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Condensed Bank of Marin Bancorp Parent Only Financial Statements - Cash Flow 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] |  |  |
Net income | $ 15,976 | $ 23,134 | $ 18,441
Accretion of discount on subordinated debentures | 153 | 191 | 210
Other assets | (278) | 581 | 347
Other liabilities | 1,035 | (324) | 1,142
Noncash director compensation expense-common stock | 197 | 180 | 274
Net cash provided by operating activities | 26,947 | 25,446 | 23,682
Net cash used in investing activities | 7,813 | 24,318 | (263,278)
Payment of tax withholding for stock options exercised | (60) | 0 | 0
Dividends paid on common stock | (6,896) | (6,223) | (5,390)
Net cash provided by (used in) financing activities | 119,981 | (27,303) | 224,572
Net (decrease) increase in cash and cash equivalents | 154,741 | 22,461 | (15,024)
Stock issued in payment of director fees | 188 | 234 | 275
Bancorp |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Net income | 15,976 | 23,134 | 18,441
Earnings of bank subsidiary greater than dividends received from bank subsidiary | (9,618) | (17,552) | (12,745)
Accretion of discount on subordinated debentures | 153 | 191 | 210
Other assets | 92 | 353 | (298)
Intercompany receivable | (40) | 171 | (18)
Other liabilities | 51 | (302) | 368
Noncash director compensation expense-common stock | 20 | 0 | 0
Net cash provided by operating activities | 6,634 | 5,995 | 5,958
Capital contribution to subsidiary | (853) | (1,285) | (1,156)
Net cash used in investing activities | (853) | (1,285) | (1,156)
Proceeds from stock options exercised and stock issued under employee and director stock purchase plans and ESOP | 853 | 1,285 | 1,156
Payment of tax withholding for stock options exercised | (60) | 0 | 0
Dividends paid on common stock | (6,896) | (6,223) | (5,390)
Net cash provided by (used in) financing activities | (6,103) | (4,938) | (4,234)
Net (decrease) increase in cash and cash equivalents | (322) | (228) | 568
Cash and cash equivalents at beginning of period | 3,568 | 3,796 | 3,228
Cash and cash equivalents at end of period | 3,246 | 3,568 | 3,796
Stock issued in payment of director fees | $ 188 | $ 234 | $ 275

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