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SECURITIES (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Available for sale: |  |
Amortized Cost | $ 750,630 | $ 775,903
Gross Unrealized Gains | 58 | 306
Gross Unrealized Losses | (24,632) | (16,293)
Estimated Fair Value | 726,056 | 759,916
Held to maturity: |  |
Amortized Cost | 176,089 | 180,866
Gross Unrealized Gains | 723 | 1,293
Gross Unrealized Losses | (3,935) | (2,274)
Estimated Fair Value | 172,877 | 179,885
Total securities |  |
Amortized Cost | 926,719 | 956,769
Gross Unrealized Gains | 781 | 1,599
Gross Unrealized Losses | (28,567) | (18,567)
Total securities | 898,933 | 939,801
U.S. GSE securities |  |
Available for sale: |  |
Amortized Cost | 57,995 | 57,994
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (1,957) | (1,180)
Estimated Fair Value | 56,038 | 56,814
State and municipal obligations |  |
Available for sale: |  |
Amortized Cost | 86,127 | 87,582
Gross Unrealized Gains | 54 | 259
Gross Unrealized Losses | (1,335) | (819)
Estimated Fair Value | 84,846 | 87,022
Held to maturity: |  |
Amortized Cost | 58,511 | 60,762
Gross Unrealized Gains | 586 | 972
Gross Unrealized Losses | (260) | (64)
Estimated Fair Value | 58,837 | 61,670
U.S. GSE residential mortgage-backed securities |  |
Available for sale: |  |
Amortized Cost | 181,005 | 189,705
Gross Unrealized Gains | 4 | 29
Gross Unrealized Losses | (5,442) | (2,833)
Estimated Fair Value | 175,567 | 186,901
Held to maturity: |  |
Amortized Cost | 10,988 | 11,424
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (433) | (261)
Estimated Fair Value | 10,555 | 11,163
U.S. GSE residential collateralized mortgage obligations |  |
Available for sale: |  |
Amortized Cost | 300,907 | 314,390
Gross Unrealized Gains | 0 | 16
Gross Unrealized Losses | (10,233) | (7,016)
Estimated Fair Value | 290,674 | 307,390
Held to maturity: |  |
Amortized Cost | 52,603 | 54,250
Gross Unrealized Gains | 137 | 244
Gross Unrealized Losses | (1,153) | (666)
Estimated Fair Value | 51,587 | 53,828
U.S. GSE commercial mortgage-backed securities |  |
Available for sale: |  |
Amortized Cost | 5,976 | 6,017
Gross Unrealized Gains | 0 | 2
Gross Unrealized Losses | (120) | (40)
Estimated Fair Value | 5,856 | 5,979
Held to maturity: |  |
Amortized Cost | 22,751 | 22,953
Gross Unrealized Gains | 0 | 77
Gross Unrealized Losses | (719) | (438)
Estimated Fair Value | 22,032 | 22,592
U.S. GSE commercial collateralized mortgage obligations |  |
Available for sale: |  |
Amortized Cost | 48,370 | 49,965
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (1,878) | (1,249)
Estimated Fair Value | 46,492 | 48,716
Held to maturity: |  |
Amortized Cost | 31,236 | 31,477
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (1,370) | (845)
Estimated Fair Value | 29,866 | 30,632
Other asset backed securities |  |
Available for sale: |  |
Amortized Cost | 24,250 | 24,250
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (849) | (849)
Estimated Fair Value | 23,401 | 23,401
Corporate bonds |  |
Available for sale: |  |
Amortized Cost | 46,000 | 46,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (2,818) | (2,307)
Estimated Fair Value | $ 43,182 | $ 43,693

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