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Pay vs Performance Disclosure | 12 Months Ended
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Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Pay vs Performance Disclosure |  |  |  |
Pay vs Performance Disclosure, Table | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Value of Initial Fixed $100 | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Investment Based On: | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Summary | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Average | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Compensation | ​ | Compensation | ​ | ​ | ​ | ​ | Compensation | ​ | ​ | ​ | Peer Group TSR | ​ | ​ | ​ | ​ | ​
​ | ​ | Table (SCT) Total | ​ | Actually | ​ | Average SCT | ​ | Actually Paid to | ​ | ​ | ​ | (S&P Regional | ​ | ​ | ​ | ​ | Return on
CEO | Year(1) | for CEO |  | Paid to CEO(2) |  | Total for NEOs(5) |  | NEOs(2,5) |  | BMRC TSR |  | Banks Index)(3) |  | Net Income |  | Assets(4)
Myers | 2023 | $ | 1,129,808 | ​ | $ | 930,468 | ​ | $ | 564,484 | ​ | $ | 483,277 | ​ | 99.6 | ​ | 100.0 | ​ | $ | 19,895,000 | ​ | 0.49
Myers | 2022 | $ | 1,272,044 | ​ | ​ | 1,324,463 | ​ | ​ | 666,614 | ​ | ​ | 681,568 | ​ | 79.5 | ​ | 110.5 | ​ | ​ | 46,586,044 | ​ | 1.08
Myers | 2021 | $ | 809,192 | ​ | $ | 802,655 | ​ | $ | 547,188 | ​ | $ | 541,064 | ​ | 87.5 | ​ | 129.6 | ​ | $ | 33,228,231 | ​ | 0.94
Colombo | 2021 | $ | 1,262,094 | ​ | $ | 1,166,115 | ​ | ​ | 547,188 | ​ | ​ | 541,064 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Colombo | 2020 | $ | 1,136,968 | ​ | $ | 817,940 | ​ | $ | 539,038 | ​ | $ | 463,236 | ​ | 78.6 | ​ | 92.7 | ​ | $ | 30,242,498 | ​ | 1.04
​
| (1) | Mr. Colombo retired as CEO effective October 31, 2021. Mr. Myers was appointed CEO effective November 1, 2021. Therefore, we provide both incumbent comparisons in 2021.
| (2) | Amounts represent compensation actually paid to our CEO and the average compensation actually paid to our remaining NEOs for the relevant fiscal year, as determined under SEC rules. Compensation actually paid to our NEOs represents the “Total” compensation reported in the Summary Compensation Table for the applicable fiscal year, as adjusted as follows. Reconciliation of adjustments made to SCT to arrive at CAP for the CEO and average NEO:
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | CEO
​ |  | 2023 (Myers) |  | 2022 (Myers) |  | 2021 (Myers) |  | 2021 (Colombo) |  | 2020 (Colombo)
SCT | ​ | ​ | 1,129,808 | ​ | $ | 1,272,044 | ​ | $ | 809,192 | ​ | $ | 1,262,094 | ​ | $ | 1,136,968
Equity awards reported in SCT | ​ | ​ | (272,031) | ​ | $ | (294,414) | ​ | $ | (153,988) | ​ | $ | (247,290) | ​ | $ | (237,771)
Pension amount reported in SCT | ​ | ​ | (84,544) | ​ | $ | (94,763) | ​ | $ | (59,356) | ​ | $ | (97,586) | ​ | $ | (94,664)
Pension value attributable to current years’ service | ​ | ​ | 84,544 | ​ | ​ | 82,638 | ​ | ​ | 54,174 | ​ | ​ | 0 | ​ | ​ | 0
FV of equity granted in current year | ​ | ​ | 160,698 | ​ | $ | 362,628 | ​ | $ | 124,745 | ​ | $ | 197,416 | ​ | $ | 226,175
Dividends paid on unvested shares and stock options (SOs) | ​ | ​ | 23,728 | ​ | $ | 13,643 | ​ | $ | 7,183 | ​ | $ | 13,931 | ​ | $ | 14,033
Change in FV Equity | ​ | ​ | (111,735) | ​ | $ | (17,313) | ​ | $ | 20,704 | ​ | ​ | 37,550 | ​ | ​ | (226,801)
CAP | ​ | ​ | 930,468 | ​ | $ | 1,324,463 | ​ | $ | 802,655 | ​ | $ | 1,166,115 | ​ | $ | 817,940
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Average NEO
​ | ​ | ​ | 2023 |  | 2022 |  | 2021 |  | 2020
SCT | ​ | ​ | 564,484 | ​ | $ | 666,614 | ​ | $ | 547,188 | ​ | $ | 539,038
Equity awards reported in SCT | ​ | ​ | (94,460) | ​ | $ | (134,615) | ​ | $ | (77,966) | ​ | $ | (86,260)
Pension amount reported in SCT | ​ | ​ | (53,024) | ​ | $ | (51,605) | ​ | $ | (44,699) | ​ | $ | (48,660)
Pension value attributable to current years’ service | ​ | ​ | 49,217 | ​ | ​ | 44,768 | ​ | ​ | 35,101 | ​ | ​ | 35,892
FV of equity granted in current year | ​ | ​ | 57,675 | ​ | $ | 161,832 | ​ | $ | 65,506 | ​ | $ | 74,960
Dividends paid on unvested shares and stock options (SOs) | ​ | ​ | 9,129 | ​ | ​ | 6,443 | ​ | ​ | 3,517 | ​ | ​ | 6,338
Change in FV Equity | ​ | ​ | (49,744) | ​ | $ | (11,869) | ​ | $ | 12,417 | ​ | $ | (58,073)
CAP | ​ | ​ | 483,277 | ​ | $ | 681,568 | ​ | $ | 541,064 | ​ | $ | 463,236
​
| 3) | Based on initial investment of $100 and a cumulative Total Shareholder Return of BMRC & S&P Regional Banks Select Industry Index.
| 4) | Return on Average Assets is the company selected measure.
| 5) | The following non-CEO NEOs are included in the average figures shown:
2023: Campbell, Girton, Sloan and Stewart 2022: Campbell, Girton, Sloan and Stewart 2021: Campbell, Girton, Stewart and Reizman 2020: Burke, Girton, Myers and Reizman |  |  |
Company Selected Measure Name | Return on Average Assets |  |  |
Named Executive Officers, Footnote |
| (1) | Mr. Colombo retired as CEO effective October 31, 2021. Mr. Myers was appointed CEO effective November 1, 2021. Therefore, we provide both incumbent comparisons in 2021.
| 5) | The following non-CEO NEOs are included in the average figures shown:
2023: Campbell, Girton, Sloan and Stewart 2022: Campbell, Girton, Sloan and Stewart 2021: Campbell, Girton, Stewart and Reizman 2020: Burke, Girton, Myers and Reizman |  |  |
Peer Group Issuers, Footnote |
| 3) | Based on initial investment of $100 and a cumulative Total Shareholder Return of BMRC & S&P Regional Banks Select Industry Index.
Adjustment To PEO Compensation, Footnote |
| (2) | Amounts represent compensation actually paid to our CEO and the average compensation actually paid to our remaining NEOs for the relevant fiscal year, as determined under SEC rules. Compensation actually paid to our NEOs represents the “Total” compensation reported in the Summary Compensation Table for the applicable fiscal year, as adjusted as follows. Reconciliation of adjustments made to SCT to arrive at CAP for the CEO and average NEO:
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | CEO
​ |  | 2023 (Myers) |  | 2022 (Myers) |  | 2021 (Myers) |  | 2021 (Colombo) |  | 2020 (Colombo)
SCT | ​ | ​ | 1,129,808 | ​ | $ | 1,272,044 | ​ | $ | 809,192 | ​ | $ | 1,262,094 | ​ | $ | 1,136,968
Equity awards reported in SCT | ​ | ​ | (272,031) | ​ | $ | (294,414) | ​ | $ | (153,988) | ​ | $ | (247,290) | ​ | $ | (237,771)
Pension amount reported in SCT | ​ | ​ | (84,544) | ​ | $ | (94,763) | ​ | $ | (59,356) | ​ | $ | (97,586) | ​ | $ | (94,664)
Pension value attributable to current years’ service | ​ | ​ | 84,544 | ​ | ​ | 82,638 | ​ | ​ | 54,174 | ​ | ​ | 0 | ​ | ​ | 0
FV of equity granted in current year | ​ | ​ | 160,698 | ​ | $ | 362,628 | ​ | $ | 124,745 | ​ | $ | 197,416 | ​ | $ | 226,175
Dividends paid on unvested shares and stock options (SOs) | ​ | ​ | 23,728 | ​ | $ | 13,643 | ​ | $ | 7,183 | ​ | $ | 13,931 | ​ | $ | 14,033
Change in FV Equity | ​ | ​ | (111,735) | ​ | $ | (17,313) | ​ | $ | 20,704 | ​ | ​ | 37,550 | ​ | ​ | (226,801)
CAP | ​ | ​ | 930,468 | ​ | $ | 1,324,463 | ​ | $ | 802,655 | ​ | $ | 1,166,115 | ​ | $ | 817,940
Non-PEO NEO Average Total Compensation Amount | $ 564,484 | $ 666,614 | $ 547,188 | $ 539,038
Non-PEO NEO Average Compensation Actually Paid Amount | $ 483,277 | 681,568 | 541,064 | 463,236
Adjustment to Non-PEO NEO Compensation Footnote |
| (2) | Amounts represent compensation actually paid to our CEO and the average compensation actually paid to our remaining NEOs for the relevant fiscal year, as determined under SEC rules. Compensation actually paid to our NEOs represents the “Total” compensation reported in the Summary Compensation Table for the applicable fiscal year, as adjusted as follows. Reconciliation of adjustments made to SCT to arrive at CAP for the CEO and average NEO:
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Average NEO
​ | ​ | ​ | 2023 |  | 2022 |  | 2021 |  | 2020
SCT | ​ | ​ | 564,484 | ​ | $ | 666,614 | ​ | $ | 547,188 | ​ | $ | 539,038
Equity awards reported in SCT | ​ | ​ | (94,460) | ​ | $ | (134,615) | ​ | $ | (77,966) | ​ | $ | (86,260)
Pension amount reported in SCT | ​ | ​ | (53,024) | ​ | $ | (51,605) | ​ | $ | (44,699) | ​ | $ | (48,660)
Pension value attributable to current years’ service | ​ | ​ | 49,217 | ​ | ​ | 44,768 | ​ | ​ | 35,101 | ​ | ​ | 35,892
FV of equity granted in current year | ​ | ​ | 57,675 | ​ | $ | 161,832 | ​ | $ | 65,506 | ​ | $ | 74,960
Dividends paid on unvested shares and stock options (SOs) | ​ | ​ | 9,129 | ​ | ​ | 6,443 | ​ | ​ | 3,517 | ​ | ​ | 6,338
Change in FV Equity | ​ | ​ | (49,744) | ​ | $ | (11,869) | ​ | $ | 12,417 | ​ | $ | (58,073)
CAP | ​ | ​ | 483,277 | ​ | $ | 681,568 | ​ | $ | 541,064 | ​ | $ | 463,236
Compensation Actually Paid vs. Total Shareholder Return | ​ |  |  |
Compensation Actually Paid vs. Net Income | ​ |  |  |
Compensation Actually Paid vs. Company Selected Measure | ​ |  |  |
Total Shareholder Return Vs Peer Group | ​ |  |  |
Tabular List, Table | Pay Versus Performance Tabular List We believe the following performance measures represent the most important financial performance measures used by us to link compensation actually paid to our NEOs for the fiscal year ended December 31, 2023: Return on Average Assets Efficiency Ratio Total Loan Growth Total Deposit Growth Diluted EPS Growth NPAs to Assets For additional details regarding our most important financial performance measures, please see the discussion in the Compensation Discussion and Analysis (CD&A) section in this Proxy Statement. |  |  |
Total Shareholder Return Amount | $ 99.6 | 79.5 | 87.5 | 78.6
Peer Group Total Shareholder Return Amount | 100.0 | 110.5 | 129.6 | 92.7
Net Income (Loss) | $ 19,895,000 | $ 46,586,044 | $ 33,228,231 | $ 30,242,498
Company Selected Measure Amount | 0.49 | 1.08 | 0.94 | 1.04
PEO Name | Myers |  |  |
Measure:: 1 |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Name | Return on Average Assets |  |  |
Non-GAAP Measure Description |
| 4) | Return on Average Assets is the company selected measure.
Measure:: 2 |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Name | Efficiency Ratio |  |  |
Measure:: 3 |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Name | Total Loan Growth |  |  |
Measure:: 4 |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Name | Total Deposit Growth |  |  |
Measure:: 5 |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Name | Diluted EPS Growth |  |  |
Measure:: 6 |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Name | NPAs to Assets |  |  |
Myers |  |  |  |
Pay vs Performance Disclosure |  |  |  |
PEO Total Compensation Amount | $ 1,129,808 | $ 1,272,044 | $ 809,192 |
PEO Actually Paid Compensation Amount | 930,468 | 1,324,463 | 802,655 |
Colombo |  |  |  |
Pay vs Performance Disclosure |  |  |  |
PEO Total Compensation Amount |  |  | 1,262,094 | $ 1,136,968
PEO Actually Paid Compensation Amount |  |  | 1,166,115 | 817,940
PEO | Myers | Equity awards reported in SCT |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | (272,031) | (294,414) | (153,988) |
PEO | Myers | Pension amount reported in SCT |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | (84,544) | (94,763) | (59,356) |
PEO | Myers | Pension value attributable to current years' service |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | 84,544 | 82,638 | 54,174 |
PEO | Myers | FV of equity granted in current year |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | 160,698 | 362,628 | 124,745 |
PEO | Myers | Dividends paid on unvested shares and stock options (SOs) |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | 23,728 | 13,643 | 7,183 |
PEO | Myers | Change in FV Equity |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | (111,735) | (17,313) | 20,704 |
PEO | Colombo | Equity awards reported in SCT |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount |  |  | (247,290) | (237,771)
PEO | Colombo | Pension amount reported in SCT |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount |  |  | (97,586) | (94,664)
PEO | Colombo | Pension value attributable to current years' service |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount |  |  | 0 | 0
PEO | Colombo | FV of equity granted in current year |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount |  |  | 197,416 | 226,175
PEO | Colombo | Dividends paid on unvested shares and stock options (SOs) |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount |  |  | 13,931 | 14,033
PEO | Colombo | Change in FV Equity |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount |  |  | 37,550 | (226,801)
Non-PEO NEO | Equity awards reported in SCT |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | (94,460) | (134,615) | (77,966) | (86,260)
Non-PEO NEO | Pension amount reported in SCT |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | (53,024) | (51,605) | (44,699) | (48,660)
Non-PEO NEO | Pension value attributable to current years' service |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | 49,217 | 44,768 | 35,101 | 35,892
Non-PEO NEO | FV of equity granted in current year |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | 57,675 | 161,832 | 65,506 | 74,960
Non-PEO NEO | Dividends paid on unvested shares and stock options (SOs) |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | 9,129 | 6,443 | 3,517 | 6,338
Non-PEO NEO | Change in FV Equity |  |  |  |
Pay vs Performance Disclosure |  |  |  |
Adjustment to Compensation, Amount | $ (49,744) | $ (11,869) | $ 12,417 | $ (58,073)

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