Balance Sheet Offsetting - Schedule of Balance Sheet Offsetting (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Offsetting Assets Liabilities [Line Items]
Financial assets, Net Amounts Presented in the Consolidated Balance Sheets	$ 11,502	$ 1,938
Financial liabilities, Gross Amounts Recognized in the Consolidated Balance Sheets	440,278	446,458
Financial liabilities, Gross Amounts Offset in the Consolidated Balance Sheets	(117)	(2,265)
Financial liabilities, Net Amounts Presented in the Consolidated Balance Sheets	440,161	444,193
Financial liabilities, Gross Amounts Not Offset in the Consolidated Balance Sheets, Financial Instruments	117	2,265
Financial liabilities, Gross Amounts Not Offset in the Consolidated Balance Sheets, Collateral Pledged	(533,450)	(487,607)
Financial liabilities, Gross Amounts Not Offset in the Consolidated Balance Sheets, Net Amount	(93,172)	(41,149)
Repurchase Agreements [Member]
Offsetting Assets Liabilities [Line Items]
Financial liabilities, Gross Amounts Recognized in the Consolidated Balance Sheets	428,659	442,255
Financial liabilities, Gross Amounts Offset in the Consolidated Balance Sheets	0	0
Financial liabilities, Net Amounts Presented in the Consolidated Balance Sheets	428,659	442,255
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	(510,138)	(487,607)
Financial liabilities, Gross Amounts Not Offset in the Consolidated Balance Sheets, Net Amount	(81,479)	(45,352)
Interest Rate Swaps [Member]
Offsetting Assets Liabilities [Line Items]
Financial assets, Gross Amounts Recognized in the Consolidated Balance Sheets	11,502	1,938
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	11,502	1,938
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	11,502	1,938
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	11,502	1,938
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	11,502	1,938
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	11,502	1,938
Financial liabilities, Gross Amounts Recognized in the Consolidated Balance Sheets	11,619	4,203
Financial liabilities, Gross Amounts Offset in the Consolidated Balance Sheets	(117)	(2,265)
Financial liabilities, Net Amounts Presented in the Consolidated Balance Sheets	11,502	1,938
Financial liabilities, Gross Amounts Not Offset in the Consolidated Balance Sheets, Financial Instruments	117	2,265
Financial liabilities, Gross Amounts Not Offset in the Consolidated Balance Sheets, Collateral Pledged	(23,312)	0
Financial liabilities, Gross Amounts Not Offset in the Consolidated Balance Sheets, Net Amount	$ (11,693)	$ 4,203

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