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Dividend Availability and Regulatory Matters Dividend Availability and Regulatory Matters (Details) - USD ($)
Dec. 31, 2024
Dec. 31, 2023
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%