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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, 2019 | Dec. 31, 2018
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Available for sale: |  |
Fair value, less than 12 months | $ 209,786 | $ 221,140
Unrealized losses, less than 12 Months | (600) | (2,223)
Fair value, 12 months or more | 1,593,578 | 2,537,693
Unrealized losses, 12 Months or More | (16,597) | (77,051)
Fair value, Total | 1,803,364 | 2,758,833
Unrealized losses, Total | (17,197) | (79,274)
Residential mortgage-backed securities |  |
Available for sale: |  |
Fair value, less than 12 months | 209,786 | 208,384
Unrealized losses, less than 12 Months | (600) | (2,124)
Fair value, 12 months or more | 1,593,578 | 2,537,181
Unrealized losses, 12 Months or More | (16,597) | (77,045)
Fair value, Total | 1,803,364 | 2,745,565
Unrealized losses, Total | $ (17,197) | (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 |  | 512
Unrealized losses, 12 Months or More |  | (6)
Fair value, Total |  | 13,268
Unrealized losses, Total |  | $ (105)

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