Noninterest Expense (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Noninterest Expense
Salaries and employee benefits									$ 35,146	$ 26,250	$ 23,450
Occupancy and equipment									4,300	4,053	4,043
Acquisition and integration related costs	$ 2,991	$ 2,865	$ 423	$ 119					3,546	895
Professional fees									1,828	1,891	2,588
Data processing									1,371	969	1,078
Software subscriptions									1,214	999	1,289
Insurance expense									1,127	1,126	1,032
FDIC deposit insurance premiums									1,092	892	894
Correspondent bank charges									1,021	760	684
Amortization of other intangible assets									1,043	510	473
Foreclosed assets									(94)	53	(251)
Other									7,079	5,824	5,190
Total noninterest expense	$ 17,361	$ 16,419	$ 12,617	$ 12,276	$ 12,415	$ 10,492	$ 10,769	$ 10,546	58,673	$ 44,222	$ 40,470
Pre-tax severance and retention cost									$ 2,887