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Investment Securities Narrative (Details) - USD ($) $ in Thousands | Aug. 01, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
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Debt Securities, Available-For-Sale, Transfer To Held-To-Maturity, Amortized Cost | $ 665,500 |  |  |
Debt Securities, Available-For-Sale, Transfer To Held-To-Maturity, Fair Value | 641,700 |  |  |
Amortized cost basis |  | $ 2,115,265 |  |
Estimated Fair Value |  | 2,080,294 | $ 2,547,956 |
Residential mortgage-backed securities |  |  |  |
Debt Securities, Available-For-Sale, Transfer To Held-To-Maturity, Amortized Cost | 505,500 |  |  |
Debt Securities, Available-For-Sale, Transfer To Held-To-Maturity, Fair Value | 485,300 |  |  |
Amortized cost basis |  | 476,973 |  |
Estimated Fair Value |  | 463,344 |  |
Auction rate securities |  |  |  |
Amortized cost basis |  | 107,410 |  |
Estimated Fair Value |  | 102,994 |  |
State and municipal securities |  |  |  |
Debt Securities, Available-For-Sale, Transfer To Held-To-Maturity, Amortized Cost | 160,000 |  |  |
Debt Securities, Available-For-Sale, Transfer To Held-To-Maturity, Fair Value | $ 156,400 |  |  |
Amortized cost basis |  | 282,383 |  |
Estimated Fair Value |  | 279,095 |  |
Pooled trust preferred securities |  |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held |  | 11,500 | 11,500 | $ 11,500
Collateral Pledged |  |  |  |
Available-for-sale securities pledged as collateral |  | $ 1,000,000 | $ 1,800,000 |

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