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Borrowings - Additional Information (Detail) - USD ($)		12 Months Ended
	Jan. 31, 2006	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2006
Debt Instrument [Line Items]
Funds borrowed under repurchase agreement		$ 428,659,000	$ 442,255,000
Weighted average interest rates		0.44%	0.39%
Loans at carrying value		$ 6,030,000,000.00	$ 5,710,000,000
Investment securities at carrying value		1,640,000,000	1,660,000,000
Overnight borrowings			$ 280,000,000.0
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		$ 1,640,000,000
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

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