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Employee Benefit Plans - Additional Information (Detail) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 USD ($) Employee shares | Dec. 31, 2020 USD ($) Employee shares | Dec. 31, 2019 USD ($) Employee shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Minimum percentage of eligible compensation on a pre-tax or post-tax basis for eligible employees to save | 1.00% |  |
Employee contribution matching percentage | 50.00% |  |
Percentage of total eligible compensation, contribution by Bank, maximum limit | 6.00% |  |
Vesting percentage in participant's deferral contributions and employer matching contributions | 100.00% |  |
Vesting period | 6 years |  |
Defined contribution plan employer matching contribution description | In order to be eligible for discretionary contributions, employees must work 1,000 hours in the plan year and be employed on the last day of the year. |  |
Employer matching contribution and the discretionary contribution | $ | $ 1,500 | $ 1,000 | $ 1,200
Restricted stock awards, shares issued | 48,750 | 37,382 | 38,100
Awards grants originated in 2016, 2017 and 2018 [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of employees, received the stock | Employee |  |  | 3
Four employees received shares from awards granted due to retirement |  |  | 14,300
Awards grants originated in 2019, 2018 and 2017 [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of employees, received the stock | Employee |  | 1 |
Number of shares vested |  | 1,050 |
Awards grants originated in 2017, 2018 and 2019 and 2020 [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of employees, received the stock | Employee |  | 8 |
Number of shares vested |  | 10,890 |
Awards grants originated in 2018, 2019 and 2020 [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of employees, received the stock | Employee | 7 |  |
Number of shares vested | 4,425 |  |
Restricted Stock Awards [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 3 years |  |
Restricted stock awards, shares issued | 48,750 | 37,382 | 38,100
Stock issued to number of employees | Employee | 96 | 92 | 94
Shares vest under the plan | 100.00% | 100.00% | 100.00%
Shares forfeited due to employee termination | 2,575 | 2,175 | 3,220
Number of shares vested | 23,270 | 35,431 | 40,370
Number of employees, received the stock | Employee | 50 | 58 | 63
Number of shares vested | 4,425 | 10,890 | 14,300
Compensation expense | $ | $ 822 | $ 1,000 | $ 1,100
Unrecognized compensation cost related to the nonvested portion of restricted stock awards under the plan | $ | $ 1,500 |  |
Unrecognized compensation cost related to the nonvested portion of restricted stock awards under the plan, period for recognition | 3 years |  |
Restricted Stock Awards [Member] | 2018 [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of shares vested | 18,845 |  |
Number of employees, received the stock | Employee | 50 |  |
Restricted Stock Awards [Member] | 2019 [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of shares vested |  | 1,600 |
Number of employees, received the stock | Employee |  | 3 |
Restricted Stock Awards [Member] | 2016 [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of shares vested |  |  | 26,070
Number of employees, received the stock | Employee |  |  | 63
Restricted Stock Awards [Member] | 2017 [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of shares vested |  | 21,340 |
Number of employees, received the stock | Employee |  | 53 |
Restricted Stock Awards [Member] | Immediate Vesting [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of employees, received the stock | Employee |  | 1 |
Number of shares vested |  | 551,000 |

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