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INVESTMENT SECURITIES (Details) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
--- | --- | ---
Held to Maturity |  |
Amortized Cost | $ 242,141 | $ 252,047
Estimated Fair Value | 235,929 | 238,705
Available for Sale |  |
Amortized Cost | 1,179,649 | 1,433,296
Gross Unrealized Gains | 15,481 | 9,469
Gross Unrealized Losses | (10,566) | (34,766)
Total | 1,184,564 | 1,407,999
States and political subdivisions debt securities |  |
Available for Sale |  |
Amortized Cost | 191,553 | 191,158
Gross Unrealized Gains | 1,844 | 305
Gross Unrealized Losses | (3,238) | (12,106)
Total | 190,159 | 179,357
Corporations debt securities |  |
Available for Sale |  |
Amortized Cost | 84,331 | 157,337
Gross Unrealized Gains | 1,427 | 1,878
Gross Unrealized Losses | (206) | (1,120)
Total | 85,552 | 158,095
U.S. Government sponsored entities mortgage-backed securities |  |
Held to Maturity |  |
Amortized Cost | 242,141 | 252,047
Gross Unrealized Gains | 63 |
Gross Unrealized Losses | (6,275) | (13,342)
Estimated Fair Value | 235,929 | 238,705
Available for Sale |  |
Amortized Cost | 737,504 | 936,144
Gross Unrealized Gains | 8,780 | 7,085
Gross Unrealized Losses | (5,745) | (15,603)
Total | 740,539 | 927,626
Non-agency collateralized mortgage obligations mortgage-backed securities |  |
Available for Sale |  |
Amortized Cost | 165,518 | 147,902
Gross Unrealized Gains | 3,320 | 81
Gross Unrealized Losses | (1,377) | (5,937)
Total | 167,461 | 142,046
Other |  |
Available for Sale |  |
Amortized Cost | 743 | 755
Gross Unrealized Gains | 110 | 120
Total | $ 853 | $ 875

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