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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, 2020 | Dec. 31, 2019
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other real estate owned | $ 131 | $ 173
Interest-only GNMA securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest-only GNMA securities | $ 15,276 | $ 16,272
Interest-only GNMA securities | Discounted cash flow |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Weighted average range | 12.00% | 12.00%
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 | 80.00% | 85.00%
Fair Value Estimate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest-only GNMA securities | $ 15,276 | $ 16,272
Other real estate owned |  | 78
Residential mortgage loan commitments | $ 215 | $ 79
Minimum | Interest-only GNMA securities | Discounted cash flow |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Weighted average range | 5.00% | 9.00%
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 | 80.00% | 85.00%
Maximum | Interest-only GNMA securities | Discounted cash flow |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Weighted average range | 13.00% | 14.00%
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 | 80.00% | 85.00%
Real Estate | Impaired loans, net of specific reserves | Collateral appraisal |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Weighted average range | 8.00% | 8.00%
Real Estate | Impaired loans, net of specific reserves | Business asset valuation |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Weighted average range | 20.00% | 37.00%
Real Estate | Fair Value Estimate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Impaired loans | $ 27,735 | $ 12,767
Real Estate | Minimum | Impaired loans, net of specific reserves | Collateral appraisal |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Weighted average range | 8.00% | 8.00%
Real Estate | Minimum | Impaired loans, net of specific reserves | Business asset valuation |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Weighted average range | 11.00% | 34.00%
Real Estate | Maximum | Impaired loans, net of specific reserves | Collateral appraisal |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Weighted average range | 10.00% | 10.00%
Real Estate | Maximum | Impaired loans, net of specific reserves | Business asset valuation |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Weighted average range | 45.00% | 45.00%
Commercial and industrial | Impaired loans, net of specific reserves | 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 | Impaired loans, net of specific reserves | Business asset valuation |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Weighted average range | 8.00% | 22.00%
Commercial and industrial | Fair Value Estimate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Impaired loans | $ 1,188 | $ 1,505
Commercial and industrial | Minimum | Impaired loans, net of specific reserves | 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 | Minimum | Impaired loans, net of specific reserves | Business asset valuation |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Weighted average range | 8.00% | 8.00%
Commercial and industrial | Maximum | Impaired loans, net of specific reserves | 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 | Impaired loans, net of specific reserves | Business asset valuation |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Weighted average range | 8.00% | 50.00%

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