Lease Obligations - Schedule of Net Operating Lease Expense (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Leases [Abstract]
Lease expense charged to operations		$ 4,839	$ 4,426	$ 9,514	$ 8,486
Rental income from premises leased to others	[1]	(183)	(165)	(398)	(322)
Net operating lease expense		$ 4,656	$ 4,261	$ 9,116	$ 8,164

[1] Included as reductions to net occupancy and equipment expense in the Condensed Consolidated Statements of Income.