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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, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Condensed Financial Statements, Captions [Line Items] |  |  |
Interest expense | $ 2,269 | $ 2,251 | $ 2,349
Non-interest expense | 47,692 | 46,949 | 47,263
Income tax benefit | (13,346) | (10,490) | (11,698)
Net income | 23,134 | 18,441 | 19,771
Bancorp |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Dividends from bank subsidiary | 6,400 | 6,500 | 0
Miscellaneous Income | 7 | 6 | 8
Total income | 6,407 | 6,506 | 8
Interest expense | 435 | 420 | 421
Non-interest expense | 984 | 973 | 851
Total expense | 1,419 | 1,393 | 1,272
Income (loss) before income taxes and equity in undistributed net income of subsidiary | 4,988 | 5,113 | (1,264)
Income tax benefit | 594 | 583 | 532
Income (loss) before equity in undistributed net income of subsidiary | 5,582 | 5,696 | (732)
Earnings of bank subsidiary greater (less) than dividends received from bank subsidiary | 17,552 | 12,745 | 20,503
Net income | $ 23,134 | $ 18,441 | $ 19,771

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