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INVESTMENT SECURITIES (Unrealized Losses on Investment Securities) (Details) - USD ($) | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Available-for-sale securities |  |
Less Than 12 Months, Fair Value | $ 268,590,000 | $ 284,181,000
Less Than 12 Months, Unrealized Losses | 2,680,000 | 1,433,000
12 Months Or Longer, Fair Value | 127,677,000 | 111,206,000
12 Months Or Longer, Unrealized Losses | 1,936,000 | 1,516,000
Total Fair Value | 396,267,000 | 395,387,000
Total Unrealized Losses | 4,616,000 | 2,949,000
Held-to-maturity debt securities |  |
Less Than 12 Months, Fair Value | 138,990,000 | 140,846,000
Less Than 12 Months, Unrealized Losses | 2,256,000 | 808,000
12 Months Or Longer, Fair Value | 55,272,000 | 45,155,000
12 Months Or Longer, Unrealized Losses | 1,494,000 | 886,000
Total Fair Value | 194,262,000 | 186,001,000
Total Unrealized Losses | 3,750,000 | 1,694,000
U.S. Government Treasury [Member] |  |
Available-for-sale securities |  |
Less Than 12 Months, Fair Value | 146,449,000 | 155,443,000
Less Than 12 Months, Unrealized Losses | 2,127,000 | 963,000
12 Months Or Longer, Fair Value | 97,386,000 | 79,900,000
12 Months Or Longer, Unrealized Losses | 1,618,000 | 1,201,000
Total Fair Value | 243,835,000 | 235,343,000
Total Unrealized Losses | 3,745,000 | 2,164,000
U.S. Government Agency [Member] |  |
Available-for-sale securities |  |
Less Than 12 Months, Fair Value | 67,628,000 | 45,737,000
Less Than 12 Months, Unrealized Losses | 377,000 | 150,000
12 Months Or Longer, Fair Value | 25,212,000 | 25,757,000
12 Months Or Longer, Unrealized Losses | 276,000 | 257,000
Total Fair Value | 92,840,000 | 71,494,000
Total Unrealized Losses | 653,000 | 407,000
States and Political Subdivisions [Member] |  |
Available-for-sale securities |  |
Less Than 12 Months, Fair Value | 54,511,000 | 82,999,000
Less Than 12 Months, Unrealized Losses | 176,000 | 320,000
12 Months Or Longer, Fair Value | 5,079,000 | 5,549,000
12 Months Or Longer, Unrealized Losses | 42,000 | 58,000
Total Fair Value | 59,590,000 | 88,548,000
Total Unrealized Losses | 218,000 | 378,000
Mortgage-Backed Securities [Member] |  |
Available-for-sale securities |  |
Less Than 12 Months, Fair Value | 2,000 | 2,000
Less Than 12 Months, Unrealized Losses | 0 | 0
12 Months Or Longer, Fair Value | 0 | 0
12 Months Or Longer, Unrealized Losses | 0 | 0
Total Fair Value | 2,000 | 2,000
Total Unrealized Losses | 0 | 0
U.S. Government Treasury [Member] |  |
Held-to-maturity debt securities |  |
Less Than 12 Months, Fair Value | 24,574,000 | 77,861,000
Less Than 12 Months, Unrealized Losses | 489,000 | 298,000
12 Months Or Longer, Fair Value | 24,882,000 | 14,939,000
12 Months Or Longer, Unrealized Losses | 179,000 | 143,000
Total Fair Value | 49,456,000 | 92,800,000
Total Unrealized Losses | 668,000 | 441,000
U.S. Government Agency [Member] |  |
Held-to-maturity debt securities |  |
Less Than 12 Months, Fair Value | 0 | 0
Less Than 12 Months, Unrealized Losses | 0 | 0
12 Months Or Longer, Fair Value | 0 | 0
12 Months Or Longer, Unrealized Losses | 0 | 0
Total Fair Value | 0 | 0
Total Unrealized Losses | 0 | 0
States and Political Subdivisions [Member] |  |
Held-to-maturity debt securities |  |
Less Than 12 Months, Fair Value | 6,093,000 | 6,955,000
Less Than 12 Months, Unrealized Losses | 25,000 | 41,000
12 Months Or Longer, Fair Value | 496,000 | 0
12 Months Or Longer, Unrealized Losses | 7,000 | 0
Total Fair Value | 6,589,000 | 6,955,000
Total Unrealized Losses | 32,000 | 41,000
Mortgage-Backed Securities [Member] |  |
Held-to-maturity debt securities |  |
Less Than 12 Months, Fair Value | 108,323,000 | 56,030,000
Less Than 12 Months, Unrealized Losses | 1,742,000 | 469,000
12 Months Or Longer, Fair Value | 29,894,000 | 30,216,000
12 Months Or Longer, Unrealized Losses | 1,308,000 | 743,000
Total Fair Value | 138,217,000 | 86,246,000
Total Unrealized Losses | $ 3,050,000 | $ 1,212,000

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