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Investment Securities - Schedule Of Investments Within The Available For Sale Portfolio That Had Unrealized Losses (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Schedule of Investments [Line Items] |  |
Less than 12 months | $ 4,221 | $ 960,053
12 months or longer | 1,244,506 | 3,112,632
Total fair value | 1,248,727 | 4,072,685
Unrealized Losses |  |
Less than 12 months | (26) | (15,826)
12 months or longer | (13,549) | (92,005)
Total unrealized losses | (13,575) | (107,831)
U.S. treasuries |  |
Schedule of Investments [Line Items] |  |
Less than 12 months | 0 | 0
12 months or longer | 100 | 98
Total fair value | 100 | 98
Unrealized Losses |  |
Less than 12 months | 0 | 0
12 months or longer | 0 | (2)
Total unrealized losses | 0 | (2)
Government agency issued MBS |  |
Schedule of Investments [Line Items] |  |
Less than 12 months | 2,284 | 597,008
12 months or longer | 515,618 | 1,537,106
Total fair value | 517,902 | 2,134,114
Unrealized Losses |  |
Less than 12 months | (24) | (12,335)
12 months or longer | (5,025) | (46,065)
Total unrealized losses | (5,049) | (58,400)
Government agency issued CMO |  |
Schedule of Investments [Line Items] |  |
Less than 12 months | 0 | 290,863
12 months or longer | 703,604 | 1,560,420
Total fair value | 703,604 | 1,851,283
Unrealized Losses |  |
Less than 12 months | 0 | (2,860)
12 months or longer | (8,388) | (45,821)
Total unrealized losses | (8,388) | (48,681)
Other U.S. government agencies |  |
Schedule of Investments [Line Items] |  |
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 |  |
Schedule of Investments [Line Items] |  |
Less than 12 months | 0 | 25,114
12 months or longer | 25,184 | 15,008
Total fair value | 25,184 | 40,122
Unrealized Losses |  |
Less than 12 months | 0 | (344)
12 months or longer | (136) | (117)
Total unrealized losses | (136) | (461)
States and municipalities |  |
Schedule of Investments [Line Items] |  |
Less than 12 months | 1,937 | 17,292
12 months or longer | 0 | 0
Total fair value | 1,937 | 17,292
Unrealized Losses |  |
Less than 12 months | (2) | (214)
12 months or longer | 0 | 0
Total unrealized losses | $ (2) | $ (214)

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