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SECURITIES - Summary of Available for Sale Investment Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Available for sale: |  |
Amortized Cost | $ 548,621 | $ 639,463
Gross Unrealized Gains | 10,557 | 4,225
Gross Unrealized Losses | (5,900) | (5,397)
Estimated Fair Value | 553,278 | 638,291
U.S. Treasury securities |  |
Available for sale: |  |
Amortized Cost | 59,980 | 50,833
Gross Unrealized Gains | 19 |
Gross Unrealized Losses |  | (11)
Estimated Fair Value | 59,999 | 50,822
U.S. GSE securities |  |
Available for sale: |  |
Amortized Cost |  | 5,000
Gross Unrealized Losses |  | (5)
Estimated Fair Value |  | 4,995
State and municipal obligations |  |
Available for sale: |  |
Amortized Cost | 37,233 | 34,303
Gross Unrealized Gains | 805 | 704
Gross Unrealized Losses | (92) | (43)
Estimated Fair Value | 37,946 | 34,964
U.S. GSE residential mortgage-backed securities |  |
Available for sale: |  |
Amortized Cost | 80,136 | 84,550
Gross Unrealized Gains | 1,756 | 609
Gross Unrealized Losses | (238) | (468)
Estimated Fair Value | 81,654 | 84,691
U.S. GSE residential collateralized mortgage obligations |  |
Available for sale: |  |
Amortized Cost | 200,029 | 278,149
Gross Unrealized Gains | 5,463 | 1,166
Gross Unrealized Losses |  | (1,464)
Estimated Fair Value | 205,492 | 277,851
U.S. GSE commercial mortgage-backed securities |  |
Available for sale: |  |
Amortized Cost | 16,683 | 13,656
Gross Unrealized Gains | 366 | 23
Gross Unrealized Losses | 0 | (70)
Estimated Fair Value | 17,049 | 13,609
U.S. GSE commercial collateralized mortgage obligations |  |
Available for sale: |  |
Amortized Cost | 81,310 | 102,722
Gross Unrealized Gains | 2,148 | 1,723
Gross Unrealized Losses | (78) | (289)
Estimated Fair Value | 83,380 | 104,156
Other asset backed securities |  |
Available for sale: |  |
Amortized Cost | 24,250 | 24,250
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (1,698) | (849)
Estimated Fair Value | 22,552 | 23,401
Corporate bonds |  |
Available for sale: |  |
Amortized Cost | 49,000 | 46,000
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | (3,794) | (2,198)
Estimated Fair Value | $ 45,206 | $ 43,802

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