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Balance Sheet Offsetting - Schedule of Balance Sheet Offsetting (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Offsetting Assets Liabilities [Line Items]    
Financial liabilities, Gross Amounts Recognized in the Condensed Consolidated Balance Sheets $ 621,868 $ 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 621,868 573,707
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 (690,434) (641,312)
Financial liabilities, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Net Amount (68,566) (67,485)
Repurchase Agreements [Member]    
Offsetting Assets Liabilities [Line Items]    
Financial liabilities, Gross Amounts Recognized in the Condensed Consolidated Balance Sheets 610,174 563,627
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 610,174 563,627
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 (673,853) (624,578)
Financial liabilities, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Net Amount (63,679) (60,951)
Interest Rate Swaps [Member]    
Offsetting Assets Liabilities [Line Items]    
Financial assets, Gross Amounts Recognized in the Condensed Consolidated Balance Sheets 11,694 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 11,694 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 11,694 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 11,694 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 11,694 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 11,694 10,080
Financial liabilities, Gross Amounts Recognized in the Condensed Consolidated Balance Sheets 11,694 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 11,694 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 (16,581) (16,734)
Financial liabilities, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Net Amount $ (4,887) $ (6,534)