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Investment Securities and Equity Securities with Readily Determinable Fair Values (Fair Value and Gross Unrealized Loss) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Available for sale:
Fair value, less than 12 months	$ 1,518,962	$ 1,462,232
Unrealized losses, less than 12 Months	(9,120)	(9,339)
Fair value, 12 months or more	536	757
Unrealized losses, 12 Months or More	(10)	(14)
Fair value, Total	1,519,498	1,462,989
Unrealized losses, Total	(9,130)	(9,353)
Collateralized Mortgage Backed Securities [Member]
Available for sale:
Fair value, less than 12 months	1,518,962	1,462,232
Unrealized losses, less than 12 Months	(9,120)	(9,339)
Fair value, Total	1,518,962	1,462,232
Unrealized losses, Total	(9,120)	(9,339)
US States and Political Subdivisions Debt Securities [Member]
Available for sale:
Fair value, 12 months or more	536	757
Unrealized losses, 12 Months or More	(10)	(14)
Fair value, Total	536	757
Unrealized losses, Total	$ (10)	$ (14)

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