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Income Taxes - Federal net operating loss carryforwards - (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Income Taxes    
Unrecognized tax benefits $ 0.0  
Accrued interest and penalties 0.0  
Peoples    
Income Taxes    
RBIL carryforwards 8.9  
RBIL carryforwards subject to annual limitations 1.5  
Savannah Bancorp ("SAVB")    
Income Taxes    
NOL and RBIL carryforwards 18.9  
NOL and RBIL carryforwards subject to annual limitations 2.0  
Federal    
Income Taxes    
Operating loss carryforwards 27.9 $ 31.3
State    
Income Taxes    
Operating loss carryforwards 72.1 $ 64.4
Valuation allowance relating to operating loss carryforwards $ 2.0