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Disclosures About Fair Value of Financial Instruments - Narrative (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans held for sale, average life from purchase to sale	30 days
Significant Unobservable Inputs (Level 3) | Interest-only GNMA securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Settlements	$ (1,000)

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- Definition

Loans Held For Sale Average Life From Purchase To Sale

+ References

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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.

+ References

No definition available.

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- Definition

Amount of settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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