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Business Combinations - Fair Value Table (Details) - USD ($)
$ in Thousands
Nov. 30, 2023
Sep. 30, 2024
Dec. 31, 2023
Asset Acquisition [Line Items]      
Cash and due from banks   $ 251,869 $ 202,427
Loans held for sale   28,639 122,757
Loans and leases, net [1]   23,273,432 25,208,000
Premises and equipment, net   143,200 146,798
Other assets   964,054 1,131,249
Assets   33,432,613 38,534,064
Deposits   $ 26,828,269 $ 30,401,769
Long-term debt - Asset Acquistion $ 257,600    
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net 446,234    
Goodwill, Transfers 216,770    
Pacific Western Bank      
Asset Acquisition [Line Items]      
Business Combination, Consideration Transferred 663,004    
Cash and due from banks 335,300    
Debt Securities AFS - Asset Acquistion 872,800    
Loans held for sale 2,179,860    
Loans and leases, net 3,952,073    
Premises and equipment, net 103,500    
Other Intangible Assets, Net 145,500    
Current and Deferred Tax Assets, net 209,602    
Other assets 391,050    
Assets 8,189,685    
Deposits 6,547,659    
Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances 794,000    
Other Liabilities 144,192    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities $ 7,743,451    
[1] Excludes accrued interest receivable of $99.0 million and $111.3 million at September 30, 2024 and December 31, 2023, respectively, which is recorded in "Other assets" on the condensed consolidated balance sheets.