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Borrowings - Additional Information (Detail) - USD ($)
 1 Months Ended 12 Months Ended
Jan. 31, 2006
Jan. 31, 2006
Dec. 31, 2018
Dec. 31, 2006
Dec. 31, 2017
Debt Instrument [Line Items]          
Funds borrowed under repurchase agreement     $ 442,255,000   $ 553,773,000
Weighted average interest rates     0.39%   0.30%
Loans at carrying value     $ 5,710,000,000   $ 3,680,000,000
Investment securities at carrying value     1,660,000,000   $ 1,910,000,000
Overnight borrowings     $ 280,000,000    
Overnight borrowings with cost basis points     2.53%    
Period of LIBOR   1 year      
Collateral Pledged [Member]          
Debt Instrument [Line Items]          
Investment securities at carrying value     $ 1,660,000,000    
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 $ 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