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Summary of Significant Accounting Policies - Premises and Equipment (Details)
12 Months Ended
Dec. 31, 2016
Furniture and equipment  
Property, Plant and Equipment [Line Items]  
Premises and equipment useful life 8 years
Minimum | Equipment  
Property, Plant and Equipment [Line Items]  
Premises and equipment useful life 3 years
Maximum | Equipment  
Property, Plant and Equipment [Line Items]  
Premises and equipment useful life 20 years