Shareholders' Equity - Regulatory Capital (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Capital conservation buffer
Capital conservation buffer (as a percent)	2.50%
Capital conservation buffer for 2016 (as a percent)	0.625%
Capital conservation buffer for 2017 (as a percent)	1.25%
Capital conservation buffer for 2018 (as a percent)	1.875%
Capital conservation buffer for 2019 (as a percent)	2.50%
Common Equity Tier I capital to risk-weighted assets:
Tier I common equity	$ 185,889
Actual Common Equity Tier I (as a percent)	12.16%
Tier I common equity required for capital adequacy	$ 78,366
Regulatory standard to be adequately capitalized (as a percent)	5.125%
2019 Minimum Common Equity Tier I Capital Ratio (as a percent)	7.00%
Phased-out rate of certain deferred tax assets and intangible assets	60.00%	40.00%
Tier I capital to average assets
Tier One Leverage Capital	$ 194,401	$ 182,234
Actual Leverage ratio (as a percent)	9.88%	9.90%
Tier One Leverage Capital Required for Capital Adequacy	$ 78,705	$ 73,664
Regulatory standard to be adequately capitalized (as a percent)	4.00%	4.00%
2019 Minimum Leverage Ratio (as a percent)	6.50%
Tier I Risk-Based Capital
Actual, Capital Amount	$ 194,401	$ 182,234
Actual Tier I capital (as a percent)	12.71%	13.01%
Tier One Risk Based Capital Required for Capital Adequacy	$ 101,303	$ 84,072
Regulatory standard to be adequately capitalized (as a percent)	6.625%	6.00%
2019 Minimum Tier I Risk-based Capital Ratio (as a percent)	8.50%
Total Risk-Based Capital Ratio
Capital	$ 212,148	$ 199,810
Actual total risk based capital (as a percent)	13.87%	14.26%
Capital Required for Capital Adequacy	$ 131,885	$ 112,096
Regulatory standard to be adequately capitalized (as a percent)	8.625%	8.00%
2019 Minimum Total Risk-based Capital Ratio	10.50%
Minimum
Common Equity Tier I capital to risk-weighted assets:
CET I to risk-weighted assets	4.50%
Total Risk-Based Capital Ratio
Regulatory standard to be well capitalized (as a percent)	6.50%
Heritage Oaks Bank
Common Equity Tier I capital to risk-weighted assets:
Tier I common equity	$ 186,239
Actual Common Equity Tier I (as a percent)	12.19%
Tier I common equity required for capital adequacy	$ 78,318
Regulatory standard to be adequately capitalized (as a percent)	5.125%
Tier I common equity required to be well capitalized	$ 99,330
Regulatory standard to be well capitalized (as a percent)	6.50%
Tier I capital to average assets
Tier One Leverage Capital	$ 186,239	$ 174,667
Actual Leverage ratio (as a percent)	9.47%	9.50%
Tier One Leverage Capital Required for Capital Adequacy	$ 78,636	$ 73,581
Regulatory standard to be adequately capitalized (as a percent)	4.00%	4.00%
Tier One Leverage Capital Required to be Well Capitalized	$ 98,296	$ 91,976
Regulatory standard to be well capitalized (as a percent)	5.00%	5.00%
Tier I Risk-Based Capital
Actual, Capital Amount	$ 186,239	$ 174,667
Actual Tier I capital (as a percent)	12.19%	12.48%
Tier One Risk Based Capital Required for Capital Adequacy	$ 101,240	$ 83,963
Regulatory standard to be adequately capitalized (as a percent)	6.625%	6.00%
Tier One Risk Based Capital Required to be Well Capitalized	$ 122,252	$ 111,951
Regulatory standard to be well capitalized (as a percent)	8.00%	8.00%
Total Risk-Based Capital Ratio
Capital	$ 203,986	$ 192,221
Actual total risk based capital (as a percent)	13.35%	13.74%
Capital Required for Capital Adequacy	$ 131,803	$ 111,951
Regulatory standard to be adequately capitalized (as a percent)	8.625%	8.00%
Capital Required to be Well Capitalized	$ 152,815	$ 139,939
Regulatory standard to be well capitalized (as a percent)	10.00%	10.00%
Junior subordinated debentures
Tier I Risk-Based Capital
Actual, Capital Amount	$ 10,200	$ 10,000