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INVESTMENT SECURITIES (Details 3) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Available-for-sale securities |  |
Less Than 12 Months, Market Value | $ 284,181 | $ 246,748
Less Than 12 Months, Unrealized Losses | 1,433 | 1,541
Greater Than 12 Months, Market Value | 111,206 | 6,993
Greater Than 12 Months, Unrealized Losses | 1,516 | 35
Total Market Value | 395,387 | 253,741
Total Unrealized Losses | 2,949 | 1,576
Held-to-maturity debt securities |  |
Less Than 12 Months, Market Value | 140,846 | 79,411
Less Than 12 Months, Unrealized Losses | 808 | 718
Greater Than 12 Months, Market Value | 45,155 | 4,010
Greater Than 12 Months Or Longer, Unrealized Losses | 886 | 38
Total Market Value | 186,001 | 83,421
Total Unrealized Losses | 1,694 | 756
U.S. Treasury [Member] |  |
Available-for-sale securities |  |
Less Than 12 Months, Market Value | 155,443 | 116,704
Less Than 12 Months, Unrealized Losses | 963 | 851
Greater Than 12 Months, Market Value | 79,900 | 0
Greater Than 12 Months, Unrealized Losses | 1,201 | 0
Total Market Value | 235,343 | 116,704
Total Unrealized Losses | 2,164 | 851
U.S. Government Agency [Member] |  |
Available-for-sale securities |  |
Less Than 12 Months, Market Value | 45,737 | 48,520
Less Than 12 Months, Unrealized Losses | 150 | 310
Greater Than 12 Months, Market Value | 25,757 | 6,699
Greater Than 12 Months, Unrealized Losses | 257 | 34
Total Market Value | 71,494 | 55,219
Total Unrealized Losses | 407 | 344
States and Political Subdivisions [Member] |  |
Available-for-sale securities |  |
Less Than 12 Months, Market Value | 82,999 | 81,521
Less Than 12 Months, Unrealized Losses | 320 | 380
Greater Than 12 Months, Market Value | 5,549 | 294
Greater Than 12 Months, Unrealized Losses | 58 | 1
Total Market Value | 88,548 | 81,815
Total Unrealized Losses | 378 | 381
Mortgage-Backed Securities [Member] |  |
Available-for-sale securities |  |
Less Than 12 Months, Market Value | 2 | 3
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 | 2 | 3
Total Unrealized Losses | 0 | 0
U.S. Treasury [Member] |  |
Held-to-maturity debt securities |  |
Less Than 12 Months, Market Value | 77,861 | 35,210
Less Than 12 Months, Unrealized Losses | 298 | 81
Greater Than 12 Months, Market Value | 14,939 | 0
Greater Than 12 Months Or Longer, Unrealized Losses | 143 | 0
Total Market Value | 92,800 | 35,210
Total Unrealized Losses | 441 | 81
U.S. Government Agency [Member] |  |
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] |  |
Held-to-maturity debt securities |  |
Less Than 12 Months, Market Value | 6,955 | 7,491
Less Than 12 Months, Unrealized Losses | 41 | 38
Greater Than 12 Months, Market Value | 0 | 0
Greater Than 12 Months Or Longer, Unrealized Losses | 0 | 0
Total Market Value | 6,955 | 7,491
Total Unrealized Losses | 41 | 38
Mortgage-Backed Securities [Member] |  |
Held-to-maturity debt securities |  |
Less Than 12 Months, Market Value | 56,030 | 36,710
Less Than 12 Months, Unrealized Losses | 469 | 599
Greater Than 12 Months, Market Value | 30,216 | 4,010
Greater Than 12 Months Or Longer, Unrealized Losses | 743 | 38
Total Market Value | 86,246 | 40,720
Total Unrealized Losses | $ 1,212 | $ 637

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