Subsequent Events (Details) $ / shares in Units, $ in Thousands	Apr. 01, 2017 USD ($) shares	Mar. 31, 2017 USD ($) $ / shares	Dec. 31, 2016 USD ($)	Mar. 31, 2016 USD ($)	Jan. 29, 2016 $ / shares
Assets		$ 4,174,428	$ 4,036,311
Gross loans		3,393,537	3,245,694	$ 2,850,494
Deposits		$ 3,297,073	$ 3,145,581
Closing stock price of common stock ($ per share) | $ / shares		$ 38.55			$ 20.53
Subsequent Event | Heritage Oaks Bancorp
Assets	$ 2,000,000
Gross loans	1,400,000
Deposits	$ 1,700,000
Equity issued (shares)	0.3471
Consideration paid	$ 482,000
Cash consideration	$ 1,400
Subsequent Event | Heritage Oaks Bancorp | Common Stock
Number of shares of common stock issued as consideration | shares	11,959,535