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Merger - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended
Aug. 06, 2021
Sep. 30, 2022
Jun. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Business Combination, Separately Recognized Transactions [Line Items]              
Goodwill   $ 72,754,000     $ 72,754,000   $ 72,754,000
Core deposit intangible, net   5,481,000     5,481,000   $ 6,605,000
Amortization of core deposit intangible   370,000 $ 374,000 $ 334,000 1,124,000 $ 742,000  
American River Bank (ARB) Merger              
Business Combination, Separately Recognized Transactions [Line Items]              
Investment securities $ 297,800,000            
Loans 419,400,000            
Deposits 790,000,000            
Goodwill 42,600,000            
American River Bank (ARB) Merger | Core Deposits              
Business Combination, Separately Recognized Transactions [Line Items]              
Core deposit intangible, net $ 3,900,000            
Amortization of core deposit intangible   $ 174,000   $ 129,000 $ 537,000 129,000  
Intangible useful life         10 years    
Impairment loss intangible assets         $ 0 $ 0  
American River Bank (ARB) Merger | Bank of Marin              
Business Combination, Separately Recognized Transactions [Line Items]              
Merger agreement, shares exchange ratio (in shares) 0.575            
Business combination, number of common stock issued (in shares) 3,441,235