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Condensed Bank of Marin Bancorp Parent Only Financial Statements - Income Statement (Details) - USD ($)
$ in Thousands
 12 Months Ended
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