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Share-based Compensation - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2021 USD ($) Plan Bank $ / shares shares | Dec. 31, 2020 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of incentive plans | Plan | 1 |  |
Unrecognized compensation expense |  | $ 1,800,000 |
Weighted average period cost expected to be recognized |  | 1 year 7 months 6 days |
Stock options, expiration term from date of grant | 10 years |  |
Share-based compensation expense | $ 2,436,000 | $ 2,544,000 | $ 3,125,000
Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Period of continuous service | 3 years |  |
Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Period of continuous service | 5 years |  |
2013 Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of shares of common stock to be granted under equity incentive awards | shares | 1,500,000 |  |
Shares available for issuance under the Plan | shares | 1,420,485 |  |
2013 and 2021 Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized compensation expense | $ 0 |  |
Options granted in period (shares) | shares | 0 |  |
Stock options, expiration term from date of grant | 10 years |  |
2013 and 2021 Plan | Restricted stock awards |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized compensation expense | $ 1,800,000 |  |
Weighted average period cost expected to be recognized | 1 year 7 months 6 days |  |
Total fair value of vested shares | $ 2,700,000 | $ 1,400,000 | $ 2,100,000
Number of shares granted | shares | 75,679 | 125,896 | 181,204
Grant date fair value, vested | $ / shares | $ 16.01 | $ 24.68 | $ 27.56
2013 and 2021 Plan | Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Period of continuous service | 3 years |  |
2013 and 2021 Plan | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Period of continuous service | 5 years |  |
2013 Equity Compensation Plan | Performance Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock options, expiration term from date of grant | 3 years |  |
Total fair value of vested shares | $ 1,000,000.0 |  |
Number of shares granted | shares | 42,626 |  |
Total fair value of granted shares | $ 392,000 |  |
Share-based compensation arrangement by share-based payment award, vesting rights | Each PSU that vests entitles the recipient to receive one share of the Company’s common stock on a specified issuance date |  |
Grant date fair value, vested | $ / shares | $ 18.40 |  |
Number of regional banks | Bank | 47 |  |
Share-based compensation expense | $ 77,000 |  |

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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition 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). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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