Leases - Right-of-Use Asset and Associated Lease Liability (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Other Assets
Other Commitments [Line Items]
Operating Lease, Right-of-Use Asset	$ 61,863	$ 57,226
Other Liabilities
Other Commitments [Line Items]
Operating Lease, Liability	$ 67,503	$ 63,030