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SECURITIES - Summary of Held to Maturity Investment Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Held to maturity: |  |
Amortized Cost | $ 133,638 | $ 160,163
Gross Unrealized Gains | 1,731 | 457
Gross Unrealized Losses | (342) | (3,828)
Estimated Fair Value | 135,027 | 156,792
State and municipal obligations |  |
Held to maturity: |  |
Amortized Cost | 41,008 | 53,540
Gross Unrealized Gains | 809 | 290
Gross Unrealized Losses | 0 | (276)
Estimated Fair Value | 41,817 | 53,554
U.S. GSE residential mortgage-backed securities |  |
Held to maturity: |  |
Amortized Cost | 8,142 | 9,688
Gross Unrealized Gains | 5 | 0
Gross Unrealized Losses | (54) | (336)
Estimated Fair Value | 8,093 | 9,352
U.S. GSE residential collateralized mortgage obligations |  |
Held to maturity: |  |
Amortized Cost | 39,936 | 48,244
Gross Unrealized Gains | 624 | 163
Gross Unrealized Losses | (62) | (1,130)
Estimated Fair Value | 40,498 | 47,277
U.S. GSE commercial mortgage-backed securities |  |
Held to maturity: |  |
Amortized Cost | 17,215 | 19,098
Gross Unrealized Gains | 102 | 4
Gross Unrealized Losses | (82) | (620)
Estimated Fair Value | 17,235 | 18,482
U.S. GSE commercial collateralized mortgage obligations |  |
Held to maturity: |  |
Amortized Cost | 27,337 | 29,593
Gross Unrealized Gains | 191 | 0
Gross Unrealized Losses | (144) | (1,466)
Estimated Fair Value | $ 27,384 | $ 28,127

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