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Investment Securities - Schedule Of Investments Within The Available For Sale Portfolio That Had Unrealized Losses (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract] |  |
Fair value, less than 12 months | $ 960,053 |
Unrealized losses, less than 12 months | (15,826) |
Fair value, 12 months or longer | 3,112,632 |
Unrealized loss, 12 months or longer | (92,005) |
Fair value, total | 4,072,685 |
Unrealized losses, total | (107,831) |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Fair value, less than 12 months |  | $ 2,514,856
Unrealized losses, less than 12 months |  | (12,243)
Fair value, 12 months or longer |  | 1,164,073
Unrealized losses, 12 months or longer |  | (35,674)
Fair value, total |  | 3,678,929
Unrealized losses, total |  | (47,917)
US treasury and government |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract] |  |
Fair value, less than 12 months | 0 |
Unrealized losses, less than 12 months | 0 |
Fair value, 12 months or longer | 98 |
Unrealized loss, 12 months or longer | (2) |
Fair value, total | 98 |
Unrealized losses, total | (2) |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Fair value, less than 12 months |  | 99
Unrealized losses, less than 12 months |  | (1)
Fair value, 12 months or longer |  | 0
Unrealized losses, 12 months or longer |  | 0
Fair value, total |  | 99
Unrealized losses, total |  | (1)
Government agency issued mortgage-backed securities (“MBS”) |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract] |  |
Fair value, less than 12 months | 597,008 |
Unrealized losses, less than 12 months | (12,335) |
Fair value, 12 months or longer | 1,537,106 |
Unrealized loss, 12 months or longer | (46,065) |
Fair value, total | 2,134,114 |
Unrealized losses, total | (58,400) |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Fair value, less than 12 months |  | 1,455,476
Unrealized losses, less than 12 months |  | (4,738)
Fair value, 12 months or longer |  | 331,900
Unrealized losses, 12 months or longer |  | (8,866)
Fair value, total |  | 1,787,376
Unrealized losses, total |  | (13,604)
Government agency issued collateralized mortgage obligations (“CMO”) |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract] |  |
Fair value, less than 12 months | 290,863 |
Unrealized losses, less than 12 months | (2,860) |
Fair value, 12 months or longer | 1,560,420 |
Unrealized loss, 12 months or longer | (45,821) |
Fair value, total | 1,851,283 |
Unrealized losses, total | (48,681) |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Fair value, less than 12 months |  | 1,043,987
Unrealized losses, less than 12 months |  | (7,464)
Fair value, 12 months or longer |  | 832,173
Unrealized losses, 12 months or longer |  | (26,808)
Fair value, total |  | 1,876,160
Unrealized losses, total |  | (34,272)
Other U.S. government agencies |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract] |  |
Fair value, less than 12 months | 29,776 |
Unrealized losses, less than 12 months | (73) |
Fair value, 12 months or longer | 0 |
Unrealized loss, 12 months or longer | 0 |
Fair value, total | 29,776 |
Unrealized losses, total | (73) |
Corporates and other debt |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract] |  |
Fair value, less than 12 months | 25,114 |
Unrealized losses, less than 12 months | (344) |
Fair value, 12 months or longer | 15,008 |
Unrealized loss, 12 months or longer | (117) |
Fair value, total | 40,122 |
Unrealized losses, total | (461) |
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract] |  |
Fair value, less than 12 months |  | 15,294
Unrealized losses, less than 12 months |  | (40)
Fair value, 12 months or longer |  | 0
Unrealized losses, 12 months or longer |  | 0
Fair value, total |  | 15,294
Unrealized losses, total |  | $ (40)
State and municipalities |  |
Debt Securities, Available-for-sale, Unrealized Loss Position [Abstract] |  |
Fair value, less than 12 months | 17,292 |
Unrealized losses, less than 12 months | (214) |
Fair value, 12 months or longer | 0 |
Unrealized loss, 12 months or longer | 0 |
Fair value, total | 17,292 |
Unrealized losses, total | $ (214) |

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