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Investment Securities - Schedule of Debt Securities Expected Maturity (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Amortized Cost |  |  |
Due within 1 year |  | $ 520 |
Due after 1 but within 5 years |  | 7,218 |
Due after 5 but within 10 years |  | 34,993 |
Due after 10 years |  | 0 |
Amortized Cost |  | 42,731 |
Debt Securities, Held-to-maturity |  | 393,855 | $ 422,096
Estimated Fair Value |  |  |
Due within 1 year |  | 519 |
Due after 1 but within 5 years |  | 7,210 |
Due after 5 but within 10 years |  | 34,864 |
Due after 10 years |  | 0 |
Estimated Fair Value |  | 42,593 |
Securities held to maturity, fair value |  | 383,993 | $ 418,249
Mortgage-Backed Securities [Member] |  |  |
Amortized Cost |  |  |
Debt Securities, Held-to-maturity | [1] | 351,124 |
Estimated Fair Value |  |  |
Securities held to maturity, fair value | [1] | 341,400 |
Mortgage-Backed Securities [Member] | US Government Agencies Debt Securities [Member] |  |  |
Amortized Cost |  |  |
Debt Securities, Held-to-maturity |  | 58,900 |
Estimated Fair Value |  |  |
Securities held to maturity, fair value |  | 56,400 |
Mortgage-Backed Securities [Member] | Obligations of U.S. Government-Sponsored Enterprises [Member] |  |  |
Amortized Cost |  |  |
Debt Securities, Held-to-maturity |  | 292,300 |
Estimated Fair Value |  |  |
Securities held to maturity, fair value |  | $ 285,000 |
[1] | Mortgage Backed Securities include an amortized cost of $58.9 million and a fair value of $56.4 million for Obligations of U.S. Government agencies issued by Ginnie Mae and an amortized cost of $292.3 million and a fair value of $285.0 million for Obligations of U.S. Government-sponsored enterprises issued by Fannie Mae and Freddie Mac.

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