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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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- 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 + Details
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