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Merger - Narrative (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2021
USD ($)
Aug. 06, 2021
USD ($)
shares
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Business Combination, Separately Recognized Transactions [Line Items]          
Goodwill $ 72,754   $ 72,754 $ 30,140  
Core deposit intangible 6,605   6,605 3,831  
Amortization of core deposit intangible     $ 1,135 $ 853 $ 887
American River Bank (ARB) Merger          
Business Combination, Separately Recognized Transactions [Line Items]          
Goodwill   $ 42,614      
American River Bank (ARB) Merger | Common Stock          
Business Combination, Separately Recognized Transactions [Line Items]          
Fixed exchange ratio   0.575      
American River Bank (ARB) Merger | Core deposit intangible          
Business Combination, Separately Recognized Transactions [Line Items]          
Core deposits, amortization period     10 years    
Core deposit intangible   $ 3,900      
Amortization of core deposit intangible $ 318        
American River Bank (ARB) Merger | Bank of Marin          
Business Combination, Separately Recognized Transactions [Line Items]          
Business combination, number of common stock issued (in shares) | shares   3,441,235