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SECURITIES - Summary of Available for Sale Investment Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Available for sale: |  |
Amortized Cost | $ 639,463 | $ 697,381
Gross Unrealized Gains | 4,225 | 969
Gross Unrealized Losses | (5,397) | (17,464)
Estimated Fair Value | 638,291 | 680,886
U.S. Treasury securities |  |
Available for sale: |  |
Amortized Cost | 50,833 |
Gross Unrealized Losses | (11) |
Estimated Fair Value | 50,822 |
U.S. GSE securities |  |
Available for sale: |  |
Amortized Cost | 5,000 | 29,997
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (5) | (947)
Estimated Fair Value | 4,995 | 29,050
State and municipal obligations |  |
Available for sale: |  |
Amortized Cost | 34,303 | 40,980
Gross Unrealized Gains | 704 | 105
Gross Unrealized Losses | (43) | (354)
Estimated Fair Value | 34,964 | 40,731
U.S. GSE residential mortgage-backed securities |  |
Available for sale: |  |
Amortized Cost | 84,550 | 96,536
Gross Unrealized Gains | 609 | 38
Gross Unrealized Losses | (468) | (3,036)
Estimated Fair Value | 84,691 | 93,538
U.S. GSE residential collateralized mortgage obligations |  |
Available for sale: |  |
Amortized Cost | 278,149 | 362,905
Gross Unrealized Gains | 1,166 | 826
Gross Unrealized Losses | (1,464) | (5,954)
Estimated Fair Value | 277,851 | 357,777
U.S. GSE commercial mortgage-backed securities |  |
Available for sale: |  |
Amortized Cost | 13,656 | 3,536
Gross Unrealized Gains | 23 | 0
Gross Unrealized Losses | (70) | (28)
Estimated Fair Value | 13,609 | 3,508
U.S. GSE commercial collateralized mortgage obligations |  |
Available for sale: |  |
Amortized Cost | 102,722 | 93,177
Gross Unrealized Gains | 1,723 | 0
Gross Unrealized Losses | (289) | (2,539)
Estimated Fair Value | 104,156 | 90,638
Other asset backed securities |  |
Available for sale: |  |
Amortized Cost | 24,250 | 24,250
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (849) | (1,031)
Estimated Fair Value | 23,401 | 23,219
Corporate bonds |  |
Available for sale: |  |
Amortized Cost | 46,000 | 46,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (2,198) | (3,575)
Estimated Fair Value | $ 43,802 | $ 42,425

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