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SECURITIES - Held to Maturity Investment Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Amortized Cost, Held to maturity: |  |
Within one year | $ 1,670 |
One to five years | 28,305 |
Five to ten years | 14,216 |
Beyond ten years | 56,743 |
Total | 100,934 | $ 133,638
Estimated Fair Value, Held to maturity: |  |
Within one year | 1,676 |
One to five years | 29,522 |
Five to ten years | 15,081 |
Beyond ten years | 58,632 |
Estimated Fair Value | 104,911 | 135,027
State and municipal obligations |  |
Amortized Cost, Held to maturity: |  |
Total | 26,886 | 41,008
Estimated Fair Value, Held to maturity: |  |
Estimated Fair Value | 28,374 | 41,817
U.S. GSE residential mortgage-backed securities |  |
Amortized Cost, Held to maturity: |  |
Total | 6,822 | 8,142
Estimated Fair Value, Held to maturity: |  |
Estimated Fair Value | 7,051 | 8,093
U.S. GSE residential collateralized mortgage obligations |  |
Amortized Cost, Held to maturity: |  |
Total | 25,413 | 39,936
Estimated Fair Value, Held to maturity: |  |
Estimated Fair Value | 26,084 | 40,498
U.S. GSE commercial mortgage-backed securities |  |
Amortized Cost, Held to maturity: |  |
Total | 16,742 | 17,215
Estimated Fair Value, Held to maturity: |  |
Estimated Fair Value | 17,437 | 17,235
U.S. GSE commercial collateralized mortgage obligations |  |
Amortized Cost, Held to maturity: |  |
Total | 25,071 | 27,337
Estimated Fair Value, Held to maturity: |  |
Estimated Fair Value | $ 25,965 | $ 27,384

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