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SECURITIES - Summary of Held to Maturity Investment Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Held to maturity: |  |
Amortized Cost | $ 144,716 | $ 160,163
Gross Unrealized Gains | 1,825 | 457
Gross Unrealized Losses | (1,061) | (3,828)
Estimated Fair Value | 145,480 | 156,792
State and municipal obligations |  |
Held to maturity: |  |
Amortized Cost | 42,582 | 53,540
Gross Unrealized Gains | 927 | 290
Gross Unrealized Losses | (1) | (276)
Estimated Fair Value | 43,508 | 53,554
U.S. GSE residential mortgage-backed securities |  |
Held to maturity: |  |
Amortized Cost | 8,900 | 9,688
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (109) | (336)
Estimated Fair Value | 8,791 | 9,352
U.S. GSE residential collateralized mortgage obligations |  |
Held to maturity: |  |
Amortized Cost | 45,961 | 48,244
Gross Unrealized Gains | 655 | 163
Gross Unrealized Losses | (315) | (1,130)
Estimated Fair Value | 46,301 | 47,277
U.S. GSE commercial mortgage-backed securities |  |
Held to maturity: |  |
Amortized Cost | 18,721 | 19,098
Gross Unrealized Gains | 125 | 4
Gross Unrealized Losses | (70) | (620)
Estimated Fair Value | 18,776 | 18,482
U.S. GSE commercial collateralized mortgage obligations |  |
Held to maturity: |  |
Amortized Cost | 28,552 | 29,593
Gross Unrealized Gains | 118 | 0
Gross Unrealized Losses | (566) | (1,466)
Estimated Fair Value | $ 28,104 | $ 28,127

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