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Merger - Schedule of Merger-Related One-Time and Conversion Costs (Details) - Bank of Marin - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total merger-related one-time and conversion costs | $ 5,142 | $ 0 | $ 5,359 | $ 0
Personnel and severance |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total merger-related one-time and conversion costs | 2,668 | 0 | 2,668 | 0
Professional services |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total merger-related one-time and conversion costs | 1,778 | 0 | 1,979 | 0
Data processing |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total merger-related one-time and conversion costs | 433 | 0 | 433 | 0
Other expense |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Total merger-related one-time and conversion costs | $ 263 | $ 0 | $ 279 | $ 0

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- Definition The amount of cash paid during the reporting period for charges associated with the mergers. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3536-108585 + Details
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