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Balance Sheet Offsetting - Schedule of Balance Sheet Offsetting (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Offsetting Assets Liabilities [Line Items]    
Financial assets, Net Amounts of Assets presented in the Consolidated Balance Sheets $ 9,344 $ 10,080
Financial liabilities, Gross Amounts Recognized in the Consolidated Balance Sheets 700,052 573,827
Financial liabilities, Gross Amounts offset in the Consolidated Balance Sheets (4) (120)
Financial liabilities, Net Amounts of Assets presented in the Consolidated Balance Sheets 700,048 573,707
Financial liabilities, Gross Amounts Not Offset in the Consolidated Balance Sheets, Financial Instruments 4 120
Financial liabilities, Gross Amounts Not Offset in the Consolidated Balance Sheets, Collateral Pledged (737,674) (641,312)
Financial liabilities, Gross Amounts Not Offset in the Consolidated Balance Sheets, Net Amount (37,622) (67,485)
Repurchase Agreements [Member]    
Offsetting Assets Liabilities [Line Items]    
Financial liabilities, Gross Amounts Recognized in the Consolidated Balance Sheets 690,704 563,627
Financial liabilities, Gross Amounts offset in the Consolidated Balance Sheets 0 0
Financial liabilities, Net Amounts of Assets presented in the Consolidated Balance Sheets 690,704 563,627
Financial liabilities, Gross Amounts Not Offset in the Consolidated Balance Sheets, Financial Instruments 0 0
Financial liabilities, Gross Amounts Not Offset in the Consolidated Balance Sheets, Collateral Pledged (721,102) (624,578)
Financial liabilities, Gross Amounts Not Offset in the Consolidated Balance Sheets, Net Amount (30,398) (60,951)
Interest Rate Swaps [Member]    
Offsetting Assets Liabilities [Line Items]    
Financial assets, Gross Amounts Recognized in the Consolidated Balance Sheets 9,344 10,080
Financial assets, Gross Amounts offset in the Consolidated Balance Sheets 0 0
Financial assets, Net Amounts of Assets presented in the Consolidated Balance Sheets 0 0
Financial assets, Gross Amounts Not Offset in the Consolidated Balance Sheets, Financial Instruments 9,344 10,080
Financial assets, Gross Amounts Not Offset in the Consolidated Balance Sheets, Collateral Pledged 0 0
Financial assets, Gross Amounts Not Offset in the Consolidated Balance Sheets, Net Amount 9,344 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 Consolidated Balance Sheets 9,344 10,080
Financial assets, Gross Amounts offset in the Consolidated Balance Sheets 0 0
Financial assets, Net Amounts of Assets presented in the Consolidated Balance Sheets 0 0
Financial assets, Gross Amounts Not Offset in the Consolidated Balance Sheets, Financial Instruments 9,344 10,080
Financial assets, Gross Amounts Not Offset in the Consolidated Balance Sheets, Collateral Pledged 0 0
Financial assets, Gross Amounts Not Offset in the Consolidated Balance Sheets, Net Amount 9,344 10,080
Financial liabilities, Gross Amounts Recognized in the Consolidated Balance Sheets 9,348 10,200
Financial liabilities, Gross Amounts offset in the Consolidated Balance Sheets (4) (120)
Financial liabilities, Net Amounts of Assets presented in the Consolidated Balance Sheets 9,344 10,080
Financial liabilities, Gross Amounts Not Offset in the Consolidated Balance Sheets, Financial Instruments 4 120
Financial liabilities, Gross Amounts Not Offset in the Consolidated Balance Sheets, Collateral Pledged (16,572) (16,734)
Financial liabilities, Gross Amounts Not Offset in the Consolidated Balance Sheets, Net Amount $ (7,224) $ (6,534)