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SECURITIES (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Available for sale: |  |
Amortized Cost | $ 775,903 | $ 834,564
Gross Unrealized Gains | 306 | 383
Gross Unrealized Losses | (16,293) | (15,225)
Estimated Fair Value | 759,916 | 819,722
Held to maturity: |  |
Held-to-maturity Securities | 180,866 | 223,237
Gross Unrealized Gains | 1,293 | 1,692
Gross Unrealized Losses | (2,274) | (2,051)
Estimated Fair Value | 179,885 | 222,878
Total securities |  |
Amortized Cost | 956,769 | 1,057,801
Gross Unrealized Gains | 1,599 | 2,075
Gross Unrealized Losses | (18,567) | (17,276)
Investments, Fair Value Disclosure | 939,801 | 1,042,600
U.S. GSE securities |  |
Available for sale: |  |
Amortized Cost | 57,994 | 64,993
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (1,180) | (1,344)
Estimated Fair Value | 56,814 | 63,649
State and municipal obligations |  |
Available for sale: |  |
Amortized Cost | 87,582 | 117,292
Gross Unrealized Gains | 259 | 212
Gross Unrealized Losses | (819) | (1,339)
Estimated Fair Value | 87,022 | 116,165
Held to maturity: |  |
Held-to-maturity Securities | 60,762 | 66,666
Gross Unrealized Gains | 972 | 1,085
Gross Unrealized Losses | (64) | (130)
Estimated Fair Value | 61,670 | 67,621
U.S. GSE residential mortgage-backed securities |  |
Available for sale: |  |
Amortized Cost | 189,705 | 160,446
Gross Unrealized Gains | 29 | 16
Gross Unrealized Losses | (2,833) | (2,414)
Estimated Fair Value | 186,901 | 158,048
Held to maturity: |  |
Held-to-maturity Securities | 11,424 | 13,443
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (261) | (287)
Estimated Fair Value | 11,163 | 13,156
U.S. GSE residential collateralized mortgage Obligations |  |
Available for sale: |  |
Amortized Cost | 314,390 | 373,098
Gross Unrealized Gains | 16 | 149
Gross Unrealized Losses | (7,016) | (5,736)
Estimated Fair Value | 307,390 | 367,511
Held to maturity: |  |
Held-to-maturity Securities | 54,250 | 61,639
Gross Unrealized Gains | 244 | 352
Gross Unrealized Losses | (666) | (552)
Estimated Fair Value | 53,828 | 61,439
U.S. GSE commercial mortgage-backed securities |  |
Available for sale: |  |
Amortized Cost | 6,017 | 6,337
Gross Unrealized Gains | 2 | 6
Gross Unrealized Losses | (40) | (36)
Estimated Fair Value | 5,979 | 6,307
Held to maturity: |  |
Held-to-maturity Securities | 22,953 | 28,772
Gross Unrealized Gains | 77 | 136
Gross Unrealized Losses | (438) | (509)
Estimated Fair Value | 22,592 | 28,399
U.S. GSE commercial collateralized mortgage Obligations |  |
Available for sale: |  |
Amortized Cost | 49,965 | 56,148
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (1,249) | (956)
Estimated Fair Value | 48,716 | 55,192
Held to maturity: |  |
Held-to-maturity Securities | 31,477 | 41,717
Gross Unrealized Gains | 0 | 93
Gross Unrealized Losses | (845) | (573)
Estimated Fair Value | 30,632 | 41,237
Other asset backed securities |  |
Available for sale: |  |
Amortized Cost | 24,250 | 24,250
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (849) | (1,697)
Estimated Fair Value | 23,401 | 22,553
Corporate bonds |  |
Available for sale: |  |
Amortized Cost | 46,000 | 32,000
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (2,307) | (1,703)
Estimated Fair Value | 43,693 | 30,297
Held to maturity: |  |
Held-to-maturity Securities | 0 | 11,000
Gross Unrealized Gains | 0 | 26
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | $ 0 | $ 11,026

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