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Premises and Equipment (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Property, Plant and Equipment [Abstract]      
Depreciation and amortization expense $ 2.7 $ 2.3 $ 1.5
Operating Leases, Rent Expense, Net $ 2.5 $ 2.1 $ 1.6