Balance Sheet Offsetting - Schedule of Balance Sheet Offsetting (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Offsetting Assets Liabilities [Line Items]
Financial assets, Net Amounts of Assets presented in the Condensed Consolidated Balance Sheets	$ 1,938	$ 3,211
Financial liabilities, Gross Amounts Recognized in the Consolidated Balance Sheets	446,458	558,268
Financial liabilities, Gross Amounts Offset in the Consolidated Balance Sheets	(2,265)	(1,284)
Financial liabilities, Net Amounts of Assets presented in the Consolidated	444,193	556,984
Financial liabilities, Gross Amounts Not Offset in the Consolidated Balance Sheets, Financial Instruments	2,265	1,284
Financial liabilities, Gross Amounts Not Offset in the Consolidated Balance Sheets, Collateral Pledged	(487,607)	(586,519)
Financial liabilities, Gross Amounts Not Offset in the Consolidated Balance Sheets, Net Amount	(41,149)	(28,251)
Repurchase Agreements [Member]
Offsetting Assets Liabilities [Line Items]
Financial liabilities, Gross Amounts Recognized in the Consolidated Balance Sheets	442,255	553,773
Financial liabilities, Gross Amounts Offset in the Consolidated Balance Sheets	0	0
Financial liabilities, Net Amounts of Assets presented in the Consolidated	442,255	553,773
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	(487,607)	(573,759)
Financial liabilities, Gross Amounts Not Offset in the Consolidated Balance Sheets, Net Amount	(45,352)	(19,986)
Interest Rate Swaps [Member]
Offsetting Assets Liabilities [Line Items]
Financial assets, Gross Amounts Recognized in the Consolidated Balance Sheets	1,938	3,211
Financial assets, Gross Amounts Offset in the 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 Consolidated Balance Sheets, Financial Instruments	1,938	3,211
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	1,938	3,211
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	1,938	3,211
Financial assets, Gross Amounts Offset in the 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 Consolidated Balance Sheets, Financial Instruments	1,938	3,211
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	1,938	3,211
Financial liabilities, Gross Amounts Recognized in the Consolidated Balance Sheets	4,203	4,495
Financial liabilities, Gross Amounts Offset in the Consolidated Balance Sheets	(2,265)	(1,284)
Financial liabilities, Net Amounts of Assets presented in the Consolidated	1,938	3,211
Financial liabilities, Gross Amounts Not Offset in the Consolidated Balance Sheets, Financial Instruments	2,265	1,284
Financial liabilities, Gross Amounts Not Offset in the Consolidated Balance Sheets, Collateral Pledged	0	(12,760)
Financial liabilities, Gross Amounts Not Offset in the Consolidated Balance Sheets, Net Amount	$ 4,203	$ (8,265)

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