Leases - Narrative (Details) $ in Thousands	1 Months Ended	3 Months Ended	12 Months Ended
	Mar. 31, 2019 USD ($) branch corporate_location property	Mar. 31, 2019 USD ($) branch corporate_location property	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Sale Leaseback Transaction [Line Items]
Operating leases, ROU assets			$ 284,255
Operating leases, liabilities			308,060
Operating lease cost			34,175
Sales-type and direct financing leases, lease receivable			478,828	$ 327,300
Sales-type and direct financing lease, unguaranteed residual asset			477,100	326,200
Sales-type and direct financing leases, lease receivables			1,700	1,100
Lease income			19,400	14,700	$ 13,600
Lease costs				29,000	27,700
Sublease income				$ 3,500	$ 3,900
Sale leaseback transaction, March 2019
Sale Leaseback Transaction [Line Items]
Sale leaseback transaction, number of properties | property	26	26
Sale leaseback transaction, number of branches | branch	25	25
Sale leaseback transaction, number of corporate offices | corporate_location	1	1
Sale-leaseback transaction sale price	$ 100,500
Pre-tax net gain sale-leaseback		$ 78,500
Operating leases, ROU assets	78,400	78,400
Operating leases, liabilities	$ 78,400	$ 78,400
Operating lease, term of contract	12 years	12 years
Operating lease cost			$ 7,900