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Premises and Equipment (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Abstract]      
Depreciation and amortization expense $ 3.1 $ 3.2 $ 2.7
Operating Leases, Rent Expense, Net $ 2.3 $ 2.3 $ 2.5