Mergers and Acquisitions (Details 2) - Heritage Financial Group - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Interest income	$ 329,138	$ 301,226
Interest expense	28,147	21,858
Net interest income	300,991	279,368
Provision for loan and lease losses	7,530	5,050
Noninterest income	137,231	135,379
Noninterest expense	294,915	309,803
Income before income taxes	135,777	99,894
Income taxes	44,847	31,772
Net income	$ 90,930	$ 68,122
Earnings per share, basic (usd per share)	$ 2.18	$ 1.69
Earnings per share, diluted (usd per share)	$ 2.17	$ 1.68