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Short-term Borrowings (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Short-term Borrowings Disclosure [Abstract]    
Lines of credit committed $ 1,500,000 $ 1,400,000
Average federal funds interest rate 4.50%  
Interest rate 4.25%  
Loans held for investment $ 3,445,476 3,176,170
Fed account borrowing capacity 651,000  
Advances from FHLB 0 $ 0
Federal Reserve Bank [Member]    
Short-term Borrowings Disclosure [Abstract]    
Lines of credit committed 651,000  
Asset Pledged as Collateral [Member] | Federal Reserve Bank [Member]    
Short-term Borrowings Disclosure [Abstract]    
Loans held for investment 883,800  
FHLB of San Francisco [Member]    
Short-term Borrowings Disclosure [Abstract]    
Lines of credit committed 757,900  
Debt instrument, collateral amount $ 1,200,000  
Interest rate 4.63%