Derivatives and Hedging - Netting Arrangements (Details) - USD ($) $ in Thousands		Sep. 30, 2020	Dec. 31, 2019
Derivative financial assets:
Derivative assets, total derivatives subject to a master netting arrangement, gross amounts recognized		$ 46,217	$ 41,390
Derivative assets, total derivative subject to a master netting arrangement, gross amounts offset in the condensed consolidated balance sheet		0	0
Derivative assets, total derivatives subject to a master netting arrangement, net amount presented in the condensed consolidated balance sheets		46,217	41,390
Derivative assets, total derivatives subject to a master netting arrangement, financial instruments collateral received/pledged	[1]	0	0
Derivate assets, total derivatives subject to a master netting arrangement, cash collateral received/pledged	[1]	3,502	5,860
Derivative asset, total derivatives subject to a master netting arrangement, net amount		42,715	35,530
Derivative assets, total derivatives not subject to a master netting arrangement		735,903	313,592
Derivative assets, total derivatives not subject to a master netting arrangement, net amount		735,903	313,592
Total derivative financial assets, gross amounts recognized		782,120	354,982
Total derivative financial assets, net amount presented in the condensed consolidated balance sheet		782,120	354,982
Total derivative financial assets, net amount		778,618	349,122
Derivative financial liabilities:
Derivative liabilities, total derivative subject to a master netting arrangement, gross amounts recognized		174,188	94,979
Derivative liabilities, total derivative subject to a master netting arrangement, gross amount offset in the condensed consolidated balance sheets		0	0
Derivative liabilities, total derivative subject to a master netting arrangement, net amount presented in the condensed consolidated balance sheets		174,188	94,979
Derivative liabilities, total derivatives subject to a master netting arrangement, financial instruments collateral received/pledged	[1]	0	0
Derivative liabilities, total derivative subject to a master netting arrangement, cash collateral received/pledged	[1]	174,188	94,979
Derivate liabilities, total derivatives subject to master netting arrangement, net amount		0	0
Derivative liabilities, total derivatives not subject to a master netting arrangement		31,855	40,921
Derivative liabilities, total derivatives not subject to a master netting arrangement, net amount		31,855	40,921
Derivative liabilities, total derivative financial liabilities, gross amount recognized		206,043	135,900
Total derivative financial liabilities, net amount presented in the condensed consolidated balance sheets		206,043	135,900
Total derivative financial liabilities, net amount		$ 31,855	$ 40,921

[1] The actual amount of collateral received/pledged is limited to the asset/liability balance and does not include excess collateral received/pledged. When excess collateral exists, the collateral shown in the table above has been allocated based on the percentage of the actual amount of collateral posted.