Regulatory Matters - Schedule of Compliance with Regulatory Capital Requirements (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total capital (to risk weighted assets), Actual Amount	$ 282,477	$ 278,444
Total capital (to risk weighted assets), Actual Ratio	12.67%	12.69%
Tier 1 capital (to risk weighted assets), Actual Amount	$ 225,297	$ 221,346
Tier 1 capital (to risk weighted assets), Actual Ratio	10.11%	10.08%
Common Equity Tier 1 (to risk weighted assets),Actual Amount	$ 212,061	$ 208,873
Common Equity Tier 1 (to risk weighted assets),Actual Ratio	9.51%	9.52%
Tier 1 capital (to leverage assets), Actual Amount	$ 225,297	$ 221,346
Tier 1 capital (to leverage assets), Actual Ratio	8.99%	9.01%
Pacific Continental Bank [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Total capital (to risk weighted assets), Actual Amount	$ 274,050	$ 267,416
Total capital (to risk weighted assets), Actual Ratio	12.30%	12.19%
Tier 1 capital (to risk weighted assets), Actual Amount	$ 250,990	$ 244,414
Tier 1 capital (to risk weighted assets), Actual Ratio	11.26%	11.14%
Common Equity Tier 1 (to risk weighted assets),Actual Amount	$ 250,990	$ 244,414
Common Equity Tier 1 (to risk weighted assets),Actual Ratio	11.26%	11.14%
Tier 1 capital (to leverage assets), Actual Amount	$ 250,990	$ 244,414
Tier 1 capital (to leverage assets), Actual Ratio	10.01%	9.96%
Total capital (to risk weighted assets), For Capital Adequacy Purposes Amount	$ 178,316	$ 175,555
Tier 1 capital (to risk weighted assets), For Capital Adequacy Purposes Amount	133,737	131,666
Common Equity Tier 1 (to risk weighted assets), For Capital Adequacy Purposes Amount	100,303	98,750
Tier 1 capital (to leverage assets), For Capital Adequacy Purposes Amount	$ 100,266	$ 98,181
Total capital (to risk weighted assets), For Capital Adequacy Purposes Ratio	8.00%	8.00%
Tier 1 capital (to risk weighted assets), For Capital Adequacy Purposes Ratio	6.00%	6.00%
Common Equity Tier 1 (to risk weighted assets), For Capital Adequacy Purposes Ratio	4.50%	4.50%
Tier 1 capital (to leverage assets), For Capital Adequacy Purposes Ratio	4.00%	4.00%
Total capital (to risk weighted assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 222,895	$ 219,444
Tier 1 capital (to risk weighted assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	178,316	175,555
Common Equity Tier 1 (to risk weighted assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	144,882	142,638
Tier 1 capital (to leverage assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount	$ 111,448	$ 122,726
Total capital (to risk weighted assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	10.00%	10.00%
Tier 1 capital (to risk weighted assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	8.00%	8.00%
Common Equity Tier 1 (to risk weighted assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	6.50%	6.50%
Tier 1 capital (to leverage assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio	5.00%	5.00%

PACIFIC CONTINENTAL CORP 10-Q