Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended		2 Months Ended
	Feb. 15, 2024	Jan. 31, 2024	Nov. 30, 2023	Feb. 29, 2024	Mar. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Increase in FDIC Special Assessment [Abstract]
Pre-tax special assessment charge			$ 70,000
November 2023 Final Rule
Increase in FDIC Special Assessment [Abstract]
FDIC Deposit Insurance, Special Assessment, Estimated Loss			$ 16,300,000
Junior subordinated debt
Redemption of Junior Subordinated Debt and Trust Preferred Securities Issued by East West Capital Trusts [Abstract]
Aggregate principal amount of the junior subordinated debt						$ 148,000	$ 148,000
East West Capital Trusts | Junior subordinated debt | Forecast
Redemption of Junior Subordinated Debt and Trust Preferred Securities Issued by East West Capital Trusts [Abstract]
Junior subordinated debenture owed to unconsolidated subsidiary trust and trust preferred securities				$ 16,000	$ 101,000
Subsequent Event
Declaration of Dividend
Dividends paid per common share (in dollars per share)	$ 0.55
Increase in FDIC Special Assessment [Abstract]
FDIC Deposit Insurance, Special Assessment, Increase				4,100,000
Subsequent Event | February 2024 Update
Increase in FDIC Special Assessment [Abstract]
FDIC Deposit Insurance, Special Assessment, Estimated Loss				$ 20,400,000
Subsequent Event | East West Capital Trusts | Junior subordinated debt
Redemption of Junior Subordinated Debt and Trust Preferred Securities Issued by East West Capital Trusts [Abstract]
Aggregate principal amount of the junior subordinated debt		$ 113,000
Payments for repurchase of trust preferred securities		$ 4,000