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Stock-Based Compensation Plans (Additional Information) (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
May 01, 2012 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Cash used to settle stock based compensation transactions |  | $ 629 | $ 374 | $ 455
Unrecognized compensation cost for nonvested stock options |  | 0 | 0 | 0
Cash received from exercise of stock options |  | $ 159 | $ 33 | $ 95
Percentage of total compensation |  | 4.00% |  |
Granted |  | 0 | 0 | 0
Stock Option and Incentive Plan 2003 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Maximum number of shares of stock reserved and available for issuance | 1,200,000 |  |  |
Stock Option and Incentive Plan 2012 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock based compensation, option granted, contractual life |  | 10 years |  |
Stock based compensation, vesting period |  | 5 years |  |
Stock Options [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation |  | $ 0 | $ 4 | $ 7
Tax benefit from share based compensation |  | 23 | 7 | 8
Total intrinsic value of options exercised |  | 146 | 90 | 309
Stock Options [Member] | SBM Financial, Inc. [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Tax benefit from share based compensation |  | 1 | 1 | 1
Restricted Stock Units (RSUs) [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Grant date fair value of share based awards |  | 994 | 500 | 657
Share-based compensation |  | 610 | 475 | 389
Tax benefit from share based compensation |  | $ 131 | 102 | 84
Granted |  | 20,689 |  |
Restricted Stock [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Grant date fair value of share based awards |  | $ 924 | 1,000 | 724
Share-based compensation |  | 895 | 781 | 751
Tax benefit from share based compensation |  | $ 192 | 168 | 161
Granted |  | 19,538 |  |
Management Stock Purchase Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Grant date fair value of share based awards |  | $ 157 | 83 | 85
Share-based compensation |  | 104 | 71 | 95
Tax benefit from share based compensation |  | 22 | 15 | 20
Cash received from issuance of share based awards |  | $ 324 | 247 | 250
Granted |  | 9,619 |  |
Management Stock Purchase Plan [Member] | Interest and Other Liabilities [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Cash received from issuance of share based awards |  | $ 554 | 455 |
Long-Term Performance Share Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation |  | 637 | 332 | 532
Tax benefit from share based compensation |  | 137 | 71 | 114
Total intrinsic value of options exercised |  | $ 753 | 978 | 624
Performance period |  | 3 years |  |
Granted |  | 17,822 |  |
Deferred Stock Awards [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Grant date fair value of share based awards |  | $ 247 | 169 | 153
Share-based compensation |  | 135 | 122 | 110
Tax benefit from share based compensation |  | $ 29 | $ 26 | $ 24
Percentage of total compensation |  | 10.00% |  |
Percentage vested on 65th birthday |  | 100.00% |  |
Qualified Stock Options [Member] | Stock Option and Incentive Plan 2012 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Exercise price as a percentage of fair market value on the date of grant | 100.00% |  |  |
Nonqualified Stock Options [Member] | Stock Option and Incentive Plan 2012 [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Exercise price as a percentage of fair market value on the date of grant | 85.00% |  |  |

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