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Investment Securities and Equity Securities with Readily Determinable Fair Values (Fair Value and Gross Unrealized Loss) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Available for sale:
Fair value, less than 12 months	$ 1,194,001	$ 523,797
Unrealized losses, less than 12 Months	(4,069)	(2,274)
Fair value, 12 months or more	757	1,448,109
Unrealized losses, 12 Months or More	(14)	(14,340)
Fair value, Total	1,194,758	1,971,906
Unrealized losses, Total	(4,083)	(16,614)
Residential mortgage-backed securities
Available for sale:
Fair value, less than 12 months	1,194,001	523,031
Unrealized losses, less than 12 Months	(4,069)	(2,269)
Fair value, 12 months or more		1,448,109
Unrealized losses, 12 Months or More		(14,340)
Fair value, Total	1,194,001	1,971,140
Unrealized losses, Total	(4,069)	(16,609)
Obligations of states and political subdivisions
Available for sale:
Fair value, less than 12 months		766
Unrealized losses, less than 12 Months		(5)
Fair value, 12 months or more	757
Unrealized losses, 12 Months or More	(14)
Fair value, Total	757	766
Unrealized losses, Total	$ (14)	$ (5)

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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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