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Investment Securities, Equity Securities with Readily Determinable Fair Values and Other Investments (Unrealized Losses) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Available for sale:
Fair value, less than 12 months	$ 3,181,601	$ 3,037,188
Unrealized losses, less than 12 Months	(237,429)	(53,060)
Fair value, 12 months or more	515,872	423,733
Unrealized losses, 12 Months or More	(28,100)	(5,177)
Fair value, Total	3,697,473	3,460,921
Unrealized losses, Total	(265,529)	(58,237)
Residential Mortgage Backed Securities [Member]
Available for sale:
Fair value, less than 12 months	3,181,601	3,037,188
Unrealized losses, less than 12 Months	(237,429)	(53,060)
Fair value, 12 months or more	515,872	423,733
Unrealized losses, 12 Months or More	(28,100)	(5,177)
Fair value, Total	3,697,473	3,460,921
Unrealized losses, Total	$ (265,529)	$ (58,237)

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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