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Borrowings - Additional Information (Detail) - USD ($) |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jan. 31, 2006 | Jan. 31, 2006 | Dec. 31, 2018 | Dec. 31, 2006 | Dec. 31, 2017
Debt Instrument [Line Items] |  |  |  |  |
Funds borrowed under repurchase agreement |  |  | $ 442,255,000 |  | $ 553,773,000
Weighted average interest rates |  |  | 0.39% |  | 0.30%
Loans at carrying value |  |  | $ 5,710,000,000 |  | $ 3,680,000,000
Investment securities at carrying value |  |  | 1,660,000,000 |  | $ 1,910,000,000
Overnight borrowings |  |  | $ 280,000,000 |  |
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 |  |  | $ 1,660,000,000 |  |
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 | $ 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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