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SECURITIES - Summary of Held to Maturity Investment Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Held to maturity: |  |
Amortized Cost | $ 124,231 | $ 133,638
Gross Unrealized Gains | 3,432 | 1,731
Gross Unrealized Losses | (10) | (342)
Estimated Fair Value | 127,653 | 135,027
State and municipal obligations |  |
Held to maturity: |  |
Amortized Cost | 34,046 | 41,008
Gross Unrealized Gains | 807 | 809
Estimated Fair Value | 34,853 | 41,817
U.S. GSE residential mortgage-backed securities |  |
Held to maturity: |  |
Amortized Cost | 7,737 | 8,142
Gross Unrealized Gains | 141 | 5
Gross Unrealized Losses |  | (54)
Estimated Fair Value | 7,878 | 8,093
U.S. GSE residential collateralized mortgage obligations |  |
Held to maturity: |  |
Amortized Cost | 38,076 | 39,936
Gross Unrealized Gains | 1,610 | 624
Gross Unrealized Losses |  | (62)
Estimated Fair Value | 39,686 | 40,498
U.S. GSE commercial mortgage-backed securities |  |
Held to maturity: |  |
Amortized Cost | 17,021 | 17,215
Gross Unrealized Gains | 503 | 102
Gross Unrealized Losses |  | (82)
Estimated Fair Value | 17,524 | 17,235
U.S. GSE commercial collateralized mortgage obligations |  |
Held to maturity: |  |
Amortized Cost | 27,351 | 27,337
Gross Unrealized Gains | 371 | 191
Gross Unrealized Losses | (10) | (144)
Estimated Fair Value | $ 27,712 | $ 27,384

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