
Financial liabilities, Gross Amounts offset in the Condensed Consolidated Balance Sheets	(1,034)
Financial liabilities, Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets	504,471	497,210
Financial liabilities, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Financial Instruments
Financial liabilities, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Collateral Pledged	(561,540)	(505,000)
Financial liabilities, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Net Amount	(57,069)	(34,379)
Derivatives not designated as hedging instruments [Member]
Offsetting Assets Liabilities [Line Items]
Financial assets, Gross Amounts Recognized in the Condensed Consolidated Balance Sheets	12,830	23,966
Financial assets, Gross Amounts offset in the Condensed Consolidated Balance Sheets
Financial assets, Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets
Financial assets, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Financial Instruments	12,830	23,966
Financial assets, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Collateral Pledged
Financial assets, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Net Amount	12,830	23,966
Financial liabilities, Gross Amounts Recognized in the Condensed Consolidated Balance Sheets	13,864	23,966
Financial liabilities, Gross Amounts offset in the Condensed Consolidated Balance Sheets	(1,034)
Financial liabilities, Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets	12,830	23,966
Financial liabilities, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Financial Instruments
Financial liabilities, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Collateral Pledged	(26,588)	(26,598)
Financial liabilities, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Net Amount	(13,758)	(2,623)
Repurchase agreements [Member]
Offsetting Assets Liabilities [Line Items]
Financial liabilities, Gross Amounts Recognized in the Condensed Consolidated Balance Sheets	491,641	473,244
Financial liabilities, Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets	491,641	473,244
Financial liabilities, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Financial Instruments
Financial liabilities, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Collateral Pledged	(534,952)	(505,000)
Financial liabilities, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Net Amount	$ (43,311)	$ (31,756)

Gross collateral received amount not offset in consolidated balance sheets.

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Gross financial instruments assets amount not offset in consolidated balance sheets

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Gross financial instruments liabilities amount not offset in consolidated balance sheets

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Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Amount of right to receive cash collateral under master netting arrangements that have not been offset against derivative liabilities.

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Fair value of financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be offset against an obligation to return collateral under a master netting arrangement.

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Fair value of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be offset against a right to receive collateral under a master netting arrangement.

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Fair value of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset offset against the right to receive collateral. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Fair value of asset associated with financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

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