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Borrowings - Additional Information (Detail) - USD ($) |  | 12 Months Ended |
--- | --- | --- | ---
Jan. 31, 2006 | Dec. 31, 2022 | Dec. 31, 2021
Debt Instrument [Line Items] |  |  |
Funds borrowed under repurchase agreement |  | $ 565,431,000 | $ 642,388,000
Weighted average interest rates |  | 0.11% | 0.08%
Loans Pledged As Collaterals |  | $ 4,300,000,000 |
Investment securities at carrying value |  | $ 2,900,000,000 | $ 2,180,000,000
Borrowing Rate |  | 4.65% |
Period of LIBOR | 1 year |  |
Short term borrowings |  | $ 995,000,000.0 | $ 2,300,000
Collateral Pledged [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Investment securities at carrying value |  | $ 2,900,000,000 |
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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