Acquisitions San Diego Trust Bank Acquisition - Narrative (Details) $ in Thousands	Jun. 25, 2013 USD ($)	Jun. 25, 2013 USD ($) entity shares	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Business Acquisition [Line Items]
Goodwill			$ 50,832	$ 22,950	$ 17,428
San Diego Trust Bank
Business Acquisition [Line Items]
Consideration paid	$ 30,600	$ 30,622
Cash consideration		$ 16,200
Number of shares of common stock issued as consideration | shares		1,198,255
Goodwill	$ 5,574	$ 5,574	$ 5,600
Number of entities in business combination | entity		2