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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
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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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