XML 91 R76.htm IDEA: XBRL DOCUMENT v3.8.0.1
Premises and Equipment (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Abstract]      
Depreciation and amortization expense $ 3.2 $ 2.7 $ 2.3
Operating Leases, Rent Expense, Net $ 2.3 $ 2.5 $ 2.1