Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
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Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
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Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 470
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Borrowings and Other Obligations - Borrowings Narrative (Details) - USD ($)	Jun. 30, 2026	Dec. 31, 2025	Nov. 19, 2025
Subordinated Notes \| 2035 Notes
Line of Credit Facility [Line Items]
Principal amount			$ 45,000,000.0
Fixed interest rate			6.75%
Federal Reserve Bank of San Francisco \| Line of credit \| Federal Reserve Bank Term Funding Program
Line of Credit Facility [Line Items]
Lines of credit	$ 310,400,000	$ 344,700,000
FHLB short-term borrowings \| Line of credit
Line of Credit Facility [Line Items]
Lines of credit	978,400,000	967,200,000
FRBSF advances - Discount Window \| Line of credit \| Unsecured debt
Line of Credit Facility [Line Items]
Lines of credit	$ 140,000,000.0	$ 140,000,000.0