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Disclosures About Fair Value of Financial Instruments - Summary of Financial Assets and Financial Liabilities Measured at Fair Value on Recurring and Nonrecurring Basis (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Other real estate owned | Collateral appraisal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Weighted average range		9.00%
Residential mortgage loan commitments | Adjusted market bid
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Residential mortgage loan commitments pull through rate	81.00%	78.00%
Fair Value Estimate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Other real estate owned		$ 35
Residential mortgage loan commitments	$ 196	$ 200
Minimum | Other real estate owned | Collateral appraisal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Weighted average range		8.00%
Minimum | Residential mortgage loan commitments | Adjusted market bid
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Residential mortgage loan commitments pull through rate	81.00%	78.00%
Maximum | Other real estate owned | Collateral appraisal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Weighted average range		9.00%
Maximum | Residential mortgage loan commitments | Adjusted market bid
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Residential mortgage loan commitments pull through rate	81.00%	78.00%
Real Estate | Collateral-dependent loans | Collateral appraisal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Weighted average range	12.00%	8.00%
Real Estate | Fair Value Estimate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral-dependent loans	$ 6,778	$ 2,928
Real Estate | Minimum | Collateral-dependent loans | Collateral appraisal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Weighted average range	8.00%	8.00%
Real Estate | Maximum | Collateral-dependent loans | Collateral appraisal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Weighted average range	20.00%	8.00%
Commercial and industrial | Collateral-dependent loans | Collateral appraisal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Weighted average range	8.00%	8.00%
Commercial and industrial | Collateral-dependent loans | Business asset valuation
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Weighted average range	40.00%	60.00%
Commercial and industrial | Fair Value Estimate
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Collateral-dependent loans	$ 553	$ 939
Commercial and industrial | Minimum | Collateral-dependent loans | Collateral appraisal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Weighted average range	7.00%	7.00%
Commercial and industrial | Minimum | Collateral-dependent loans | Business asset valuation
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Weighted average range	40.00%	60.00%
Commercial and industrial | Maximum | Collateral-dependent loans | Collateral appraisal
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Weighted average range	8.00%	8.00%
Commercial and industrial | Maximum | Collateral-dependent loans | Business asset valuation
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Weighted average range	40.00%	60.00%

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Collateral Dependent Loans, Fair Value Disclosure

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Fair value portion of arrangements with third parties, including, but not limited to, operating lease arrangement and arrangement in which the entity has agreed to expend funds to procure goods or services, or has agreed to commit resources to supply goods or services.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(25))
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Carrying amount as of the balance sheet date of other real estate and foreclosed assets. Other real estate may include real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations may also be included in real estate owned. Foreclosed assets include all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.10(4))
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