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SECURITIES - Summary of Available for Sale Investment Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Available for sale: |  |
Amortized Cost | $ 611,155 | $ 697,381
Gross Unrealized Gains | 5,350 | 969
Gross Unrealized Losses | (5,799) | (17,464)
Estimated Fair Value | 610,706 | 680,886
U.S. GSE securities |  |
Available for sale: |  |
Amortized Cost | 5,000 | 29,997
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (13) | (947)
Estimated Fair Value | 4,987 | 29,050
State and municipal obligations |  |
Available for sale: |  |
Amortized Cost | 29,587 | 40,980
Gross Unrealized Gains | 813 | 105
Gross Unrealized Losses |  | (354)
Estimated Fair Value | 30,400 | 40,731
U.S. GSE residential mortgage-backed securities |  |
Available for sale: |  |
Amortized Cost | 89,104 | 96,536
Gross Unrealized Gains | 530 | 38
Gross Unrealized Losses | (558) | (3,036)
Estimated Fair Value | 89,076 | 93,538
U.S. GSE residential collateralized mortgage obligations |  |
Available for sale: |  |
Amortized Cost | 309,146 | 362,905
Gross Unrealized Gains | 1,688 | 826
Gross Unrealized Losses | (1,643) | (5,954)
Estimated Fair Value | 309,191 | 357,777
U.S. GSE commercial mortgage-backed securities |  |
Available for sale: |  |
Amortized Cost | 11,867 | 3,536
Gross Unrealized Gains | 34 | 0
Gross Unrealized Losses | (16) | (28)
Estimated Fair Value | 11,885 | 3,508
U.S. GSE commercial collateralized mortgage obligations |  |
Available for sale: |  |
Amortized Cost | 96,201 | 93,177
Gross Unrealized Gains | 2,285 | 0
Gross Unrealized Losses | (133) | (2,539)
Estimated Fair Value | 98,353 | 90,638
Other asset backed securities |  |
Available for sale: |  |
Amortized Cost | 24,250 | 24,250
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (788) | (1,031)
Estimated Fair Value | 23,462 | 23,219
Corporate bonds |  |
Available for sale: |  |
Amortized Cost | 46,000 | 46,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (2,648) | (3,575)
Estimated Fair Value | $ 43,352 | $ 42,425

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