Acquisitions Infinity Franchise Holdings Acquisition (Details) $ / shares in Units, $ in Thousands		9 Months Ended
	Jan. 30, 2014 USD ($) entity $ / shares shares	Sep. 30, 2015 USD ($)	Dec. 31, 2014 USD ($)	Sep. 30, 2014 USD ($)
Acquisitions
Consideration paid		$ 118,900
Cash consideration		$ 766
Period prior to announcement of the transaction for which average closing price is considered to calculate value of shares to be issued (in days)		20 days
Delinquent loans or adversely classified assets		$ 4,095	$ 1,444	$ 1,782
Goodwill		50,832	$ 22,950	$ 22,950
Total purchase credit impaired loans		$ 5,392
Infinity Franchise Holdings Acquisition
Acquisitions
Consideration paid	$ 17,360
Cash consideration	$ 8,300
Number of shares of common stock issued as consideration | shares	562,469
Stock price of the acquired entity (in dollars per share) | $ / shares	$ 16.02
Period prior to announcement of the transaction for which average closing price is considered to calculate value of shares to be issued (in days)	10 days
Delinquent loans or adversely classified assets	$ 0
Goodwill	$ 5,522
Number of entities in business combination | entity	2
Total purchase credit impaired loans	$ 0