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INVESTMENT SECURITIES (Unrealized Losses on Investment Securities) (Details) - USD ($) | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Available-for-sale securities |  |
Less Than 12 Months, Fair Value | $ 190,672,000 | $ 284,181,000
Less Than 12 Months, Unrealized Losses | 1,520,000 | 1,433,000
12 Months Or Longer, Fair Value | 219,910,000 | 111,206,000
12 Months Or Longer, Unrealized Losses | 3,599,000 | 1,516,000
Total Fair Value | 410,582,000 | 395,387,000
Total Unrealized Losses | 5,119,000 | 2,949,000
Held-to-maturity debt securities |  |
Less Than 12 Months, Fair Value | 101,442,000 | 140,846,000
Less Than 12 Months, Unrealized Losses | 1,648,000 | 808,000
12 Months Or Longer, Fair Value | 85,085,000 | 45,155,000
12 Months Or Longer, Unrealized Losses | 2,951,000 | 886,000
Total Fair Value | 186,527,000 | 186,001,000
Total Unrealized Losses | 4,599,000 | 1,694,000
U.S. Government Treasury [Member] |  |
Available-for-sale securities |  |
Less Than 12 Months, Fair Value | 92,259,000 | 155,443,000
Less Than 12 Months, Unrealized Losses | 1,005,000 | 963,000
12 Months Or Longer, Fair Value | 175,854,000 | 79,900,000
12 Months Or Longer, Unrealized Losses | 3,217,000 | 1,201,000
Total Fair Value | 268,113,000 | 235,343,000
Total Unrealized Losses | 4,222,000 | 2,164,000
U.S. Government Agency [Member] |  |
Available-for-sale securities |  |
Less Than 12 Months, Fair Value | 63,475,000 | 45,737,000
Less Than 12 Months, Unrealized Losses | 351,000 | 150,000
12 Months Or Longer, Fair Value | 29,223,000 | 25,757,000
12 Months Or Longer, Unrealized Losses | 270,000 | 257,000
Total Fair Value | 92,698,000 | 71,494,000
Total Unrealized Losses | 621,000 | 407,000
States and Political Subdivisions [Member] |  |
Available-for-sale securities |  |
Less Than 12 Months, Fair Value | 34,928,000 | 82,999,000
Less Than 12 Months, Unrealized Losses | 164,000 | 320,000
12 Months Or Longer, Fair Value | 14,831,000 | 5,549,000
12 Months Or Longer, Unrealized Losses | 112,000 | 58,000
Total Fair Value | 49,759,000 | 88,548,000
Total Unrealized Losses | 276,000 | 378,000
Mortgage-Backed Securities [Member] |  |
Available-for-sale securities |  |
Less Than 12 Months, Fair Value | 10,000 | 2,000
Less Than 12 Months, Unrealized Losses | 0 | 0
12 Months Or Longer, Fair Value | 2,000 | 0
12 Months Or Longer, Unrealized Losses | 0 | 0
Total Fair Value | 12,000 | 2,000
Total Unrealized Losses | 0 | 0
U.S. Government Treasury [Member] |  |
Held-to-maturity debt securities |  |
Less Than 12 Months, Fair Value | 4,900,000 | 77,861,000
Less Than 12 Months, Unrealized Losses | 112,000 | 298,000
12 Months Or Longer, Fair Value | 29,501,000 | 14,939,000
12 Months Or Longer, Unrealized Losses | 590,000 | 143,000
Total Fair Value | 34,401,000 | 92,800,000
Total Unrealized Losses | 702,000 | 441,000
States and Political Subdivisions [Member] |  |
Held-to-maturity debt securities |  |
Less Than 12 Months, Fair Value | 6,026,000 | 6,955,000
Less Than 12 Months, Unrealized Losses | 38,000 | 41,000
12 Months Or Longer, Fair Value | 495,000 | 0
12 Months Or Longer, Unrealized Losses | 7,000 | 0
Total Fair Value | 6,521,000 | 6,955,000
Total Unrealized Losses | 45,000 | 41,000
Mortgage-Backed Securities [Member] |  |
Held-to-maturity debt securities |  |
Less Than 12 Months, Fair Value | 90,516,000 | 56,030,000
Less Than 12 Months, Unrealized Losses | 1,498,000 | 469,000
12 Months Or Longer, Fair Value | 55,089,000 | 30,216,000
12 Months Or Longer, Unrealized Losses | 2,354,000 | 743,000
Total Fair Value | 145,605,000 | 86,246,000
Total Unrealized Losses | $ 3,852,000 | $ 1,212,000

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