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Condensed Bank of Marin Bancorp Parent Only Financial Statements - Balance Sheet (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Other assets | $ 72,620 | $ 68,961 |  |
Total assets | 2,468,154 | 2,023,493 |  |
Subordinated debentures | 5,739 | 5,586 |  |
Other liabilities | 16,720 | 14,644 |  |
Total liabilities | 2,171,129 | 1,792,930 |  |
Stockholders' equity | 297,025 | 230,563 | $ 214,473 | $ 200,026
Total liabilities and stockholders' equity | 2,468,154 | 2,023,493 |  |
Bancorp |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Cash and due from Bank of Marin | 3,246 | 3,568 |  |
Investment in bank subsidiary | 299,486 | 232,431 |  |
Other assets | 586 | 670 |  |
Total assets | 303,318 | 236,669 |  |
Subordinated debentures | 5,739 | 5,586 |  |
Accrued expenses payable | 146 | 96 |  |
Other liabilities | 408 | 424 |  |
Total liabilities | 6,293 | 6,106 |  |
Stockholders' equity | 297,025 | 230,563 |  |
Total liabilities and stockholders' equity | $ 303,318 | $ 236,669 |  |

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