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Borrowings - Additional Information (Detail) - USD ($) |  | 12 Months Ended |
--- | --- | --- | ---
Jan. 31, 2006 | Dec. 31, 2020 | Dec. 31, 2006 | Dec. 31, 2019
Debt Instrument [Line Items] |  |  |  |
Funds borrowed under repurchase agreement |  | $ 439,406,000 |  | $ 428,659,000
Weighted average interest rates |  | 0.10% |  | 0.44%
Loans at carrying value |  | $ 6,070,000,000.00 |  | $ 6,030,000,000.00
Investment securities at carrying value |  | 1,810,000,000 |  | 1,640,000,000
Period of LIBOR | 1 year |  |  |
Short term borrowings |  | 5,000,000.0 |  | $ 0
Collateral Pledged [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Investment securities at carrying value |  | $ 1,810,000,000 |  |
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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