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Investment Securities - Schedule of Debt Securities Expected Maturity (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Amortized Cost |  |  |
Due within 1 year |  | $ 2,500 |
Due after 1 but within 5 years |  | 7,669 |
Due after 5 but within 10 years |  | 20,126 |
Due after 10 years |  | 4,896 |
Amortized Cost |  | 35,191 |
Debt Securities, Held-to-maturity |  | 361,844 | $ 337,123
Estimated Fair Value |  |  |
Due within 1 year |  | 2,525 |
Due after 1 but within 5 years |  | 7,742 |
Due after 5 but within 10 years |  | 20,689 |
Due after 10 years |  | 4,940 |
Estimated Fair Value |  | 35,896 |
Securities held to maturity, fair value |  | 369,851 | $ 338,718
Mortgage-Backed Securities [Member] |  |  |
Amortized Cost |  |  |
Debt Securities, Held-to-maturity | [1] | 326,653 |
Estimated Fair Value |  |  |
Securities held to maturity, fair value | [1] | 333,955 |
Mortgage-Backed Securities [Member] | US Government Agencies Debt Securities [Member] |  |  |
Amortized Cost |  |  |
Debt Securities, Held-to-maturity |  | 39,600 |
Estimated Fair Value |  |  |
Securities held to maturity, fair value |  | 41,100 |
Mortgage-Backed Securities [Member] | Obligations of U.S. Government-Sponsored Enterprises [Member] |  |  |
Amortized Cost |  |  |
Debt Securities, Held-to-maturity |  | 287,100 |
Estimated Fair Value |  |  |
Securities held to maturity, fair value |  | $ 292,800 |
[1] | Mortgage Backed Securities include an amortized cost of $39.6 million and a fair value of $41.1 million for Obligations of U.S. Government agencies issued by Ginnie Mae and an amortized cost of $287.1 million and a fair value of $292.8 million for Obligations of U.S. Government-sponsored enterprises issued by Fannie Mae and Freddie Mac.

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