Parent Company Financial Information - Schedule of Parent Company Statements of Cash Flow (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Cash flows from operating activities:
Net income	$ 12,653	$ 5,341	$ 5,092
Adjustments to reconcile net income to net cash provided by operating activities:
Excess tax benefit of stock options exercised	10	14	11
Net cash provided by operating activities	30,701	28,038	28,359
Cash flows from investing activities:
Net cash provided by investing activities	(107,344)	(85,226)	(24,033)
Cash flows from financing activities:
Proceeds from stock options exercised	69	89	104
Repurchase of Common stock	(5,676)
Dividends paid	(5,588)	(1,842)	(736)
Vested RSUs surrendered to cover tax consequences	(105)
Net cash provided by (used in) financing activities	85,485	51,356	4,395
Net increase (decrease) in cash and cash equivalents	8,842	(5,832)	8,721
Cash and cash equivalents, beginning of year	19,859	25,691	16,970
Cash and cash equivalents, end of year	28,701	19,859	25,691
Pacific Continental Corporation [Member]
Cash flows from operating activities:
Net income	12,653	5,341	5,092
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in undistributed (earnings) from the Bank	(6,259)	(5,607)	(5,609)
Excess tax benefit of stock options exercised	(10)	(14)	(11)
Other, net	28	(197)	(95)
Net cash provided by operating activities	6,412	(477)	(623)
Cash flows from investing activities:
Investment in bank subsidiary
Net cash provided by investing activities
Cash flows from financing activities:
Proceeds from stock options exercised	69	89	104
Income tax benefit for stock options exercised	10	14	11
Repurchase of Common stock	(5,676)
Proceeds from share issuance	70	56	38
Dividends paid	(5,588)	(1,842)	(736)
Vested RSUs surrendered to cover tax consequences	(105)
Net cash provided by (used in) financing activities	(11,220)	(1,683)	(583)
Net increase (decrease) in cash and cash equivalents	(4,808)	(2,160)	(1,206)
Cash and cash equivalents, beginning of year	7,273	9,433	10,639
Cash and cash equivalents, end of year	$ 2,465	$ 7,273	$ 9,433