Mergers and Acquisitions-Proforma (Details) - Heritage Financial Group - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Interest income	$ 301,226	$ 305,868
Interest expense	21,858	29,575
Net interest income	279,368	276,293
Provision for loan and lease losses	5,050	7,736
Noninterest income	135,379	107,218
Noninterest expense	309,803	270,868
Income before income taxes	99,894	104,907
Income taxes	31,772	32,723
Net income	$ 68,122	$ 72,184
Earnings per share, Basic (in dollars per share)	$ 1.69	$ 1.80
Earnings per share, Diluted (in dollars per share)	$ 1.68	$ 1.79