Business Combinations - Focus Business Bank - Pro Forma Information (Details) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2015 USD ($) $ / shares
Pro Forma Information
Net interest income	$ 20,092
Provision for loan losses	(10)
Noninterest income	3,102
Noninterest expense	15,418
Income before income taxes	7,786
Income tax expense	2,923
Net income	$ 4,863
Net income per share - basic (in dollars per share) | $ / shares	$ 0.13
Net income per share - diluted (in dollars per share) | $ / shares	$ 0.13