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Mergers and acquisitions - Business Acquisition, Pro Forma Information (Details) - Northwest Georgia Bank - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Business Acquisition [Line Items]    
Interest income $ 108,857 $ 104,055
Interest expense 9,631 10,663
Net interest income 99,226 93,392
Provision for loan losses (3,064) (2,404)
Noninterest income 91,776 54,131
Noninterest expense 145,060 117,473
Income before income taxes 49,006 32,454
Income taxes 2,964 2,296
Net income $ 46,042 $ 30,158
Earnings per share    
Basic $ 2.68 $ 1.76
Diluted $ 2.68 $ 1.76