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Condensed Bank of Marin Bancorp Parent Only Financial Statements - Condensed Unconsolidated Statements of Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items]    
Interest expense $ 3,536 $ 1,744
Non-interest expense 58,266 53,782
Income tax benefit (10,795) (12,862)
Net income 32,622 15,976
Bancorp    
Condensed Financial Statements, Captions [Line Items]    
Dividends from bank subsidiary 36,700 8,000
Miscellaneous Income 9 8
Total income 36,709 8,008
Interest expense 1,339 439
Non-interest expense 1,275 2,087
Total expense 2,614 2,526
Income before income taxes and equity in undistributed net income of subsidiary 34,095 5,482
Income tax benefit 770 876
Income before equity in undistributed net income of subsidiary 34,865 6,358
Earnings of bank subsidiary (less) greater than dividends received from bank subsidiary (2,243) 9,618
Net income $ 32,622 $ 15,976