Balance Sheet Offsetting - Schedule of Balance Sheet Offsetting (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Offsetting Assets Liabilities [Line Items]
Financial liabilities, Gross Amounts Recognized in the Condensed Consolidated Balance Sheets	$ 571,976	$ 573,827
Financial liabilities, Gross Amounts offset in the Condensed Consolidated Balance Sheets	0	(120)
Financial liabilities, Net Amounts of Assets presented in the Condensed Consolidated Balance Sheets	571,976us-gaap_DerivativeLiabilities	573,707us-gaap_DerivativeLiabilities
Financial liabilities, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Financial Instruments	0	120
Financial liabilities, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Collateral Pledged	(703,778)	(641,312)
Financial liabilities, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Net Amount	(131,802)	(67,485)
Repurchase agreements [Member]
Offsetting Assets Liabilities [Line Items]
Financial liabilities, Gross Amounts Recognized in the Condensed Consolidated Balance Sheets	560,352	563,627
Financial liabilities, Gross Amounts offset in the Condensed Consolidated Balance Sheets	0	0
Financial liabilities, Net Amounts of Assets presented in the Condensed Consolidated Balance Sheets	560,352	563,627
Financial liabilities, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Financial Instruments	0	0
Financial liabilities, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Collateral Pledged	(687,017)	(624,578)
Financial liabilities, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Net Amount	(126,665)	(60,951)
Interest rate swaps [Member]
Offsetting Assets Liabilities [Line Items]
Financial assets, Gross Amounts Recognized in the Condensed Consolidated Balance Sheets	11,624	10,080
Financial assets, Gross Amounts offset in the Condensed Consolidated Balance Sheets	0	0
Financial assets, Net Amounts of Assets presented in the Condensed Consolidated Balance Sheets	0	0
Financial assets, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Financial Instruments	11,624	10,080
Financial assets, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Collateral Pledged	0	0
Financial assets, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Net Amount	11,624	10,080
Interest rate swaps [Member] \| Derivatives not designated as hedging instruments [Member]
Offsetting Assets Liabilities [Line Items]
Financial assets, Gross Amounts Recognized in the Condensed Consolidated Balance Sheets	11,624	10,080
Financial assets, Gross Amounts offset in the Condensed Consolidated Balance Sheets	0	0
Financial assets, Net Amounts of Assets presented in the Condensed Consolidated Balance Sheets	0	0
Financial assets, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Financial Instruments	11,624	10,080
Financial assets, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Collateral Pledged	0	0
Financial assets, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Net Amount	11,624	10,080
Financial liabilities, Gross Amounts Recognized in the Condensed Consolidated Balance Sheets	11,624	10,200
Financial liabilities, Gross Amounts offset in the Condensed Consolidated Balance Sheets	0	(120)
Financial liabilities, Net Amounts of Assets presented in the Condensed Consolidated Balance Sheets	11,624	10,080
Financial liabilities, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Financial Instruments	0	120
Financial liabilities, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Collateral Pledged	(16,761)	(16,734)
Financial liabilities, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Net Amount	$ (5,137)	$ (6,534)

Gross collateral received 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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Amount of obligation to return cash collateral under master netting arrangements offset against derivative assets.

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