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Merger - Narrative (Details) - USD ($)
3 Months Ended
Aug. 06, 2021
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Business Combination, Separately Recognized Transactions [Line Items]        
Goodwill   $ 72,754,000 $ 72,754,000  
Core deposit intangible, net   6,225,000 6,605,000  
Amortization of core deposit intangible   380,000 $ 393,000 $ 204,000
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   $ 184,000   $ 0
Intangible useful life   10 years    
Impairment loss intangible assets   $ 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