Balance Sheet Offsetting - Schedule of Balance Sheet Offsetting (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Offsetting Assets Liabilities [Line Items]
Financial liabilities, Gross Amounts Recognized in the Condensed Consolidated Balance Sheets	$ 520,675	$ 440,278
Financial liabilities, Gross Amounts Offset in the Condensed Consolidated Balance Sheets		(117)
Financial liabilities, Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets	520,675	440,161
Financial liabilities, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Financial Instruments		117
Financial liabilities, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Collateral Pledged	(565,481)	(533,450)
Financial liabilities, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Net Amount	(44,806)	(93,172)
Repurchase Agreements [Member]
Offsetting Assets Liabilities [Line Items]
Financial liabilities, Gross Amounts Recognized in the Condensed Consolidated Balance Sheets	483,420	428,659
Financial liabilities, Gross Amounts Offset in the Condensed Consolidated Balance Sheets
Financial liabilities, Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets	483,420	428,659
Financial liabilities, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Financial Instruments
Financial liabilities, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Collateral Pledged	(498,535)	(510,138)
Financial liabilities, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Net Amount	(15,115)	(81,479)
Interest Rate Swaps [Member]
Offsetting Assets Liabilities [Line Items]
Financial assets, Gross Amounts Recognized in the Condensed Consolidated Balance Sheets	37,255	11,502
Financial assets, Gross Amounts Offset in the Condensed Consolidated Balance Sheets
Financial assets, Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets
Financial assets, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Financial Instruments	37,255	11,502
Financial assets, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Collateral Pledged
Financial assets, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Net Amount	37,255	11,502
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	37,255	11,502
Financial assets, Gross Amounts Offset in the Condensed Consolidated Balance Sheets
Financial assets, Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets
Financial assets, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Financial Instruments	37,255	11,502
Financial assets, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Collateral Pledged
Financial assets, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Net Amount	37,255	11,502
Financial liabilities, Gross Amounts Recognized in the Condensed Consolidated Balance Sheets	37,255	11,619
Financial liabilities, Gross Amounts Offset in the Condensed Consolidated Balance Sheets		(117)
Financial liabilities, Net Amounts of Assets Presented in the Condensed Consolidated Balance Sheets	37,255	11,502
Financial liabilities, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Financial Instruments		117
Financial liabilities, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Collateral Pledged	(66,946)	(23,312)
Financial liabilities, Gross Amounts Not Offset in the Condensed Consolidated Balance Sheets, Net Amount	$ (29,691)	$ (11,693)

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