Other Operating Expenses - Rental Expenses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating Leased Assets [Line Items]
Equipment expense	$ 16,323	$ 19,366	$ 16,683
Equipment Rentals
Operating Leased Assets [Line Items]
Equipment expense	2,922	2,200	2,300
Leasing of ATMs
Operating Leased Assets [Line Items]
Equipment expense	1,697	1,335	1,338
Occupancy Expense
Operating Leased Assets [Line Items]
Operating leases, rent expense	$ 10,456	$ 5,580	$ 4,643