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Acquired SJB Assets and FDIC Loss Sharing Asset - Summary of PCI Loans by Internal Risk Ratings (Detail) (PCI Loans [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total PCI gross loans	$ 121,030cvbf_GrossPurchasedCreditImpairedLoans	$ 133,496cvbf_GrossPurchasedCreditImpairedLoans
Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total PCI gross loans	25,483	26,706
Watch List [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total PCI gross loans	69,635	77,371
Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total PCI gross loans	7,148	8,203
Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total PCI gross loans	18,764	21,216
Doubtful & Loss [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total PCI gross loans	$ 0	$ 0