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Investments (Unrealized Losses) (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Investment securities available for sale: |  |
Fair Value, Less than 12 months | $ 1,817,847 | $ 705,526
Unrealized Losses, Less than 12 months | 5,841 | 3,943
Fair Value, 12 months or more | 550,090 | 2,796,627
Unrealized Losses, Greater than 12 months | 3,641 | 52,489
Fair Value, Total | 2,367,937 | 3,502,153
Unrealized Losses, Total | 9,482 | 56,432
Investment securities held to maturity |  |
Unrealized Losses, Total | 0 |
U. S. Treasury |  |
Investment securities available for sale: |  |
Fair Value, Less than 12 months | 49,867 | 248,983
Unrealized Losses, Less than 12 months | 2 | 113
Fair Value, 12 months or more | 0 | 848,622
Unrealized Losses, Greater than 12 months | 0 | 2,053
Fair Value, Total | 49,867 | 1,097,605
Unrealized Losses, Total | 2 | 2,166
Agency Securities |  |
Investment securities available for sale: |  |
Fair Value, Less than 12 months | 323,470 | 115,273
Unrealized Losses, Less than 12 months | 1,471 | 601
Fair Value, 12 months or more | 66,278 | 2,310
Unrealized Losses, Greater than 12 months | 341 | 38
Fair Value, Total | 389,748 | 117,583
Unrealized Losses, Total | 1,812 | 639
Mortgage-backed securities |  |
Investment securities available for sale: |  |
Fair Value, Less than 12 months | 1,413,342 | 262,204
Unrealized Losses, Less than 12 months | 4,165 | 2,387
Fair Value, 12 months or more | 477,249 | 1,940,695
Unrealized Losses, Greater than 12 months | 3,178 | 50,376
Fair Value, Total | 1,890,591 | 2,202,899
Unrealized Losses, Total | 7,343 | 52,763
Investment securities held to maturity |  |
Fair Value, Less than 12 months |  | 5,111
Unrealized Losses, Less than 12 months |  | 181
Fair Value, 12 months or more |  | 10,131
Unrealized Losses, 12 months or more |  | 309
Fair Value, Total |  | 15,242
Unrealized Losses, Total | 0 | 490
Corporate bonds |  |
Investment securities available for sale: |  |
Fair Value, Less than 12 months |  | 79,066
Unrealized Losses, Less than 12 months |  | 842
Fair Value, 12 months or more |  | 5,000
Unrealized Losses, Greater than 12 months |  | 22
Fair Value, Total |  | 84,066
Unrealized Losses, Total |  | 864
Corporate Bonds |  |
Investment securities available for sale: |  |
Fair Value, Less than 12 months | 31,168 |
Unrealized Losses, Less than 12 months | 203 |
Fair Value, 12 months or more | 6,563 |
Unrealized Losses, Greater than 12 months | 122 |
Fair Value, Total | 37,731 |
Unrealized Losses, Total | 325 | $ 864
Other |  |
Investment securities held to maturity |  |
Unrealized Losses, Total | $ 0 |

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