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INVESTMENT SECURITIES (Unrealized Losses on Investment Securities) (Details) - USD ($) | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Available-for-sale securities |  |
Less Than 12 Months, Fair Value | $ 40,058,000 | $ 89,910,000
Less Than 12 Months, Unrealized Losses | 239,000 | 363,000
12 Months Or Longer, Fair Value | 259,744,000 | 253,653,000
12 Months Or Longer, Unrealized Losses | 1,964,000 | 2,912,000
Total Fair Value | 299,802,000 | 343,563,000
Total Unrealized Losses | 2,203,000 | 3,275,000
Held-to-maturity debt securities |  |
Less Than 12 Months, Fair Value | 10,413,000 | 51,531,000
Less Than 12 Months, Unrealized Losses | 82,000 | 389,000
12 Months Or Longer, Fair Value | 126,192,000 | 125,598,000
12 Months Or Longer, Unrealized Losses | 1,448,000 | 2,738,000
Total Fair Value | 136,605,000 | 177,129,000
Total Unrealized Losses | 1,530,000 | 3,127,000
U.S. Government Treasury [Member] |  |
Available-for-sale securities |  |
Less Than 12 Months, Fair Value | 0 | 28,420,000
Less Than 12 Months, Unrealized Losses | 0 | 80,000
12 Months Or Longer, Fair Value | 197,921,000 | 193,501,000
12 Months Or Longer, Unrealized Losses | 1,688,000 | 2,536,000
Total Fair Value | 197,921,000 | 221,921,000
Total Unrealized Losses | 1,688,000 | 2,616,000
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 | 34,766,000 | 34,612,000
12 Months Or Longer, Unrealized Losses | 311,000 | 477,000
Total Fair Value | 34,766,000 | 34,612,000
Total Unrealized Losses | 311,000 | 477,000
U.S. Government Agency [Member] |  |
Available-for-sale securities |  |
Less Than 12 Months, Fair Value | 35,901,000 | 53,237,000
Less Than 12 Months, Unrealized Losses | 238,000 | 271,000
12 Months Or Longer, Fair Value | 39,054,000 | 28,735,000
12 Months Or Longer, Unrealized Losses | 230,000 | 244,000
Total Fair Value | 74,955,000 | 81,972,000
Total Unrealized Losses | 468,000 | 515,000
States and Political Subdivisions [Member] |  |
Available-for-sale securities |  |
Less Than 12 Months, Fair Value | 4,148,000 | 8,243,000
Less Than 12 Months, Unrealized Losses | 1,000 | 12,000
12 Months Or Longer, Fair Value | 22,769,000 | 31,417,000
12 Months Or Longer, Unrealized Losses | 46,000 | 132,000
Total Fair Value | 26,917,000 | 39,660,000
Total Unrealized Losses | 47,000 | 144,000
Held-to-maturity debt securities |  |
Less Than 12 Months, Fair Value | 203,000 | 204,000
Less Than 12 Months, Unrealized Losses | 0 | 0
12 Months Or Longer, Fair Value | 5,747,000 | 6,281,000
12 Months Or Longer, Unrealized Losses | 10,000 | 26,000
Total Fair Value | 5,950,000 | 6,485,000
Total Unrealized Losses | 10,000 | 26,000
Mortgage-Backed Securities [Member] |  |
Available-for-sale securities |  |
Less Than 12 Months, Fair Value | 9,000 | 10,000
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 | 9,000 | 10,000
Total Unrealized Losses | 0 | 0
Held-to-maturity debt securities |  |
Less Than 12 Months, Fair Value | 10,210,000 | 51,327,000
Less Than 12 Months, Unrealized Losses | 82,000 | 389,000
12 Months Or Longer, Fair Value | 85,679,000 | 84,705,000
12 Months Or Longer, Unrealized Losses | 1,127,000 | 2,235,000
Total Fair Value | 95,889,000 | 136,032,000
Total Unrealized Losses | $ 1,209,000 | $ 2,624,000

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