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Merger - Schedule of Merger-Related One-Time and Conversion Costs (Details) - Bank of Marin - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Restructuring Cost and Reserve [Line Items]      
Total merger-related and conversion costs $ 858 $ 6,458 $ 0
Personnel and severance      
Restructuring Cost and Reserve [Line Items]      
Total merger-related and conversion costs 393 3,005 0
Professional services      
Restructuring Cost and Reserve [Line Items]      
Total merger-related and conversion costs 67 1,976 0
Data processing      
Restructuring Cost and Reserve [Line Items]      
Total merger-related and conversion costs 77 1,127 0
Other expense      
Restructuring Cost and Reserve [Line Items]      
Total merger-related and conversion costs $ 321 $ 350 $ 0