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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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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.

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Amount of investments classified as other.

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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.

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