Business Combinations - Focus Business Bank - Estimated Fair Values of the Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Aug. 20, 2015	Dec. 31, 2014
Assets acquired:
Goodwill	$ 45,664		$ 13,044
Focus Business Bank
Assets acquired:
Cash and cash items		$ 5,651
Federal funds sold and deposits in other financial institutions		168,415
Securities available-for-sale		53,940
Securities held-to-maturity		8,665
Loans held-for-sale--SBA		4,416
Net loans		170,353
Goodwill		32,620
Core deposit intangible asset		6,285
Corporate owned life insurance		7,067
Other assets, net		20,250
Total assets acquired		477,662
Liabilities assumed:
Deposits		405,123
Other liabilities		5,981
Total liabilities		411,104
Net assets acquired		$ 66,558