Leases - Narrative (Details) $ in Thousands	1 Months Ended	3 Months Ended			6 Months Ended		12 Months Ended
	Mar. 31, 2019 USD ($) property	Jun. 30, 2019 USD ($) branch corporate_location	Mar. 31, 2019 USD ($) property	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($) branch corporate_location	Jun. 30, 2018 USD ($)	Dec. 31, 2019 USD ($)
Sale Leaseback Transaction [Line Items]
Sales-type and direct financing leases total net investment		$ 377,263			$ 377,263
Sales-type and direct financing leases receivables		1,100			1,100
Sales-type and direct financing leases unguaranteed residuals		376,200			376,200
Lease income		4,600		$ 3,500	8,900	$ 7,200
Operating leases, ROU assets		282,329			282,329
Operating leases, liabilities		305,364			305,364
Expected lease costs		$ 8,949			$ 15,923
Lease costs				8,200		16,400
Sublease income				$ 874		$ 1,800
Sale leaseback transaction, March 2019
Sale Leaseback Transaction [Line Items]
Sale-leaseback, number of properties | property	26		26
Sale-leaseback, number of branches | branch		25			25
Sale-leaseback, number of corporate offices | corporate_location		1			1
Sale-leaseback 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
Sale leaseback transaction, March 2019 | Scenario, forecast
Sale Leaseback Transaction [Line Items]
Expected lease costs							$ 7,900