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Dividend Availability and Regulatory Matters Dividend Availability and Regulatory Matters (Details) - USD ($) | Dec. 31, 2024 | Dec. 31, 2023
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Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Tier One Leverage Capital Required to be Well Capitalized to Average Assets | 5.00% |
Banking Regulation, Common Equity Tier 1 Risk-Based Capital Ratio, Well Capitalized, Minimum | 6.50% |
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets | 8.00% |
Capital Required to be Well Capitalized to Risk Weighted Assets | 10.00% |
Bank of California, inc. |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Tier One Leverage Capital | $ 3,369,457,000 | $ 3,402,044,000
Tier One Leverage Capital to Average Assets | 10.15% | 9.00%
Tier One Leverage Capital Required to be Well Capitalized | $ 1,660,337,000 | $ 1,889,775,000
Tier One Leverage Capital Required to be Well Capitalized to Average Assets |  | 5.00%
Tier One Risk Based Common Equity | $ 2,739,941,000 | $ 2,772,528,000
Common Equity Tier One Capital Ratio | 10.55% | 10.14%
Tier One Risk Based Common Equity Required to be Well Capitalized | $ 1,688,484,000 | $ 1,777,025,000
Banking Regulation, Common Equity Tier 1 Risk-Based Capital Ratio, Well Capitalized, Minimum |  | 6.50%
Banking Regulation, Capital Conservation Buffer, Common Equity Tier 1 Risk-Based Capital, Actual |  | 7.00%
Tier One Risk Based Capital | $ 3,369,457,000 | $ 3,402,044,000
Tier One Risk Based Capital to Risk Weighted Assets | 12.97% | 12.44%
Tier One Risk Based Capital Required to be Well Capitalized | $ 2,078,134,000 | $ 2,187,108,000
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets |  | 8.00%
Banking Regulation, Capital Conservation Buffer, Tier 1 Risk-Based Capital, Actual |  | 8.50%
Capital | $ 4,427,860,000 | $ 4,490,493,000
Capital to Risk Weighted Assets | 17.05% | 16.43%
Capital Required to be Well Capitalized | $ 2,597,668,000 | $ 2,733,885,000
Capital Required to be Well Capitalized to Risk Weighted Assets |  | 10.00%
Banking Regulation, Capital Conservation Buffer, Total Risk-Based Capital, Actual |  | 10.50%
Bank of California |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Tier One Leverage Capital | $ 3,671,545,000 | $ 3,617,643,000
Tier One Leverage Capital to Average Assets | 11.08% | 9.62%
Tier One Leverage Capital Required to be Well Capitalized | $ 1,656,718,000 | $ 1,880,850,000
Tier One Leverage Capital Required to be Well Capitalized to Average Assets |  | 5.00%
Tier One Risk Based Common Equity | $ 3,671,545,000 | $ 3,617,643,000
Common Equity Tier One Capital Ratio | 14.17% | 13.27%
Tier One Risk Based Common Equity Required to be Well Capitalized | $ 1,684,283,000 | $ 1,772,549,000
Banking Regulation, Common Equity Tier 1 Risk-Based Capital Ratio, Well Capitalized, Minimum |  | 6.50%
Banking Regulation, Capital Conservation Buffer, Common Equity Tier 1 Risk-Based Capital, Actual |  | 7.00%
Tier One Risk Based Capital | $ 3,671,545,000 | $ 3,617,643,000
Tier One Risk Based Capital to Risk Weighted Assets | 14.17% | 13.27%
Tier One Risk Based Capital Required to be Well Capitalized | $ 2,072,963,000 | $ 2,181,599,000
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets |  | 8.00%
Banking Regulation, Capital Conservation Buffer, Tier 1 Risk-Based Capital, Actual |  | 8.50%
Capital | $ 4,315,098,000 | $ 4,295,821,000
Capital to Risk Weighted Assets | 16.65% | 15.75%
Capital Required to be Well Capitalized | $ 2,591,204,000 | $ 2,726,998,000
Capital Required to be Well Capitalized to Risk Weighted Assets |  | 10.00%
Banking Regulation, Capital Conservation Buffer, Total Risk-Based Capital, Actual |  | 10.50%

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