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Income Tax - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Taxes [Line Items]
U.S. federal corporate tax rate		21.00%	35.00%	35.00%
Previously acquired institutions amount of allocated income to bad debt deductions		$ 12,800,000
Unrecorded deferred income tax liability		$ 2,700,000
Bad debt reserve, description		Retained earnings of the Bank include approximately $12.8 million for which no deferred income tax liability has been recognized. This amount represents an allocation of previously acquired institutions income to bad debt deductions as of December 31, 1987 for tax purposes only. Reductions of amounts so allocated for purposes other than tax bad debt losses including redemption of bank stock or excess dividends, or loss of “bank” status would create income for tax purposes only, which would be subject to the then-current corporate income tax rate.
Scenario, Forecast [Member]
Income Taxes [Line Items]
U.S. federal corporate tax rate	21.00%
State Tax Jurisdiction [Member]
Income Taxes [Line Items]
Operating loss carry forwards		$ 13,900,000
Tax Credit Carryforward, Amount		$ 157,000
Minimum [Member] | Federal Jurisdiction [Member]
Income Taxes [Line Items]
Operating loss carry forward expiration year		2031

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Amount of bad debt reserves for tax purposes of qualified lenders excluded in calculating deferred taxes.

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