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Investment Securities - Schedule Of Investments Within The Available For Sale Portfolio That Had Unrealized Losses (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Fair Value |  |
Less than 12 months | $ 2,405 | $ 960,053
12 months or longer | 3,688,411 | 3,112,632
Total fair value | 3,690,816 | 4,072,685
Unrealized Losses |  |
Less than 12 months | (13) | (15,826)
12 months or longer | (50,497) | (92,005)
Total unrealized losses | (50,510) | (107,831)
U.S. treasuries |  |
Fair Value |  |
Less than 12 months | 0 | 0
12 months or longer | 99 | 98
Total fair value | 99 | 98
Unrealized Losses |  |
Less than 12 months | 0 | 0
12 months or longer | (1) | (2)
Total unrealized losses | (1) | (2)
Government agency issued MBS |  |
Fair Value |  |
Less than 12 months | 1,542 | 597,008
12 months or longer | 1,948,718 | 1,537,106
Total fair value | 1,950,260 | 2,134,114
Unrealized Losses |  |
Less than 12 months | (13) | (12,335)
12 months or longer | (21,347) | (46,065)
Total unrealized losses | (21,360) | (58,400)
Government agency issued CMO |  |
Fair Value |  |
Less than 12 months | 863 | 290,863
12 months or longer | 1,699,529 | 1,560,420
Total fair value | 1,700,392 | 1,851,283
Unrealized Losses |  |
Less than 12 months | 0 | (2,860)
12 months or longer | (28,765) | (45,821)
Total unrealized losses | (28,765) | (48,681)
Other U.S. government agencies |  |
Fair Value |  |
Less than 12 months |  | 29,776
12 months or longer |  | 0
Total fair value |  | 29,776
Unrealized Losses |  |
Less than 12 months |  | (73)
12 months or longer |  | 0
Total unrealized losses |  | (73)
Corporates and other debt |  |
Fair Value |  |
Less than 12 months | 0 | 25,114
12 months or longer | 40,065 | 15,008
Total fair value | 40,065 | 40,122
Unrealized Losses |  |
Less than 12 months | 0 | (344)
12 months or longer | (384) | (117)
Total unrealized losses | $ (384) | (461)
States and municipalities |  |
Fair Value |  |
Less than 12 months |  | 17,292
12 months or longer |  | 0
Total fair value |  | 17,292
Unrealized Losses |  |
Less than 12 months |  | (214)
12 months or longer |  | 0
Total unrealized losses |  | $ (214)

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