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SECURITIES - Summary of Held to Maturity Investment Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Held to maturity: |  |
Amortized Cost | $ 100,934 | $ 133,638
Gross Unrealized Gains | 3,986 | 1,731
Gross Unrealized Losses | (9) | (342)
Estimated Fair Value | 104,911 | 135,027
State and municipal obligations |  |
Held to maturity: |  |
Amortized Cost | 26,886 | 41,008
Gross Unrealized Gains | 1,497 | 809
Gross Unrealized Losses | (9) |
Estimated Fair Value | 28,374 | 41,817
U.S. GSE residential mortgage-backed securities |  |
Held to maturity: |  |
Amortized Cost | 6,822 | 8,142
Gross Unrealized Gains | 229 | 5
Gross Unrealized Losses |  | (54)
Estimated Fair Value | 7,051 | 8,093
U.S. GSE residential collateralized mortgage obligations |  |
Held to maturity: |  |
Amortized Cost | 25,413 | 39,936
Gross Unrealized Gains | 671 | 624
Gross Unrealized Losses |  | (62)
Estimated Fair Value | 26,084 | 40,498
U.S. GSE commercial mortgage-backed securities |  |
Held to maturity: |  |
Amortized Cost | 16,742 | 17,215
Gross Unrealized Gains | 695 | 102
Gross Unrealized Losses |  | (82)
Estimated Fair Value | 17,437 | 17,235
U.S. GSE commercial collateralized mortgage obligations |  |
Held to maturity: |  |
Amortized Cost | 25,071 | 27,337
Gross Unrealized Gains | 894 | 191
Gross Unrealized Losses |  | (144)
Estimated Fair Value | $ 25,965 | $ 27,384

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