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SECURITIES - Summary of Available for Sale Investment Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Available for sale: |  |
Amortized Cost | $ 645,573 | $ 697,381
Gross Unrealized Gains | 3,881 | 969
Gross Unrealized Losses | (6,557) | (17,464)
Estimated Fair Value | 642,897 | 680,886
U.S. GSE securities |  |
Available for sale: |  |
Amortized Cost | 15,000 | 29,997
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (37) | (947)
Estimated Fair Value | 14,963 | 29,050
State and municipal obligations |  |
Available for sale: |  |
Amortized Cost | 28,108 | 40,980
Gross Unrealized Gains | 641 | 105
Gross Unrealized Losses | (1) | (354)
Estimated Fair Value | 28,748 | 40,731
U.S. GSE residential mortgage-backed securities |  |
Available for sale: |  |
Amortized Cost | 93,898 | 96,536
Gross Unrealized Gains | 268 | 38
Gross Unrealized Losses | (909) | (3,036)
Estimated Fair Value | 93,257 | 93,538
U.S. GSE residential collateralized mortgage obligations |  |
Available for sale: |  |
Amortized Cost | 333,584 | 362,905
Gross Unrealized Gains | 1,628 | 826
Gross Unrealized Losses | (1,428) | (5,954)
Estimated Fair Value | 333,784 | 357,777
U.S. GSE commercial mortgage-backed securities |  |
Available for sale: |  |
Amortized Cost | 7,013 | 3,536
Gross Unrealized Gains | 38 | 0
Gross Unrealized Losses | 0 | (28)
Estimated Fair Value | 7,051 | 3,508
U.S. GSE commercial collateralized mortgage obligations |  |
Available for sale: |  |
Amortized Cost | 97,720 | 93,177
Gross Unrealized Gains | 1,306 | 0
Gross Unrealized Losses | (629) | (2,539)
Estimated Fair Value | 98,397 | 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 | (2,765) | (3,575)
Estimated Fair Value | $ 43,235 | $ 42,425

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