(Parent Company Only) Financial Information - Summary of Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
ASSETS
Other assets	$ 83,567	$ 43,946
TOTAL ASSETS	4,680,932	3,534,780
LIABILITIES AND SHAREHOLDERS' EQUITY
Subordinated debt	70,241	69,961
Other liabilities	32,847	44,974
Shareholders' equity	435,397	353,453	$ 312,651	$ 198,604
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	4,680,932	3,534,780
Parent Company [Member]
ASSETS
Cash	648	364
Securities purchased under agreement to resell with subsidiary bank, maturing within 30 days	12,676	43,323
Investment in subsidiaries	494,809	383,516
Other assets	1,211	10
TOTAL ASSETS	509,344	427,213
LIABILITIES AND SHAREHOLDERS' EQUITY
Subordinated debt	70,241	69,961
Other liabilities	3,706	3,799
Shareholders' equity	435,397	353,453
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 509,344	$ 427,213