Business Combinations - Focus Business Bank - Pro Forma Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2015
Pro Forma Information
Net interest income	$ 20,665	$ 40,757
Provision for loan losses	22	12
Noninterest income	2,603	5,705
Noninterest expense	14,917	30,335
Income before income taxes	8,329	16,115
Income tax expense	3,203	6,126
Net income	$ 5,126	$ 9,989
Net income per share - basic (in dollars per share)	$ 0.14	$ 0.27
Net income per share - diluted (in dollars per share)	$ 0.13	$ 0.26