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Condensed Bank of Marin Bancorp Parent Only Financial Statements - Income Statement (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Condensed Financial Statements, Captions [Line Items] |  |  |
Interest expense | $ 1,744 | $ 2,269 | $ 2,251
Non-interest expense | 53,782 | 47,692 | 46,949
Income tax benefit | (12,862) | (13,346) | (10,490)
Net income | 15,976 | 23,134 | 18,441
Bancorp |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Dividends from bank subsidiary | 8,000 | 6,400 | 6,500
Miscellaneous Income | 8 | 7 | 6
Total income | 8,008 | 6,407 | 6,506
Interest expense | 439 | 435 | 420
Non-interest expense | 2,087 | 984 | 973
Total expense | 2,526 | 1,419 | 1,393
Income (loss) before income taxes and equity in undistributed net income of subsidiary | 5,482 | 4,988 | 5,113
Income tax benefit | 876 | 594 | 583
Income (loss) before equity in undistributed net income of subsidiary | 6,358 | 5,582 | 5,696
Earnings of bank subsidiary greater (less) than dividends received from bank subsidiary | 9,618 | 17,552 | 12,745
Net income | $ 15,976 | $ 23,134 | $ 18,441

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