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Merger - Schedule of Merger-Related One-Time and Conversion Costs (Details) - Bank of Marin - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Restructuring Cost and Reserve [Line Items] |  |  |
Total merger-related and conversion costs | $ 0 | $ 858 | $ 6,458
Personnel and severance |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total merger-related and conversion costs | 0 | 393 | 3,005
Professional services |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total merger-related and conversion costs | 0 | 67 | 1,976
Data processing |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total merger-related and conversion costs | 0 | 77 | 1,127
Other expense |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total merger-related and conversion costs | $ 0 | $ 321 | $ 350

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