Dividend Availability and Regulatory Matters Dividend Availability and Regulatory Matters (Details Textual) - USD ($) $ in Thousands	12 Months Ended			36 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Apr. 30, 2021
Compliance with Regulatory Capital Requirements for Mortgage Companies [Line Items]
Net earnings (loss)	$ 228,973	$ 126,888	$ (1,899,137)
Proceeds from Dividends Received	430,000
Retained deficit	$ (242,016)	(431,201)		$ (431,201)
Capital Required to be Well Capitalized to Risk Weighted Assets	10.00%
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets	8.00%
Banking Regulation, Common Equity Tier 1 Risk-Based Capital Ratio, Well Capitalized, Minimum	6.50%
Tier One Leverage Capital Required to be Well Capitalized to Average Assets	5.00%
Deferred tax asset, net	$ 656,755	$ 720,587		720,587
April 30, 2021 Issuance
Compliance with Regulatory Capital Requirements for Mortgage Companies [Line Items]
Subordinated debt					$ 400,000
Pacific Western Bank
Compliance with Regulatory Capital Requirements for Mortgage Companies [Line Items]
Net earnings (loss)				(1,400,000)
Payments of Ordinary Dividends				$ 556,000
Retained deficit	$ (269,300)
Bank of California, inc.
Compliance with Regulatory Capital Requirements for Mortgage Companies [Line Items]
Capital Required to be Well Capitalized to Risk Weighted Assets		10.00%		10.00%
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets		6.00%		6.00%
Banking Regulation, Capital Conservation Buffer, Common Equity Tier 1 Risk-Based Capital, Actual		7.00%		7.00%
Banking Regulation, Capital Conservation Buffer, Tier 1 Risk-Based Capital, Actual		8.50%		8.50%
Banking Regulation, Capital Conservation Buffer, Total Risk-Based Capital, Actual		10.50%		10.50%
Common Equity Tier One Capital Ratio	10.01%	10.55%		10.55%