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Pay vs Performance Disclosure | 12 Months Ended
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Dec. 31, 2022 USD ($) $ / shares | Dec. 31, 2021 USD ($) $ / shares | Dec. 31, 2020 USD ($) $ / shares
Pay vs Performance Disclosure [Table] |  |  |
Pay vs Performance [Table Text Block] |
Year | Summary Compensation Table Total for CEO | Compensation Actually Paid to CEO | Average Summary Compensation Table Total for non-CEO Named Executive Officers | Average Compensation Actually Paid to non-CEO Named Executive Officers | Value of Fixed $100 Investment Based On: | Net Income | Company Selected Measure: Diluted EPS
Total Shareholder Return | Peer Group Total Shareholder Return
($) | ($)(1)(2) | ($)(2) | ($)(1)(2) | ($) | ($)(3) | ($) | ($)
2022 | 1,323,221 |  | 1,596,289 |  | 512,046 | 476,400 | 100.49 | 111.47 |  | 61,439,377 |  | 4.17 |
2021 | 2,375,909 |  | 2,306,068 |  | 594,080 | 638,100 | 112.11 | 126.43 |  | 69,013,710 |  | 4.60 |
2020 | 3,088,311 |  | 1,606,062 |  | 627,250 | 415,542 | 80.73 | 90.82 |  | 59,486,202 |  | 3.95 |
Company Selected Measure Name | Diluted EPS |  |
Named Executive Officers, Footnote [Text Block] | The CEO and all other named executive officers included in average summary compensation were as follows for each year indicated:
| 2022 | 2021 | 2020
CEO | Gregory A. Dufour | Gregory A. Dufour | Gregory A. Dufour
Other Named Executive Officers | Michael R. Archer | Gregory A. White | Gregory A. White (a)
William H. Martel | William H. Martel | Joanne T. Campbell
Timothy P. Nightingale | Timothy P. Nightingale | Timothy P. Nightingale
Patricia A. Rose | Patricia A. Rose | Patricia A. Rose
|  | Deborah A. Jordan (a)
a) Mr. White was appointed as EVP, CFO of the Company, effective April 15, 2020, at which time Ms. Jordan relinquished her role as EVP, CFO and retired from the Company effective June 10, 2020. For purposes of calculating the average summary compensation for the named executive officers, the amounts used for purposes of determining each named executive officer's compensation only reflect the period that they were employed by the Company. |  |
Peer Group Issuers, Footnote [Text Block] | The peer group TSR was calculated using the S&P U.S. SmallCap Banks Index as of December 31, 2022, which differs from our industry index used to assess relative performance of ROAE under the LTIP. Refer to the LTIP section beginning on page 53 above. |  |
PEO Total Compensation Amount | $ 1,323,221 | $ 2,375,909 | $ 3,088,311
PEO Actually Paid Compensation Amount | $ 1,596,289 | 2,306,068 | 1,606,062
Adjustment To PEO Compensation, Footnote [Text Block] | CAP to CEO was calculated as follows:
Year | Summary Compen-sation Table Total for CEO | Change in Pension Value | Fair Value of Current Year Equity Awards at Grant Date | Pension value attributable to Current Year's Service Cost | Fair Value of Current Year Equity Awards at 12/31/2022 | Dividends paid on restricted stock | Change in Fair Value of Prior Years' Awards Unvested at 12/31/2022 | Change in Fair Value of Prior Years' Awards That Vested in 2022 | Fair Value of Awards Forfeited During 2022 | Compen-sation Actually Paid to CEO
($) | ($) | ($) (a) | ($) | ($)(a) | ($) | ($)(a) | ($)(a) | ($) | ($)
2022 | 1,323,221 |  | — |  | (329,977) |  | 403,598 |  | 324,139 |  | 2,541 |  | (48,298) |  | (78,935) |  | — |  | 1,596,289 |
2021 | 2,375,909 |  | (820,719) |  | (342,314) |  | 376,267 |  | 378,633 |  | — |  | 283,937 |  | 54,355 |  | — |  | 2,306,068 |
2020 | 3,088,311 |  | (1,716,445) |  | (348,204) |  | 349,348 |  | 383,419 |  | — |  | (40,985) |  | (109,382) |  | — |  | 1,606,062 |
Non-PEO NEO Average Total Compensation Amount | $ 512,046 | 594,080 | 627,250
Non-PEO NEO Average Compensation Actually Paid Amount | $ 476,400 | 638,100 | 415,542
Adjustment to Non-PEO NEO Compensation Footnote [Text Block] | Average summary compensation actually paid to non-CEO named executive officers was calculated as follows:
Year | Average Summary Compensation Table Total for non-CEO Named Executive Officers | Change in Pension Value | Fair Value of Current Year Equity Awards at Grant Date | Pension value attributable to Current Year's Service Cost | Fair Value of Current Year Equity Awards at 12/31/2022 | Dividends paid on restricted stock | Change in Fair Value of Prior Years' Awards Unvested at 12/31/2022 | Change in Fair Value of Prior Years' Awards That Vested in 2022 | Fair Value of Awards Forfeited During 2022 | Average Summary Compen-sation Actually Paid to non-CEO Named Executive Officers
($) | ($) | ($) (a) | ($) | ($)(a) | ($) | ($)(a) | ($)(a) | ($) | ($)
2022 | 512,046 |  | — |  | (92,679) |  | — |  | 88,998 |  | 663 |  | (14,010) |  | (18,618) |  |  | 476,400 |
2021 | 594,080 |  | — |  | (98,392) |  | — |  | 108,264 |  | — |  | 61,133 |  | 24,136 |  | (51,121) |  | 638,100 |
2020 | 627,250 |  | (133,519) |  | (86,367) |  | 23,015 |  | 73,456 |  | — |  | (8,656) |  | (36,156) |  | (43,481) |  | 415,542 |
a) Fair value was computed in accordance with the Company's methodology used for financial reporting purposes. |  |
Compensation Actually Paid vs. Total Shareholder Return [Text Block] | Cumulative TSR - The table below shows the relationship between CAP to CEO and the average of CAP to all other named executive officers, and the Company's TSR and peer group TSR for the period December 31, 2019 through December 31, 2022. The table assumes a $100 investment on December 31, 2019 and measures the amount by which the market value, assuming the reinvestment of dividends, has changed as of December 31, 2022: The SEC requires companies to compare CAP to CEO and all other named executive officers to cumulative TSR however, we do not link CEO or all other named executive officers compensation to our cumulative TSR. |  |
Compensation Actually Paid vs. Net Income [Text Block] | Net Income - The table below shows the relationship between CAP to CEO and the average of the CAP to all other named executive officers and the Company's net income: The SEC requires companies to compare CAP to CEO and all other named executive officers to net income; however, we do not link CEO or all other named executive officers compensation to net income. |  |
Compensation Actually Paid vs. Company Selected Measure [Text Block] | Diluted EPS - The table below shows the relationship between CAP to CEO and the average of the CAP to all other named executive officers and the Company's diluted EPS: Diluted EPS is used by the Company to determine incentive payouts for all named executive officers, including the CEO, under the Company's LTIP |  |
Tabular List [Table Text Block] |
Financial Performance Measures (1)
Diluted EPS
Relative Return on Average Equity
Net Income Before Taxes (NIBT)
Total Shareholder Return Amount | $ 100.49 | 112.11 | 80.73
Peer Group Total Shareholder Return Amount | 111.47 | 126.43 | 90.82
Net Income (Loss) | $ 61,439,377 | $ 69,013,710 | $ 59,486,202
Company Selected Measure Amount | $ / shares | 4.17 | 4.60 | 3.95
PEO Name | Gregory A. Dufour | Gregory A. Dufour | Gregory A. Dufour
Measure [Axis]: 1 |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Measure Name | Diluted EPS |  |
Measure [Axis]: 2 |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Measure Name | Relative Return on Average Equity |  |
Measure [Axis]: 3 |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Measure Name | Net Income Before Taxes (NIBT) |  |
PEO [Member] | Change in Pension Value [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | $ 0 | $ (820,719) | $ (1,716,445)
PEO [Member] | Equity Award Adjustments [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | (329,977) | (342,314) | (348,204)
PEO [Member] | Pension Adjustments, Service Cost [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | 403,598 | 376,267 | 349,348
PEO [Member] | Equity Awards Reported Value [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | 324,139 | 378,633 | 383,419
PEO [Member] | Equity Awards, Value of Dividends Paid Adjustment [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | 2,541 | 0 | 0
PEO [Member] | Equity Awards Granted in Prior Years, Unvested [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | (48,298) | 283,937 | (40,985)
PEO [Member] | Equity Awards Granted in Prior Years, Vested [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | (78,935) | 54,355 | (109,382)
PEO [Member] | Equity Awards Forfeited During the Year [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | 0 | 0 | 0
Non-PEO NEO [Member] | Change in Pension Value [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | 0 | 0 | (133,519)
Non-PEO NEO [Member] | Equity Award Adjustments [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | (92,679) | (98,392) | (86,367)
Non-PEO NEO [Member] | Pension Adjustments, Service Cost [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | 0 | 0 | 23,015
Non-PEO NEO [Member] | Equity Awards Reported Value [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | 88,998 | 108,264 | 73,456
Non-PEO NEO [Member] | Equity Awards, Value of Dividends Paid Adjustment [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | 663 | 0 | 0
Non-PEO NEO [Member] | Equity Awards Granted in Prior Years, Unvested [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | (14,010) | 61,133 | (8,656)
Non-PEO NEO [Member] | Equity Awards Granted in Prior Years, Vested [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount | (18,618) | 24,136 | (36,156)
Non-PEO NEO [Member] | Equity Awards Forfeited During the Year [Member] |  |  |
Pay vs Performance Disclosure [Table] |  |  |
Adjustment to Compensation Amount |  | $ (51,121) | $ (43,481)

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