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Borrowings - Additional Information (Detail) - USD ($)
 1 Months Ended 12 Months Ended
Jan. 31, 2006
Jan. 31, 2009
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2006
Feb. 23, 2015
Debt Instrument [Line Items]              
Funds borrowed under repurchase agreement     $ 553,773,000 $ 603,028,000      
Weighted average interest rates     0.30% 0.26%      
Fixed interest rate             4.52%
Loans at carrying value     $ 3,680,000,000 $ 3,110,000,000      
Investment securities at carrying value     1,910,000,000 2,190,000,000      
Prepayment penalties on borrowings     0 16,000 $ 13,900,000    
Overnight borrowings     $ 0 $ 53,000,000      
Overnight borrowings with cost basis points       0.55%      
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        
Period of LIBOR   1 year