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Investments (Unrealized Losses) (Details) - USD ($) | Mar. 31, 2019 | Dec. 31, 2018
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Schedule of Investments [Line Items] |  |
Unrealized losses related to marketability of securities or issuer's ability to honor redemption obligations | $ 0 |
Investment securities available for sale: |  |
Fair Value, Less than 12 months | 390,651,000 | 705,526,000
Unrealized Losses, Less than 12 months | 2,106,000 | 3,943,000
Fair Value, 12 months or more | 2,578,426,000 | 2,796,627,000
Unrealized Losses, Greater than 12 months | 29,217,000 | 52,489,000
Fair Value, Total | 2,969,077,000 | 3,502,153,000
Unrealized Losses, Total | 31,323,000 | 56,432,000
U. S. Treasury |  |
Investment securities available for sale: |  |
Fair Value, Less than 12 months | 0 | 248,983,000
Unrealized Losses, Less than 12 months | 0 | 113,000
Fair Value, 12 months or more | 599,883,000 | 848,622,000
Unrealized Losses, Greater than 12 months | 847,000 | 2,053,000
Fair Value, Total | 599,883,000 | 1,097,605,000
Unrealized Losses, Total | 847,000 | 2,166,000
Agency Securities |  |
Investment securities available for sale: |  |
Fair Value, Less than 12 months | 219,395,000 | 115,273,000
Unrealized Losses, Less than 12 months | 901,000 | 601,000
Fair Value, 12 months or more | 12,590,000 | 2,310,000
Unrealized Losses, Greater than 12 months | 186,000 | 38,000
Fair Value, Total | 231,985,000 | 117,583,000
Unrealized Losses, Total | 1,087,000 | 639,000
Mortgage Backed Securities |  |
Investment securities available for sale: |  |
Fair Value, Less than 12 months | 114,863,000 | 262,204,000
Unrealized Losses, Less than 12 months | 314,000 | 2,387,000
Fair Value, 12 months or more | 1,956,003,000 | 1,940,695,000
Unrealized Losses, Greater than 12 months | 28,115,000 | 50,376,000
Fair Value, Total | 2,070,866,000 | 2,202,899,000
Unrealized Losses, Total | 28,429,000 | 52,763,000
Investment securities held to maturity |  |
Fair Value, Less than 12 months | 40,142,000 | 5,111,000
Unrealized Losses, Less than 12 months | 291,000 | 181,000
Fair Value, 12 months or more | 9,988,000 | 10,131,000
Unrealized Losses, 12 months or more | 159,000 | 309,000
Fair Value, Total | 50,130,000 | 15,242,000
Unrealized Losses, Total | 450,000 | 490,000
Corporate bonds |  |
Investment securities available for sale: |  |
Fair Value, Less than 12 months |  | 79,066,000
Unrealized Losses, Less than 12 months |  | 842,000
Fair Value, 12 months or more |  | 5,000,000
Unrealized Losses, Greater than 12 months |  | 22,000
Fair Value, Total |  | 84,066,000
Unrealized Losses, Total |  | 864,000
Corporate Bonds |  |
Investment securities available for sale: |  |
Fair Value, Less than 12 months | 56,393,000 |
Unrealized Losses, Less than 12 months | 891,000 |
Fair Value, 12 months or more | 9,950,000 |
Unrealized Losses, Greater than 12 months | 69,000 |
Fair Value, Total | 66,343,000 |
Unrealized Losses, Total | 960,000 | 864,000
Other |  |
Investment securities available for sale: |  |
Unrealized Losses, Total | $ 0 | $ 0

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