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Borrowings - Additional Information (Detail) - USD ($)
 12 Months Ended
Jan. 31, 2006
Dec. 31, 2022
Dec. 31, 2021
Debt Instrument [Line Items]      
Funds borrowed under repurchase agreement   $ 565,431,000 $ 642,388,000
Weighted average interest rates   0.11% 0.08%
Loans Pledged As Collaterals   $ 4,300,000,000  
Investment securities at carrying value   $ 2,900,000,000 $ 2,180,000,000
Borrowing Rate   4.65%  
Period of LIBOR 1 year    
Short term borrowings   $ 995,000,000.0 $ 2,300,000
Collateral Pledged [Member]      
Debt Instrument [Line Items]      
Investment securities at carrying value   $ 2,900,000,000  
CVB Statutory Trust III [Member] | Junior Subordinated Debenture Held by CVB Statutory Trust III [Member]      
Debt Instrument [Line Items]      
Trust preferred securities, offered fair value $ 25,000,000    
Proceeds from the offering and other cash $ 25,774,000    
Maximum Period of Deferred payments of interest   20 consecutive quarters  
Trust Preferred Securities, maturity date   Mar. 15, 2036  
Trust Preferred Securities, interest rate in excess of LIBOR 1.38%    
Trust Preferred Securities callable date   Mar. 15, 2011