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INVESTMENT SECURITIES (Details 3) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2016 | Dec. 31, 2015
Available-for-sale securities |  |
Less Than 12 Months, Fair Value | $ 33,376 | $ 233,177
Less Than 12 Months, Unrealized Losses | 72 | 499
12 Months Or Longer, Fair Value | 12,667 | 14,710
12 Months Or Longer, Unrealized Losses | 66 | 76
Total Fair Value | 46,043 | 247,887
Total Unrealized Losses | 138 | 575
Held-to-maturity debt securities |  |
Less Than 12 Months, Fair Value | 7,669 | 114,403
Less Than 12 Months, Unrealized Losses | 20 | 357
12 Months Or Longer, Fair Value | 11,630 | 11,889
12 Months Or Longer, Unrealized Losses | 176 | 222
Total Fair Value | 19,299 | 126,292
Total Unrealized Losses | 196 | 579
U.S. Government Treasury [Member] |  |
Available-for-sale securities |  |
Less Than 12 Months, Fair Value | 7,497 | 150,061
Less Than 12 Months, Unrealized Losses | $ 1 | $ 213
12 Months Or Longer, Fair Value |  |
12 Months Or Longer, Unrealized Losses |  |
Total Fair Value | $ 7,497 | $ 150,061
Total Unrealized Losses | 1 | 213
Held-to-maturity debt securities |  |
Less Than 12 Months, Fair Value |  | 92,339
Less Than 12 Months, Unrealized Losses |  | $ 160
12 Months Or Longer, Fair Value |  |
12 Months Or Longer, Unrealized Losses |  |
Total Fair Value |  | $ 92,339
Total Unrealized Losses |  | 160
U.S. Government Agency [Member] |  |
Available-for-sale securities |  |
Less Than 12 Months, Fair Value | 15,142 | 43,508
Less Than 12 Months, Unrealized Losses | 60 | 200
12 Months Or Longer, Fair Value | 12,362 | 9,644
12 Months Or Longer, Unrealized Losses | 65 | 63
Total Fair Value | 27,504 | 53,152
Total Unrealized Losses | 125 | 263
Held-to-maturity debt securities |  |
Less Than 12 Months, Fair Value | $ 1,913 | 5,006
Less Than 12 Months, Unrealized Losses |  | $ 5
12 Months Or Longer, Fair Value |  |
12 Months Or Longer, Unrealized Losses |  |
Total Fair Value | $ 1,913 | $ 5,006
Total Unrealized Losses |  | 5
States and Political Subdivisions [Member] |  |
Available-for-sale securities |  |
Less Than 12 Months, Fair Value | $ 10,733 | 39,608
Less Than 12 Months, Unrealized Losses | 11 | 86
12 Months Or Longer, Fair Value | 305 | 5,066
12 Months Or Longer, Unrealized Losses | 1 | 13
Total Fair Value | 11,038 | 44,674
Total Unrealized Losses | 12 | 99
Held-to-maturity debt securities |  |
Less Than 12 Months, Fair Value | 1,724 | 3,791
Less Than 12 Months, Unrealized Losses | $ 1 | $ 7
12 Months Or Longer, Fair Value |  |
12 Months Or Longer, Unrealized Losses |  |
Total Fair Value | $ 1,724 | $ 3,791
Total Unrealized Losses | 1 | 7
Mortgage-Backed Securities [Member] |  |
Available-for-sale securities |  |
Less Than 12 Months, Fair Value | $ 4 |
Less Than 12 Months, Unrealized Losses |  |
12 Months Or Longer, Fair Value |  |
12 Months Or Longer, Unrealized Losses |  |
Total Fair Value | $ 4 |
Total Unrealized Losses |  |
Held-to-maturity debt securities |  |
Less Than 12 Months, Fair Value | $ 4,032 | 13,267
Less Than 12 Months, Unrealized Losses | 19 | 185
12 Months Or Longer, Fair Value | 11,630 | 11,889
12 Months Or Longer, Unrealized Losses | 176 | 222
Total Fair Value | 15,662 | 25,156
Total Unrealized Losses | $ 195 | $ 407

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