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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, 2019 | Dec. 31, 2018
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Available for sale: |  |
Fair value, less than 12 months | $ 20 | $ 221,140
Unrealized losses, less than 12 Months |  | (2,223)
Fair value, 12 months or more | 2,538,068 | 2,537,693
Unrealized losses, 12 Months or More | (49,566) | (77,051)
Fair value, Total | 2,538,088 | 2,758,833
Unrealized losses, Total | (49,566) | (79,274)
Residential mortgage-backed securities |  |
Available for sale: |  |
Fair value, less than 12 months | 20 | 208,384
Unrealized losses, less than 12 Months |  | (2,124)
Fair value, 12 months or more | 2,533,666 | 2,537,181
Unrealized losses, 12 Months or More | (49,551) | (77,045)
Fair value, Total | 2,533,686 | 2,745,565
Unrealized losses, Total | (49,551) | (79,169)
Obligations of states and political subdivisions |  |
Available for sale: |  |
Fair value, less than 12 months |  | 12,756
Unrealized losses, less than 12 Months |  | (99)
Fair value, 12 months or more | 4,402 | 512
Unrealized losses, 12 Months or More | (15) | (6)
Fair value, Total | 4,402 | 13,268
Unrealized losses, Total | $ (15) | $ (105)

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