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Acquired SJB Assets and FDIC Loss Sharing Asset - Summary of Activity Related to FDIC Loss Sharing Liability (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
FDIC Indemnification Asset [Roll Forward]
Balance, beginning of period	$ (502)	$ (229)
FDIC share of recoveries, net of charge-offs	0	(5)
Cash paid to FDIC, net	519	514
Other	(124)	(782)
Balance, end of period	$ (107)	$ (502)

X

- Definition

FDIC indemnification asset and liability.

+ References

No definition available.

+ Details

Name:	cvbf_FdicIndemnificationAssetAndLiability
Namespace Prefix:	cvbf_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

FDIC indemnification asset and liability other.

+ References

No definition available.

+ Details

Name:	cvbf_FdicIndemnificationAssetAndLiabilityOther
Namespace Prefix:	cvbf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

FDIC share of recoveries, net of charge-offs.

+ References

No definition available.

+ Details

Name:	cvbf_FdicShareOfRecoveriesNetOfChargeOffs
Namespace Prefix:	cvbf_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of decreases to the indemnification asset due to cash payments received relating to loss sharing agreements with the Federal Deposit Insurance Corporation (FDIC).

+ References

No definition available.

+ Details

Name:	us-gaap_FDICIndemnificationAssetCashPaymentsReceived
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

Name:	us-gaap_FDICIndemnificationAssetRollForward
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration