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Deposits (Details)
 12 Months Ended
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Oct. 01, 2024
USD ($)
Mar. 28, 2024
branch
Deposits Disclosure [Line Items]          
Total deposits $ 14,327,489,000 $ 14,753,753,000      
Decrease in deposits $ 426,300,000        
Decrease in percentage of deposit liabilities 2.90%        
Entity number of Branches | branch         2
Transfer of deposits       $ 128,100,000  
Time Deposits, $250,000 or More $ 2,706,348,000 2,240,000,000      
Brokered deposits 1,060,000,000.00 1,540,000,000      
Time deposits 5,773,804,000 5,966,757,000      
Time Deposit Maturities, Year One 5,602,477,000        
Time Deposit Maturities, Year Two 132,598,000        
Time Deposit Maturities, Year Three 1,014,000        
Time Deposit Maturities, Year Four 19,064,000        
Time Deposit Maturities, Year Five 1,189,000        
Time Deposit Maturities, after Year Five 17,462,000        
Contractual Maturities, Time Deposits, $250,000 or More, Three Months or Less 1,059,687,000        
Contractual Maturities, Time Deposits, $250,000 or More, Three Months Through Six Months 815,568,000        
Contractual Maturities, Time Deposits, $250,000 or More, Six Months Through Twelve Months 811,526,000        
Contractual Maturities, $250,000 or More, after 12 months 19,567,000        
Interest Expense, Money Market Deposits 168,131,000 152,893,000 $ 68,961,000    
Interest Expense, Savings Deposits 31,939,000 8,858,000 3,802,000    
Interest Expense, Time Deposits 295,378,000 279,480,000 42,076,000    
Interest Expense, Deposits 495,448,000 441,231,000 $ 114,839,000    
Deposit Liabilities Reclassified as Loans Receivable 1,100,000 2,000,000      
2028          
Deposits Disclosure [Line Items]          
Time deposits 17,300,000        
2030          
Deposits Disclosure [Line Items]          
Time deposits 17,500,000        
Money market and NOW accounts          
Deposits Disclosure [Line Items]          
Brokered deposits 527,100,000 164,100,000      
Time deposit accounts          
Deposits Disclosure [Line Items]          
Brokered deposits 536,000,000.0 1,370,000,000      
California State Treasurer          
Deposits Disclosure [Line Items]          
Time Deposits, $250,000 or More $ 300,000,000 300,000,000      
Required eligible collateral pledge on outstanding deposits, minimum percentage 110.00%        
Securities pledged as collateral $ 200,500,000 $ 218,700,000      
California State Treasurer | Letter of credit          
Deposits Disclosure [Line Items]          
Letter of credit issued as collateral $ 150,000,000