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Income Taxes - Carryforwards (Details) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Components of deferred tax assets and liabilities    
Deferred Tax assets related to net unrealized losses on held-to-maturity securities transferred from available-for-sale securities $ 2.4 $ 2.8
Alternative minimum tax credit    
Net operating loss carryforward    
Alternative minimum tax credit that can be carried forward 1.7  
Federal    
Net operating loss carryforward    
Net operating loss carryforward 68.9  
Federal | 2030    
Net operating loss carryforward    
Net operating loss carryforward 13.6  
Federal | 2031    
Net operating loss carryforward    
Net operating loss carryforward 31.4  
Federal | 2032    
Net operating loss carryforward    
Net operating loss carryforward 8.6  
Federal | 2033    
Net operating loss carryforward    
Net operating loss carryforward 15.3  
State    
Net operating loss carryforward    
Net operating loss carryforward 112.9  
State | 2021    
Net operating loss carryforward    
Net operating loss carryforward 17.2  
State | 2025    
Net operating loss carryforward    
Net operating loss carryforward $ 95.7