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FAIR VALUE - Gross unrealized losses and fair value, aggregated by investment category and length of time that individual securities (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months Fair Value | $ 40,326 | $ 20,188
Less than 12 months Unrealized Loss | (878) | (198)
12 months or more Fair Value | 38,195 | 40,641
12 months or more Unrealized Loss | (1,736) | (1,084)
Total Fair Value | 78,521 | 60,829
Total Unrealized Loss | (2,614) | (1,282)
Residential mortgage-backed securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months Fair Value | 14,707 | 13,333
Less than 12 months Unrealized Loss | (402) | (143)
12 months or more Fair Value | 31,610 | 33,896
12 months or more Unrealized Loss | (1,456) | (927)
Total Fair Value | 46,317 | 47,229
Total Unrealized Loss | (1,858) | (1,070)
Municipal securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months Fair Value | 17,903 | 2,396
Less than 12 months Unrealized Loss | (336) | (11)
12 months or more Fair Value | 6,079 | 6,230
12 months or more Unrealized Loss | (271) | (148)
Total Fair Value | 23,982 | 8,626
Total Unrealized Loss | (607) | (159)
U.S. Government agency securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months Fair Value | 6,230 | 2,965
Less than 12 months Unrealized Loss | (125) | (37)
12 months or more Fair Value | 506 | 515
12 months or more Unrealized Loss | (9) | (9)
Total Fair Value | 6,736 | 3,480
Total Unrealized Loss | (134) | (46)
U.S. Treasury securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Less than 12 months Fair Value | 1,486 | 1,494
Less than 12 months Unrealized Loss | (15) | (7)
Total Fair Value | 1,486 | 1,494
Total Unrealized Loss | $ (15) | $ (7)

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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months. + References No definition available. + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer. + References No definition available. + Details
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