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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
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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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