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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, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Condensed Financial Statements, Captions [Line Items] |  |  |
Net income | $ 23,134 | $ 18,441 | $ 19,771
Accretion of discount on subordinated debentures | 191 | 210 | 216
Other assets | 257 | 1,081 | (184)
Other liabilities | (110) | 1,355 | (2,430)
Net cash provided by operating activities | 25,446 | 23,682 | 18,857
Net cash used in investing activities | 24,318 | (263,278) | (42,652)
Dividends paid on common stock | (6,223) | (5,390) | (4,733)
Net cash (used in) provided by financing activities | (27,303) | 224,572 | (38,611)
Net (decrease) increase in cash and cash equivalents | 22,461 | (15,024) | (62,406)
Stock issued in payment of director fees | 234 | 275 | 236
Bancorp |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Net income | 23,134 | 18,441 | 19,771
Earnings of bank subsidiary greater than dividends received from bank subsidiary | (17,552) | (12,745) | (20,503)
Accretion of discount on subordinated debentures | 191 | 210 | 216
Other assets | 353 | (298) | (88)
Intercompany receivable | 171 | (18) | 0
Other liabilities | (302) | 368 | (99)
Net cash provided by operating activities | 5,995 | 5,958 | (703)
Capital contribution to subsidiary | (1,285) | (1,156) | (1,475)
Net cash used in investing activities | (1,285) | (1,156) | (1,475)
Stock options exercised and stock purchases | 1,285 | 1,156 | 1,475
Dividends paid on common stock | (6,223) | (5,390) | (4,733)
Net cash (used in) provided by financing activities | (4,938) | (4,234) | (3,258)
Net (decrease) increase in cash and cash equivalents | (228) | 568 | (5,436)
Cash and cash equivalents at beginning of period | 3,796 | 3,228 | 8,664
Cash and cash equivalents at end of period | 3,568 | 3,796 | 3,228
Stock issued in payment of director fees | $ 234 | $ 275 | $ 236

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