Dividend Availability and Regulatory Matters Dividend Availability and Regulatory Matters (Details Textual) $ in Thousands		12 Months Ended			36 Months Ended
	Apr. 30, 2021 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2020 USD ($)
Compliance with Regulatory Capital Requirements for Mortgage Companies [Line Items]
Proceeds from Dividends Received		$ 129,000
Retained earnings		1,420,624	$ 1,016,350
Capital Required to be Well Capitalized to Risk Weighted Assets			0.1000
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets			0.0800
Tier One Risk Based Capital Required to be Well Capitalized			6.50%
Tier One Leverage Capital Required to be Well Capitalized to Average Assets			0.0500
Subordinated debt		867,100
Tier One Capital, Trust Preferred Securities Capital Portion		131,000
Tier Two Capital, Trust Preferred Securities Capital Portion		721,900
Net earnings (loss)		423,613	$ 606,959	$ (1,237,574)
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]
Retained earnings		$ 790,900
Capital Required to be Well Capitalized to Risk Weighted Assets			0.1000
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets			0.0800
Tier One Risk Based Capital Required to be Well Capitalized			6.50%
Tier One Leverage Capital Required to be Well Capitalized to Average Assets			0.0500
Net earnings (loss)					$ (195,400)
Payments of Ordinary Dividends					$ 569,000