Dividend Availability and Regulatory Matters Dividend Availability and Regulatory Matters (Details Textual) - USD ($) $ in Thousands		12 Months Ended			36 Months Ended
	Apr. 30, 2021	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2024
Compliance with Regulatory Capital Requirements for Mortgage Companies [Line Items]
Net earnings (loss)		$ 126,888	$ (1,899,137)	$ 423,613
Proceeds from Dividends Received		80,000
Retained deficit		$ (431,201)	(518,301)		$ (431,201)
Capital Required for Capital Adequacy to Risk Weighted Assets		8.00%			8.00%
Banking Regulation, Tier 1 Risk-Based Capital Ratio, Capital Adequacy, Minimum		6.00%			6.00%
Banking Regulation, Common Equity Tier 1 Risk-Based Capital Ratio, Capital Adequacy, Minimum		4.50%			4.50%
Tier One Leverage Capital Required for Capital Adequacy to Average Assets		4.00%			4.00%
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		8.00%			8.00%
Banking Regulation, Common Equity Tier 1 Risk-Based Capital Ratio, Well Capitalized, Minimum		6.50%			6.50%
Tier One Leverage Capital Required to be Well Capitalized to Average Assets		5.00%			5.00%
Tier One Capital, Trust Preferred Securities Capital Portion		$ 131,000			$ 131,000
Tier Two Capital, Trust Preferred Securities Capital Portion		796,000			796,000
Deferred tax asset, net		720,587	$ 739,111		720,587
April 30, 2021 Issuance
Compliance with Regulatory Capital Requirements for Mortgage Companies [Line Items]
Subordinated debt	$ 400,000
Subordinated Borrowing, Interest Rate	3.25%
Pacific Western Bank
Compliance with Regulatory Capital Requirements for Mortgage Companies [Line Items]
Net earnings (loss)					(1,200,000)
Payments of Ordinary Dividends					255,000
Retained deficit		$ (3,000,000)			$ (3,000,000)
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%
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%
Banking Regulation, Capital Conservation Buffer, Common Equity Tier 1 Risk-Based Capital, Actual			7.00%
Banking Regulation, Capital Conservation Buffer, Tier 1 Risk-Based Capital, Actual			8.50%
Banking Regulation, Capital Conservation Buffer, Total Risk-Based Capital, Actual			10.50%
Common Equity Tier One Capital Ratio		10.55%	10.14%		10.55%
Deferred tax asset, net		$ 307,600			$ 307,600
Banc of California
Compliance with Regulatory Capital Requirements for Mortgage Companies [Line Items]
Deferred tax asset, net		$ 293,500			$ 293,500