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Disclosures about Fair Value of Financial Instruments - Summary of Financial Assets and Financial Liabilities Measured at Fair Value (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Fair Value Estimate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Residential mortgage loan commitments | $ 79 |
Fair Value Estimate | Collateral Appraisal |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Other real estate owned | 78 | $ 621
Fair Value Estimate | Discounted cash flow |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest-only GNMA securities | 16,272 |
Fair Value Estimate | Adjusted market bid |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Residential mortgage loan commitments |  | $ 69
Impaired loans | Collateral Appraisal |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement range |  | 8.00%
Impaired loans | Business Asset Valuation |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement range |  | 26.00%
Interest-only GNMA securities |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Interest-only GNMA securities | $ 16,272 |
Interest-only GNMA securities | Discounted cash flow |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement range | 12.00% |
Other real estate owned | Collateral Appraisal |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement range | 9.00% | 8.00%
Mortgages | Adjusted market bid |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Residential mortgage loan commitments pull through rate | 85.00% | 90.00%
Minimum | Impaired loans | Collateral Appraisal |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement range |  | 8.00%
Minimum | Impaired loans | Business Asset Valuation |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement range |  | 8.00%
Minimum | Interest-only GNMA securities | Discounted cash flow |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement range | 9.00% |
Minimum | Other real estate owned | Collateral Appraisal |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement range | 8.00% | 8.00%
Minimum | Mortgages | Adjusted market bid |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Residential mortgage loan commitments pull through rate | 85.00% | 90.00%
Maximum | Impaired loans | Collateral Appraisal |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement range |  | 8.00%
Maximum | Impaired loans | Business Asset Valuation |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement range |  | 50.00%
Maximum | Interest-only GNMA securities | Discounted cash flow |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement range | 14.00% |
Maximum | Other real estate owned | Collateral Appraisal |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement range | 9.00% | 8.00%
Maximum | Mortgages | Adjusted market bid |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Residential mortgage loan commitments pull through rate | 85.00% | 90.00%
Real estate | Fair Value Estimate | Collateral Appraisal |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Impaired loans | $ 12,767 | $ 10,260
Real estate | Impaired loans | Collateral Appraisal |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement range | 8.00% |
Real estate | Impaired loans | Business Asset Valuation |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement range | 37.00% |
Real estate | Minimum | Impaired loans | Collateral Appraisal |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement range | 8.00% |
Real estate | Minimum | Impaired loans | Business Asset Valuation |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement range | 34.00% |
Real estate | Maximum | Impaired loans | Collateral Appraisal |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement range | 10.00% |
Real estate | Maximum | Impaired loans | Business Asset Valuation |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement range | 45.00% |
Commercial and industrial | Fair Value Estimate | Business Asset Valuation |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Impaired loans | $ 1,505 | $ 616
Commercial and industrial | Impaired loans | Collateral Appraisal |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement range | 22.00% |
Commercial and industrial | Impaired loans | Business Asset Valuation |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement range | 8.00% |
Commercial and industrial | Minimum | Impaired loans | Collateral Appraisal |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement range | 8.00% |
Commercial and industrial | Minimum | Impaired loans | Business Asset Valuation |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement range | 8.00% |
Commercial and industrial | Maximum | Impaired loans | Collateral Appraisal |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement range | 50.00% |
Commercial and industrial | Maximum | Impaired loans | Business Asset Valuation |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Measurement range | 8.00% |

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