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Stock-Based Compensation - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	27,128
Weighted-average grant date fair value (in dollars per share)	$ 25.41
Income tax benefit from share-based compensation	$ 283,000	$ 324,000	$ 325,000
Number of authorized stock-based awards available for grant (in shares)	506,483
Vested (in shares)	41,948
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	40,978	40,108	39,673
Unrecognized compensation cost related to nonvested restricted stock	$ 1,026,000	$ 1,182,000
Fair value of shares vesting during period	1,462,000	1,535,000	$ 1,035,000
Compensation expense	$ 1,346,000	$ 1,545,000	$ 928,000
Performance Based Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	16,681	15,657	7,109
Unrecognized compensation cost related to nonvested restricted stock	$ 285
Fair value of shares vesting during period	21,000
Compensation expense	$ 221,000	$ 314,000	$ 93,000
Shared for future period (in shares)	1,242
Vested (in shares)	798
Two Thousand And Nineteen Performance Based Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested (in shares)	726
Two Thousand And Eighteen Performance Based Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested (in shares)	1,314
Two Thousand And Nineteen and Two Thousand And Eighteen Performance Based Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested (in shares)	2,040
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	13,850
Weighted-average grant date fair value (in dollars per share)	$ 25.27

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Amount of increase in additional paid in capital (APIC) resulting from a tax benefit associated with share-based compensation plan other than an employee stock ownership plan (ESOP). Includes, but is not limited to, excess tax benefit.

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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