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Securities Held-to-Maturity - Schedule of Securities Held-to-Maturity (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Schedule of Held-to-maturity Securities [Line Items]
Debt instruments: Pass-through GSEs (amortized cost)	$ 451	$ 16,863
Federal Agency [Member]
Schedule of Held-to-maturity Securities [Line Items]
Debt instruments: Pass-through GSEs (amortized cost)	$ 451	$ 16,863

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- Definition

Amount, before other-than-temporary impairment (OTTI) accretion, of investment in debt securities measured at amortized cost (held-to-maturity).

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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