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Investment Securities Schedule of Amortized Cost and Fair Values of Debt Securities by Contractual Maturities (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Amortized Cost |  |
Due in one year or less | $ 6,738 |
Due from one year to five years | 69,672 |
Due from five years to ten years | 108,091 |
Due after ten years | 348,332 |
Amortized cost, before securities without debt maturities | 532,833 |
Amortized cost basis | 2,115,265 |
Due in one year or less | 0 |
Due from five years to ten years | 0 |
Due from five years to ten years | 0 |
Due after ten years | 156,134 |
Amortized cost, before securities without debt maturities | 156,134 |
Amortized cost basis | 606,679 | $ 0
Estimated Fair Value |  |
Due in one year or less | 6,740 |
Due from one year to five years | 70,182 |
Due from five years to ten years | 106,709 |
Due after ten years | 339,623 |
Available for sale securities, debt maturities, before securities without single maturities | 523,254 |
Estimated Fair Value | 2,080,294 | $ 2,547,956
Due in one year or less | 0 |
Due from one year to five years | 0 |
Due from five years to ten years | 0 |
Due after ten years | 157,207 |
Held to maturity securities, before securities without single maturities | 157,207 |
Debt Securities, Held-to-maturity | 611,419 |
Residential mortgage-backed securities |  |
Amortized Cost |  |
Available-for-sale securities, amortized cost without single maturity date | 476,973 |
Amortized cost basis | 476,973 |
Held to maturity securities, amortized cost without single maturity date | 450,545 |
Amortized cost basis | 450,545 |
Estimated Fair Value |  |
Available-for-sale securities, debt maturities, without single maturity date, fair value | 463,344 |
Estimated Fair Value | 463,344 |
Held to maturity securities, without single maturities | 454,212 |
Debt Securities, Held-to-maturity | 454,212 |
Collateralized mortgage obligations |  |
Amortized Cost |  |
Available-for-sale securities, amortized cost without single maturity date | 264,165 |
Amortized cost basis | 841,294 |
Held to maturity securities, amortized cost without single maturity date | 0 |
Estimated Fair Value |  |
Available-for-sale securities, debt maturities, without single maturity date, fair value | 261,616 |
Estimated Fair Value | 832,080 |
Held to maturity securities, without single maturities | 0 |
Residential mortgage-backed securities |  |
Amortized Cost |  |
Available-for-sale securities, amortized cost without single maturity date | 841,294 |
Amortized cost basis | 264,165 |
Held to maturity securities, amortized cost without single maturity date | 0 |
Estimated Fair Value |  |
Available-for-sale securities, debt maturities, without single maturity date, fair value | 832,080 |
Estimated Fair Value | 261,616 |
Held to maturity securities, without single maturities | $ 0 |

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