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Nature of Business - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified			1 Months Ended		1 Months Ended
	Jun. 30, 2012	Dec. 31, 2011	Jul. 31, 2007 Pacific Mercantile Capital Trust I	Dec. 31, 2002 Pacific Mercantile Capital Trust I	Aug. 31, 2007 PMB Capital Trust I	Dec. 31, 2002 PMB Capital Trust I	Dec. 31, 2002 PMB Statutory Trust III	Oct. 31, 2004 PMB Capital Trust III
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Junior Subordinated Debentures	$ 17,527	$ 17,527		$ 5,155		$ 5,155	$ 7,217	$ 10,310
Junior Subordinated Debentures, maturity year				2032		2032	2032	2034
Redemption of junior subordinated debentures, principal amount			$ 5,155		$ 5,155

Including the current and noncurrent portions, carrying value as of the balance sheet date of long-term debt (with maturities initially due after one year or beyond the operating cycle if longer) identified as Junior Subordinated Notes, which have a lower priority than senior instruments.

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- Definition

The cash outflow associated with security instruments that either represent a creditor or an ownership relationship with the holder of the investment security with a maturity of beyond one year or normal operating cycle, if longer. Includes repayments of (a) debt, (b) capital lease obligations, (c) mandatory redeemable capital securities, and (d) any combination of (a), (b), or (c).

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