Purchase Price Consideration (Details) - USD ($) $ in Thousands			12 Months Ended
		Nov. 30, 2023	Dec. 31, 2024	Dec. 31, 2025
Business Combination, Pro Forma Information [Line Items]
Cash and due from banks			$ 192,006	$ 181,103
Loans held for sale			26,331	182,936
Loans and leases, net	[1]		23,542,303	24,787,067
Premises and equipment, net			142,546	146,698
Other assets			913,954	884,762
Deposits			27,191,909	27,843,357
Borrowings (including $113,634 and $118,838 at fair value, respectively)			1,391,814	2,063,819
Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less), and Goodwill		$ 464,377
Goodwill, Transfers		198,627	15,894
(amortized cost of $2,646,414 and $2,526,644, respectively)(ACL of $775 and $—, respectively)			$ 2,246,839	$ 2,454,058
Pacific Western Bank
Business Combination, Pro Forma Information [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, Advance, Branch of FHLBank, Amount		794,000
Borrowings (including $113,634 and $118,838 at fair value, respectively)		257,600
Other Liabilities		143,214
Liabilities Assumed		7,742,473
(amortized cost of $2,646,414 and $2,526,644, respectively)(ACL of $775 and $—, respectively)		$ 872,800

[1] Excludes accrued interest receivable of $104.3 million and $96.8 million at December 31, 2025 and 2024, which is recorded in "Other assets" on the consolidated balance sheets.