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Merger Agreement - Narrative (Details)
$ in Thousands
Apr. 16, 2021
branch
shares
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Subsequent Event [Line Items]      
Assets   $ 3,058,133 $ 2,911,926
Deposits   2,656,199 2,504,249
Loans, at amortized cost   2,121,772 $ 2,088,556
American River Bank (ARB) | American River Bank (ARB) Merger      
Subsequent Event [Line Items]      
Assets   916,100  
Deposits   788,600  
Loans, at amortized cost   $ 475,400  
Subsequent event | American River Bank (ARB) | American River Bank (ARB) Merger      
Subsequent Event [Line Items]      
Number of branches | branch 10    
Subsequent event | Bank of Marin | American River Bank (ARB) Merger      
Subsequent Event [Line Items]      
Merger agreement, shares exchange ratio (in shares) | shares 0.575