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Merger - Narrative (Details)
$ in Thousands
Aug. 06, 2021
USD ($)
shares
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Business Combination, Separately Recognized Transactions [Line Items]      
Goodwill   $ 72,754 $ 72,754
American River Bank (ARB) Merger      
Business Combination, Separately Recognized Transactions [Line Items]      
Assets $ 898,400    
Investment securities acquired 297,800    
Loans 419,400    
Liabilities 816,600    
Deposits 790,000    
Goodwill 42,600    
Total merger consideration 124,477    
Net assets acquired $ 81,900    
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    
American River Bank (ARB) Merger | Common Stock      
Business Combination, Separately Recognized Transactions [Line Items]      
Fixed exchange ratio 0.575