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SECURITIES: (Details) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Amortized cost and fair value of investments classified as available for sale |  |
TOTAL | $ 876,796 | $ 880,946
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 21,005 | 24,296
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 6,719 | 8,189
Securities available-for-sale | 891,082 | 897,053
U.S. Government entity mortgage-backed securities |  |
Amortized cost and fair value of investments classified as available for sale |  |
TOTAL | 10,670 | 1,411
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 46 | 56
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 23 | 0
Securities available-for-sale | 10,693 | 1,467
Mortgage-backed securities, residential |  |
Amortized cost and fair value of investments classified as available for sale |  |
TOTAL | 208,705 | 180,673
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 5,089 | 7,593
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 630 | 330
Securities available-for-sale | 213,164 | 187,936
Mortgage-backed securities, commercial |  |
Amortized cost and fair value of investments classified as available for sale |  |
TOTAL | 9 | 17
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 0 | 0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0 | 0
Securities available-for-sale | 9 | 17
Collateralized mortgage obligations |  |
Amortized cost and fair value of investments classified as available for sale |  |
TOTAL | 441,500 | 489,765
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 2,141 | 2,513
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 6,007 | 7,623
Securities available-for-sale | 437,634 | 484,655
State and municipal obligations |  |
Amortized cost and fair value of investments classified as available for sale |  |
TOTAL | 206,291 | 198,875
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 8,475 | 9,019
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 59 | 219
Securities available-for-sale | 214,707 | 207,675
Collateralized debt obligations |  |
Amortized cost and fair value of investments classified as available for sale |  |
TOTAL | 9,621 | 10,205
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax | 5,254 | 5,115
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax | 0 | 17
Securities available-for-sale | $ 14,875 | $ 15,303

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