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Minimum Regulatory Capital Requirements - Additional Information (Detail) $ in Millions		1 Months Ended
	Jul. 31, 2018 USD ($)	Aug. 31, 2018 USD ($)	Dec. 31, 2020 USD ($)	Jun. 30, 2020	Apr. 30, 2020	Mar. 27, 2020	Dec. 31, 2019	Dec. 31, 2016
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Minimum leverage ratio calculated as ratio of Tier 1 capital to average quarterly assets			9.00%
Retained earnings is available to pay dividends			$ 29.8
Community Bank [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Minimum leverage ratio calculated as ratio of Tier 1 capital to average quarterly assets			9.00%			8.00%
Banking organizations with minimum leverage ratios					8
Banking organizations leverage ratios maximum requirement					8
Banking organization maintains leverage ratio minimum					7
Minimum leverage ratio for second through fourth quarters of 2020				8.00%
Minimum leverage ratio for 2021				8.50%
Minimum leverage ratio thereafter				9.00%
Maximum leverage ratio basis points				10.00%
Common Equity Tier 1 Capital [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Capital conservation buffer at base level								0.625%
Capital conservation buffer			2.50%				2.50%
Maximum [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Regulatory capital requirement consolidated total asset	$ 1,000.0	$ 3,000.0
Maximum [Member] | Community Bank [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Temporary transition leverage ratios requirement					9.00%
Minimum [Member] | Community Bank [Member]
Compliance With Regulatory Capital Requirements Under Banking Regulations [Line Items]
Temporary transition leverage ratios requirement					8.00%

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Maximum leverage ratio basis points.

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Minimum leverage ratio due year two.

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Minimum leverage ratio remainder of fiscal year.

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Minimum leverage ratio thereafter.

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Minimum requirement leverage ratio.

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Regulatory capital requirement consolidated total asset.

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Retained earnings is available to pay dividends.

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- Definition

Risk weighted assets capital conservation buffer.

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Risk weighted assets capital conservation buffer at base level.

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Temporary transition leverage ratios requirement.

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- Definition

Ratio of Tier 1 leverage capital to average assets exceeding minimum required for capital adequacy as defined by regulatory framework.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826

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Ratio of Tier 1 risk-based capital to total leverage exposure as defined by regulatory framework.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
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Ratio of minimum Tier 1 leverage capital to average assets required for capital adequacy as defined by regulatory framework.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
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-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958570-112826

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-Paragraph 1
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826

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