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INVESTMENT SECURITIES (Details 3) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Available-for-sale securities |  |
Less Than 12 Months, Market Value | $ 89,910 | $ 284,181
Less Than 12 Months, Unrealized Losses | 363 | 1,433
Greater Than 12 Months, Market Value | 253,653 | 111,206
Greater Than 12 Months, Unrealized Losses | 2,912 | 1,516
Total Market Value | 343,563 | 395,387
Total Unrealized Losses | 3,275 | 2,949
Held-to-maturity debt securities |  |
Less Than 12 Months, Market Value | 51,531 | 140,846
Less Than 12 Months, Unrealized Losses | 389 | 808
Greater Than 12 Months, Market Value | 125,598 | 45,155
Greater Than 12 Months Or Longer, Unrealized Losses | 2,738 | 886
Total Market Value | 177,129 | 186,001
Total Unrealized Losses | 3,127 | 1,694
U.S. Treasury [Member] |  |
Available-for-sale securities |  |
Less Than 12 Months, Market Value | 28,420 | 155,443
Less Than 12 Months, Unrealized Losses | 80 | 963
Greater Than 12 Months, Market Value | 193,501 | 79,900
Greater Than 12 Months, Unrealized Losses | 2,536 | 1,201
Total Market Value | 221,921 | 235,343
Total Unrealized Losses | 2,616 | 2,164
Held-to-maturity debt securities |  |
Less Than 12 Months, Market Value | 0 | 77,861
Less Than 12 Months, Unrealized Losses | 0 | 298
Greater Than 12 Months, Market Value | 34,612 | 14,939
Greater Than 12 Months Or Longer, Unrealized Losses | 477 | 143
Total Market Value | 34,612 | 92,800
Total Unrealized Losses | 477 | 441
U.S. Government Agency [Member] |  |
Available-for-sale securities |  |
Less Than 12 Months, Market Value | 53,237 | 45,737
Less Than 12 Months, Unrealized Losses | 271 | 150
Greater Than 12 Months, Market Value | 28,735 | 25,757
Greater Than 12 Months, Unrealized Losses | 244 | 257
Total Market Value | 81,972 | 71,494
Total Unrealized Losses | 515 | 407
Held-to-maturity debt securities |  |
Less Than 12 Months, Market Value | 0 | 0
Less Than 12 Months, Unrealized Losses | 0 | 0
Greater Than 12 Months, Market Value | 0 | 0
Greater Than 12 Months Or Longer, Unrealized Losses | 0 | 0
Total Market Value | 0 | 0
Total Unrealized Losses | 0 | 0
States and Political Subdivisions [Member] |  |
Available-for-sale securities |  |
Less Than 12 Months, Market Value | 8,243 | 82,999
Less Than 12 Months, Unrealized Losses | 12 | 320
Greater Than 12 Months, Market Value | 31,417 | 5,549
Greater Than 12 Months, Unrealized Losses | 132 | 58
Total Market Value | 39,660 | 88,548
Total Unrealized Losses | 144 | 378
Held-to-maturity debt securities |  |
Less Than 12 Months, Market Value | 204 | 6,955
Less Than 12 Months, Unrealized Losses | 0 | 41
Greater Than 12 Months, Market Value | 6,281 | 0
Greater Than 12 Months Or Longer, Unrealized Losses | 26 | 0
Total Market Value | 6,485 | 6,955
Total Unrealized Losses | 26 | 41
Mortgage-Backed Securities [Member] |  |
Available-for-sale securities |  |
Less Than 12 Months, Market Value | 10 | 2
Less Than 12 Months, Unrealized Losses | 0 | 0
Greater Than 12 Months, Market Value | 0 | 0
Greater Than 12 Months, Unrealized Losses | 0 | 0
Total Market Value | 10 | 2
Total Unrealized Losses | 0 | 0
Held-to-maturity debt securities |  |
Less Than 12 Months, Market Value | 51,327 | 56,030
Less Than 12 Months, Unrealized Losses | 389 | 469
Greater Than 12 Months, Market Value | 84,705 | 30,216
Greater Than 12 Months Or Longer, Unrealized Losses | 2,235 | 743
Total Market Value | 136,032 | 86,246
Total Unrealized Losses | $ 2,624 | $ 1,212

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