Parent Company Financial Information (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income
Interest income	$ 17,064	$ 16,895	$ 16,541	$ 13,588	$ 11,736	$ 11,509	$ 11,075	$ 11,073	$ 64,088	$ 45,393	$ 46,321
Expense
Share-based compensation									993	533	331
Interest									5,157	3,867	3,818
Income before income tax benefit and equity in undistributed earnings of subsidiaries	6,695	5,171	4,687	(2,839)	2,942	4,354	4,421	6,121	13,714	17,838	11,239
Income tax benefit									4,749	6,997	(1,798)
Dividends and accretion on preferred stock	168					181	359	358	168	898	1,470
Net income available to common shareholders	4,184	3,429	2,949	(1,765)	1,634	2,580	2,357	3,372	8,797	9,943	11,567
Heritage Oaks Bancorp
Income
Dividends from subsidiaries									10,000	25,309	3,517
Interest income									16	19	25
Total income									10,016	25,328	3,542
Expense
Share-based compensation									211	133	114
Other professional fees and outside services									737	1,169	498
Interest									499	167	192
Total expense									1,447	1,469	804
Income before income tax benefit and equity in undistributed earnings of subsidiaries									8,569	23,859	2,738
Income tax benefit									(576)	(347)	(813)
Net income before equity in undistributed earnings of subsidiaries									9,145	24,206	3,551
Equity in undisbursed income of subsidiaries									180	13,365	(9,486)
Dividends and accretion on preferred stock									168	898	1,470
Net income available to common shareholders									$ 8,797	$ 9,943	$ 11,567