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Balance Sheet Offsetting - Schedule of Balance Sheet Offsetting (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Offsetting Assets Liabilities [Line Items]    
Financial assets, Net Amounts of Assets presented in the Condensed Consolidated Balance Sheets $ 3,211 $ 5,783
Financial liabilities, Gross Amounts Recognized in the Condensed Consolidated Balance Sheets 558,268 609,883
Financial liabilities, Gross Amounts Offset in the Condensed Consolidated Balance Sheets (1,284) (1,072)
Financial liabilities, Net Amounts of Assets presented in the Condensed Consolidated Balance Sheets 556,984 608,811
Financial liabilities, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Financial Instruments 1,284 1,072
Financial liabilities, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Collateral Pledged (586,519) (696,213)
Financial liabilities, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Net Amount (28,251) (86,330)
Repurchase Agreements [Member]    
Offsetting Assets Liabilities [Line Items]    
Financial liabilities, Gross Amounts Recognized in the Condensed Consolidated Balance Sheets 553,773 603,028
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 553,773 603,028
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 (573,759) (683,413)
Financial liabilities, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Net Amount (19,986) (80,385)
Interest Rate Swaps [Member]    
Offsetting Assets Liabilities [Line Items]    
Financial assets, Gross Amounts Recognized in the Condensed Consolidated Balance Sheets 3,211 5,783
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 3,211 5,783
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 3,211 5,783
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 3,211 5,783
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 3,211 5,783
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 3,211 5,783
Financial liabilities, Gross Amounts Recognized in the Condensed Consolidated Balance Sheets 4,495 6,855
Financial liabilities, Gross Amounts Offset in the Condensed Consolidated Balance Sheets (1,284) (1,072)
Financial liabilities, Net Amounts of Assets presented in the Condensed Consolidated Balance Sheets 3,211 5,783
Financial liabilities, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Financial Instruments 1,284 1,072
Financial liabilities, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Collateral Pledged (12,760) (12,800)
Financial liabilities, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Net Amount $ (8,265) $ (5,945)