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Short-term Borrowings (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2023
Dec. 31, 2022
Short-term Borrowings Disclosure [Abstract]    
Lines of credit committed $ 1,600,000 $ 1,500,000
Average federal funds interest rate 5.25%  
Interest rate 5.25%  
Loans held for investment $ 3,420,611 3,445,476
Fed account borrowing capacity 655,000  
Advances from FHLB 0 $ 0
Federal Reserve Bank [Member]    
Short-term Borrowings Disclosure [Abstract]    
Lines of credit committed 655,000  
Asset Pledged as Collateral [Member] | Federal Reserve Bank [Member]    
Short-term Borrowings Disclosure [Abstract]    
Loans held for investment 894,400  
FHLB of San Francisco [Member]    
Short-term Borrowings Disclosure [Abstract]    
Lines of credit committed 784,100  
Debt instrument, collateral amount $ 1,300,000  
Interest rate 5.35%