Balance Sheet Offsetting - Schedule of Balance Sheet Offsetting (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Offsetting Assets Liabilities [Line Items]
Financial assets, Net Amounts Presented in the Consolidated Balance Sheets	$ 30,181	$ 11,502
Financial liabilities, Gross Amounts Recognized in the Consolidated Balance Sheets	469,840	440,278
Financial liabilities, Gross Amounts Offset in the Consolidated Balance Sheets	(253)	(117)
Financial liabilities, Net Amounts Presented in the Consolidated Balance Sheets	469,587	440,161
Financial liabilities, Gross Amounts Not Offset in the Consolidated Balance Sheets, Financial Instruments	253	117
Financial liabilities, Gross Amounts Not Offset in the Consolidated Balance Sheets, Collateral Pledged	(547,333)	(533,450)
Financial liabilities, Gross Amounts Not Offset in the Consolidated Balance Sheets, Net Amount	(77,493)	(93,172)
Repurchase Agreements [Member]
Offsetting Assets Liabilities [Line Items]
Financial liabilities, Gross Amounts Recognized in the Consolidated Balance Sheets	439,406	428,659
Financial liabilities, Gross Amounts Offset in the Consolidated Balance Sheets	0	0
Financial liabilities, Net Amounts Presented in the Consolidated Balance Sheets	439,406	428,659
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	(483,603)	(510,138)
Financial liabilities, Gross Amounts Not Offset in the Consolidated Balance Sheets, Net Amount	(44,197)	(81,479)
Interest Rate Swaps [Member]
Offsetting Assets Liabilities [Line Items]
Financial assets, Gross Amounts Recognized in the Consolidated Balance Sheets	30,181	11,502
Financial assets, Gross Amounts Offset in the Consolidated Balance Sheets	0	0
Financial assets, Net Amounts Presented in the Consolidated Balance Sheets	0	0
Financial assets, Gross Amounts Not Offset in the Consolidated Balance Sheets, Financial Instruments	30,181	11,502
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	30,181	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 Consolidated Balance Sheets	30,181	11,502
Financial assets, Gross Amounts Offset in the Consolidated Balance Sheets	0	0
Financial assets, Net Amounts Presented in the Consolidated Balance Sheets	0	0
Financial assets, Gross Amounts Not Offset in the Consolidated Balance Sheets, Financial Instruments	30,181	11,502
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	30,181	11,502
Financial liabilities, Gross Amounts Recognized in the Consolidated Balance Sheets	30,434	11,619
Financial liabilities, Gross Amounts Offset in the Consolidated Balance Sheets	(253)	(117)
Financial liabilities, Net Amounts Presented in the Consolidated Balance Sheets	30,181	11,502
Financial liabilities, Gross Amounts Not Offset in the Consolidated Balance Sheets, Financial Instruments	253	117
Financial liabilities, Gross Amounts Not Offset in the Consolidated Balance Sheets, Collateral Pledged	(63,730)	(23,312)
Financial liabilities, Gross Amounts Not Offset in the Consolidated Balance Sheets, Net Amount	$ (33,296)	$ (11,693)

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