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Pay vs Performance Disclosure | 12 Months Ended
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Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | 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 | ​ | ​ | ​ | ​ | Return
​ | ​ | ​ | ​ | ​ | Table (SCT) Total | ​ | ​ | Actually | ​ | ​ | Average SCT | ​ | ​ | Actually Paid to | ​ | ​ | ​ | (S&P Regional | ​ | ​ | ​ | ​ | 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 | ​ | 2024 | ​ | $ | 1,367,529 | ​ | $ | 1,328,432 | ​ | $ | 627,922 | ​ | $ | 616,889 | ​ | 99.6 | ​ | 100.2 | ​ | $ | (8,409,000) | ​ | (0.22)
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) | Reconciliation of adjustments made to SCT to arrive at CAP for the CEO and average NEO:
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | CEO
​ |  | 2024 (Myers) |  | 2023 (Myers) |  | 2022 (Myers) |  | 2021 (Myers) |  | 2021 (Colombo) |  | 2020 (Colombo)
SCT | ​ | $ | 1,367,529 | ​ | $ | 1,129,808 | ​ | $ | 1,272,044 | ​ | $ | 809,192 | ​ | $ | 1,262,094 | ​ | $ | 1,136,968
Equity awards reported in SCT | ​ | $ | (299,273) | ​ | $ | (272,031) | ​ | $ | (294,414) | ​ | $ | (153,988) | ​ | $ | (247,290) | ​ | $ | (237,771)
Pension amount reported in SCT | ​ | $ | (89,464) | ​ | $ | (84,544) | ​ | $ | (94,763) | ​ | $ | (59,356) | ​ | $ | (97,586) | ​ | $ | (94,664)
Pension value attributable to current years' service | ​ | ​ | 89,464 | ​ | ​ | 84,544 | ​ | ​ | 82,638 | ​ | ​ | 54,174 | ​ | ​ | 0 | ​ | ​ | 0
FV of equity granted in current year | ​ | $ | 244,736 | ​ | $ | 160,698 | ​ | $ | 362,628 | ​ | $ | 124,745 | ​ | $ | 197,416 | ​ | $ | 226,175
Dividends paid on unvested shares and stock options (SOs) | ​ | $ | 45,249 | ​ | $ | 23,728 | ​ | $ | 13,643 | ​ | $ | 7,183 | ​ | $ | 13,931 | ​ | $ | 14,033
Change in FV Equity | ​ | $ | (29,809) | ​ | $ | (111,735) | ​ | $ | (17,313) | ​ | $ | 20,704 | ​ | ​ | 37,550 | ​ | ​ | (226,801)
CAP | ​ | $ | 1,328,432 | ​ | $ | 930,468 | ​ | $ | 1,324,463 | ​ | $ | 802,655 | ​ | $ | 1,166,115 | ​ | $ | 817,940
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Average NEO
​ |  | ​ | 2024 |  | ​ | 2023 |  | 2022 |  | 2021 |  | 2020
SCT | ​ | $ | 627,922 | ​ | $ | 564,484 | ​ | $ | 666,614 | ​ | $ | 547,188 | ​ | $ | 539,038
Equity awards reported in SCT | ​ | $ | (67,934) | ​ | $ | (94,460) | ​ | $ | (134,615) | ​ | $ | (77,966) | ​ | $ | (86,260)
Pension amount reported in SCT | ​ | $ | (84,381) | ​ | $ | (53,024) | ​ | $ | (51,605) | ​ | $ | (44,699) | ​ | $ | (48,660)
Pension value attributable to current years' service | ​ | ​ | 84,381 | ​ | ​ | 49,217 | ​ | ​ | 44,768 | ​ | ​ | 35,101 | ​ | ​ | 35,892
FV of equity granted in current year | ​ | $ | 52,692 | ​ | $ | 57,675 | ​ | $ | 161,832 | ​ | $ | 65,506 | ​ | $ | 74,960
Dividends paid on unvested shares and stock options (SOs) | ​ | $ | 11,903 | ​ | $ | 9,129 | ​ | $ | 6,443 | ​ | $ | 3,517 | ​ | $ | 6,338
Change in FV Equity | ​ | $ | (7,693) | ​ | $ | (49,744) | ​ | $ | (11,869) | ​ | $ | 12,417 | ​ | $ | (58,073)
CAP | ​ | $ | 616,889 | ​ | $ | 483,277 | ​ | $ | 681,568 | ​ | $ | 541,064 | ​ | $ | 463,236
​
(3) | Based on initial investment of $100 and a cumulative Total Shareholder Return of BMRC and S&P Regional Banks Select Industry Index.
(4) | Return on Average Assets is the company selected measure.
(5) | The following non-CEO Named Executive Officers (NEOs) are included in the average figures shown:
2024: Girton, Bloom, Campbell, Stewart 2023: Girton, Campbell, Sloan, Stewart 2022: Girton, Campbell, Sloan, Stewart 2021: Girton, Campbell, Stewart, Reizman 2020: Girton, Myers, Reizman, Burke |  |  |  |
Company Selected Measure Name | Return on 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 Named Executive Officers (NEOs) are included in the average figures shown:
2024: Girton, Bloom, Campbell, Stewart 2023: Girton, Campbell, Sloan, Stewart 2022: Girton, Campbell, Sloan, Stewart 2021: Girton, Campbell, Stewart, Reizman 2020: Girton, Myers, Reizman, Burke |  |  |  |
Peer Group Issuers, Footnote |
(3) | Based on initial investment of $100 and a cumulative Total Shareholder Return of BMRC and S&P Regional Banks Select Industry Index.
Adjustment To PEO Compensation, Footnote |
(2) | Reconciliation of adjustments made to SCT to arrive at CAP for the CEO and average NEO:
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | CEO
​ |  | 2024 (Myers) |  | 2023 (Myers) |  | 2022 (Myers) |  | 2021 (Myers) |  | 2021 (Colombo) |  | 2020 (Colombo)
SCT | ​ | $ | 1,367,529 | ​ | $ | 1,129,808 | ​ | $ | 1,272,044 | ​ | $ | 809,192 | ​ | $ | 1,262,094 | ​ | $ | 1,136,968
Equity awards reported in SCT | ​ | $ | (299,273) | ​ | $ | (272,031) | ​ | $ | (294,414) | ​ | $ | (153,988) | ​ | $ | (247,290) | ​ | $ | (237,771)
Pension amount reported in SCT | ​ | $ | (89,464) | ​ | $ | (84,544) | ​ | $ | (94,763) | ​ | $ | (59,356) | ​ | $ | (97,586) | ​ | $ | (94,664)
Pension value attributable to current years' service | ​ | ​ | 89,464 | ​ | ​ | 84,544 | ​ | ​ | 82,638 | ​ | ​ | 54,174 | ​ | ​ | 0 | ​ | ​ | 0
FV of equity granted in current year | ​ | $ | 244,736 | ​ | $ | 160,698 | ​ | $ | 362,628 | ​ | $ | 124,745 | ​ | $ | 197,416 | ​ | $ | 226,175
Dividends paid on unvested shares and stock options (SOs) | ​ | $ | 45,249 | ​ | $ | 23,728 | ​ | $ | 13,643 | ​ | $ | 7,183 | ​ | $ | 13,931 | ​ | $ | 14,033
Change in FV Equity | ​ | $ | (29,809) | ​ | $ | (111,735) | ​ | $ | (17,313) | ​ | $ | 20,704 | ​ | ​ | 37,550 | ​ | ​ | (226,801)
CAP | ​ | $ | 1,328,432 | ​ | $ | 930,468 | ​ | $ | 1,324,463 | ​ | $ | 802,655 | ​ | $ | 1,166,115 | ​ | $ | 817,940
Non-PEO NEO Average Total Compensation Amount | $ 627,922 | $ 564,484 | $ 666,614 | $ 547,188 | $ 539,038
Non-PEO NEO Average Compensation Actually Paid Amount | $ 616,889 | 483,277 | 681,568 | 541,064 | 463,236
Adjustment to Non-PEO NEO Compensation Footnote |
(2) | Reconciliation of adjustments made to SCT to arrive at CAP for the CEO and average NEO:
​ ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | Average NEO
​ |  | ​ | 2024 |  | ​ | 2023 |  | 2022 |  | 2021 |  | 2020
SCT | ​ | $ | 627,922 | ​ | $ | 564,484 | ​ | $ | 666,614 | ​ | $ | 547,188 | ​ | $ | 539,038
Equity awards reported in SCT | ​ | $ | (67,934) | ​ | $ | (94,460) | ​ | $ | (134,615) | ​ | $ | (77,966) | ​ | $ | (86,260)
Pension amount reported in SCT | ​ | $ | (84,381) | ​ | $ | (53,024) | ​ | $ | (51,605) | ​ | $ | (44,699) | ​ | $ | (48,660)
Pension value attributable to current years' service | ​ | ​ | 84,381 | ​ | ​ | 49,217 | ​ | ​ | 44,768 | ​ | ​ | 35,101 | ​ | ​ | 35,892
FV of equity granted in current year | ​ | $ | 52,692 | ​ | $ | 57,675 | ​ | $ | 161,832 | ​ | $ | 65,506 | ​ | $ | 74,960
Dividends paid on unvested shares and stock options (SOs) | ​ | $ | 11,903 | ​ | $ | 9,129 | ​ | $ | 6,443 | ​ | $ | 3,517 | ​ | $ | 6,338
Change in FV Equity | ​ | $ | (7,693) | ​ | $ | (49,744) | ​ | $ | (11,869) | ​ | $ | 12,417 | ​ | $ | (58,073)
CAP | ​ | $ | 616,889 | ​ | $ | 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, 2024: Net Income (YTD Pre-tax, Pre-provision) Return on Assets (YTD) Non-Interest Expense Total Loan Growth Total Deposit Growth ​ 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 | 99.6 | 79.5 | 87.5 | 78.6
Peer Group Total Shareholder Return Amount | 100.2 | 100 | 110.5 | 129.6 | 92.7
Net Income (Loss) | $ (8,409,000) | $ 19,895,000 | $ 46,586,044 | $ 33,228,231 | $ 30,242,498
Company Selected Measure Amount | (0.22) | 0.49 | 1.08 | 0.94 | 1.04
PEO Name | Mr. Myers |  |  |  |
Measure:: 1 |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Name | Net Income (YTD Pre-tax, Pre-provision) |  |  |  |
Measure:: 2 |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Name | Return on Assets (YTD) |  |  |  |
Non-GAAP Measure Description |
(4) | Return on Average Assets is the company selected measure.
Measure:: 3 |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Name | Non-Interest Expense |  |  |  |
Measure:: 4 |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Name | Total Loan Growth |  |  |  |
Measure:: 5 |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Name | Total Deposit Growth |  |  |  |
Myers |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
PEO Total Compensation Amount | $ 1,367,529 | $ 1,129,808 | $ 1,272,044 | $ 809,192 |
PEO Actually Paid Compensation Amount | 1,328,432 | 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 | Pension Adjustments Service Cost |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | 89,464 | 84,544 | 82,638 | 54,174 |
PEO | Myers | Pension Adjustments Prior Service Cost |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | (89,464) | (84,544) | (94,763) | (59,356) |
PEO | Myers | Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | (299,273) | (272,031) | (294,414) | (153,988) |
PEO | Myers | Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | 244,736 | 160,698 | 362,628 | 124,745 |
PEO | Myers | Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | (29,809) | (111,735) | (17,313) | 20,704 |
PEO | Myers | Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | 45,249 | 23,728 | 13,643 | 7,183 |
PEO | Colombo | Pension Adjustments Service Cost |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount |  |  |  | 0 | 0
PEO | Colombo | Pension Adjustments Prior Service Cost |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount |  |  |  | (97,586) | (94,664)
PEO | Colombo | Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount |  |  |  | (247,290) | (237,771)
PEO | Colombo | Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount |  |  |  | 197,416 | 226,175
PEO | Colombo | Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount |  |  |  | 37,550 | (226,801)
PEO | Colombo | Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount |  |  |  | 13,931 | 14,033
Non-PEO NEO | Pension Adjustments Service Cost |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | 84,381 | 49,217 | 44,768 | 35,101 | 35,892
Non-PEO NEO | Pension Adjustments Prior Service Cost |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | (84,381) | (53,024) | (51,605) | (44,699) | (48,660)
Non-PEO NEO | Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | (67,934) | (94,460) | (134,615) | (77,966) | (86,260)
Non-PEO NEO | Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | 52,692 | 57,675 | 161,832 | 65,506 | 74,960
Non-PEO NEO | Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | (7,693) | (49,744) | (11,869) | 12,417 | (58,073)
Non-PEO NEO | Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year |  |  |  |  |
Pay vs Performance Disclosure |  |  |  |  |
Adjustment to Compensation, Amount | $ 11,903 | $ 9,129 | $ 6,443 | $ 3,517 | $ 6,338

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