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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 | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Other real estate owned | $ 204 |  | $ 816
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%
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 | 15.00% |  | 26.00%
Interest-only classes of agency-guaranteed home equity conversion mortgage-backed securities, reported at fair value based on a fair value option election |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Interest-only classes of agency-guaranteed home equity conversion mortgage-backed securities | $ 17,078 | $ 17,200 |
Interest-only classes of agency-guaranteed home equity conversion mortgage-backed securities, reported at fair value based on a fair value option election | Discounted cash flow |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Weighted average range | 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% |  | 8.00%
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 | 83.00% |  | 90.00%
Fair Value Estimate |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Residential mortgage loan commitments | $ 150 |  | $ 69
Fair Value Estimate | Collateral appraisal |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Impaired loans | 11,207 |  | 10,260
Other real estate owned | 78 |  | 621
Fair Value Estimate | Business asset valuation |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Impaired loans | 1,547 |  | $ 616
Fair Value Estimate | Discounted cash flow |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Interest-only classes of agency-guaranteed home equity conversion mortgage-backed securities | $ 17,078 |  |
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%
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%
Minimum | Interest-only classes of agency-guaranteed home equity conversion mortgage-backed securities, reported at fair value based on a fair value option election | Discounted cash flow |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Weighted average range | 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% |  | 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 | 83.00% |  | 90.00%
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%
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 | 20.00% |  | 50.00%
Maximum | Interest-only classes of agency-guaranteed home equity conversion mortgage-backed securities, reported at fair value based on a fair value option election | Discounted cash flow |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Weighted average range | 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% |  | 8.00%
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 | 83.00% |  | 90.00%

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