Quarterly Results of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Interest income	$ 45,797	$ 42,429	$ 40,874	$ 37,505	$ 31,911	$ 29,747	$ 30,071	$ 26,626	$ 166,605	$ 118,356	$ 81,339
Interest expense	3,493	3,420	3,313	3,304	3,074	3,051	2,978	2,952	13,530	12,057	7,704
Provision for Loan and Lease Losses	2,054	4,013	1,589	1,120	1,700	1,062	1,833	1,830	8,776	6,425	4,684
Noninterest income	4,318	5,968	4,450	4,848	4,217	4,378	4,380	1,470	19,584	14,441	13,377
Noninterest expense	25,377	25,860	23,695	23,633	18,539	17,374	17,214	20,469	98,565	73,591	54,993
Income tax provision	7,238	5,877	6,358	5,742	4,750	4,801	4,601	1,056	25,215	15,209	10,719
Net income	$ 11,953	$ 9,227	$ 10,369	$ 8,554	$ 8,065	$ 7,837	$ 7,825	$ 1,789	$ 40,103	$ 25,515	$ 16,616
Earnings per share:
Basic (in dollars per share)	$ 0.44	$ 0.34	$ 0.38	$ 0.33	$ 0.38	$ 0.36	$ 0.36	$ 0.09	$ 1.49	$ 1.21	$ 0.97
Diluted (in dollars per share)	$ 0.43	$ 0.33	$ 0.37	$ 0.33	$ 0.37	$ 0.36	$ 0.36	$ 0.09	$ 1.46	$ 1.19	$ 0.96