(Parent Company Only) Financial Information - Summary of Balance Sheet (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
ASSETS
Other assets	$ 43,946	$ 38,835
TOTAL ASSETS	3,534,780	3,093,335
LIABILITIES AND SHAREHOLDERS' EQUITY
Subordinated debt	69,961	64,583
Other liabilities	44,974	15,927
Shareholders' equity	353,453	312,651	$ 198,604	$ 165,546
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	3,534,780	3,093,335
Parent Company [Member]
ASSETS
Cash	364	480
Securities purchased under agreement to resell with subsidiary bank, maturing within 30 days	43,323	37,836
Investment in subsidiaries	383,516	341,302
Other assets	10	0
TOTAL ASSETS	427,213	379,618
LIABILITIES AND SHAREHOLDERS' EQUITY
Subordinated debt	69,961	64,584
Other liabilities	3,799	2,383
Shareholders' equity	353,453	312,651
TOTAL LIABILITIES AND SHAREHOLDERS' EQUITY	$ 427,213	$ 379,618