Purchase Price Consideration (Details) - USD ($) $ in Thousands			12 Months Ended
		Nov. 30, 2023	Dec. 31, 2023	Dec. 31, 2024
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Cash and due from banks			$ 202,427	$ 192,006
Loans held for sale			122,757	26,331
Loans and leases, net	[1]		25,208,000	23,542,303
Premises and equipment, net			146,798	142,546
Other assets			1,131,249	913,954
Deposits			30,401,769	27,191,909
Long-Term Debt			2,911,322	1,391,814
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net		$ 464,377
Goodwill, Transfers		198,627	198,627
(amortized cost of $2,526,644 and $2,699,255, respectively)			$ 2,346,864	$ 2,246,839
Pacific Western Bank
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Business Combination, Consideration Transferred		663,004
Cash and due from banks		335,300
Loans held for sale		2,182,988
Loans and leases, net		3,965,112
Premises and equipment, net		103,500
Other Intangible Assets, Net		145,500
Current and Deferred Tax Assets, net		209,100
Other assets		392,550
Total Assets Acquired		8,206,850
Deposits		6,547,659
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances		794,000
Long-Term Debt		257,600
Other Liabilities		143,214
Liabilities Assumed		7,742,473
(amortized cost of $2,526,644 and $2,699,255, respectively)		$ 872,800

[1] Excludes accrued interest receivable of $96.8 million and $111.3 million at December 31, 2024 and 2023, which is recorded in "Other assets" on the consolidated balance sheets.