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Accumulated Other Comprehensive Income (Loss) (Components of AOCI) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance $ 4,987,243 $ 4,734,593 $ 5,017,617 $ 4,423,974
Other comprehensive income 10,180 9,005 51,722 57,207
Ending balance 5,126,106 4,882,664 5,126,106 4,882,664
AFS Debt Securities        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance 42,850 5,217 (2,419) (45,821)
Net unrealized gains (losses) arising during the period 5,126 11,904 58,262 65,061
Amounts reclassified from AOCI (492) (41) (8,359) (2,160)
Other comprehensive income 4,634 11,863 49,903 62,901
Ending balance 47,484 17,080 47,484 17,080
Cash Flow Hedges        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (1,333) 0 0 0
Net unrealized gains (losses) arising during the period 25 0 (1,038) 0
Amounts reclassified from AOCI 62 0 (208) 0
Other comprehensive income 87 0 (1,246) 0
Ending balance (1,246) 0 (1,246) 0
Foreign Currency Translation Adjustments, Net of Hedges        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (18,383) (15,189) (15,989) (12,353)
Net unrealized gains (losses) arising during the period 5,459 (2,858) 3,065 (5,694)
Amounts reclassified from AOCI 0 0 0 0
Other comprehensive income 5,459 (2,858) 3,065 (5,694)
Ending balance (12,924) (18,047) (12,924) (18,047)
AOCI, Net of Tax        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance 23,134 (9,972) (18,408) (58,174)
Net unrealized gains (losses) arising during the period 10,610 9,046 60,289 59,367
Amounts reclassified from AOCI (430) (41) (8,567) (2,160)
Other comprehensive income 10,180 9,005 51,722 57,207
Ending balance $ 33,314 $ (967) $ 33,314 $ (967)