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Investment Securities (Tables) | 12 Months Ended
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Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract] |
Schedule of summary of investment securities |
|  | At December 31, 2017
|  |  |  |  | Gross |  | Gross |  |  |
|  | Amortized |  | Unrealized |  | Unrealized |  | Fair
(dollars in thousands) |  | Cost |  | Gains |  | Losses |  | Value
Collaterized mortgage obligations |  | $ | 24,063 |  | $ | 20 |  | $ | (569) |  | $ | 23,514
Agency mortgage-backed securities |  |  | 25,725 |  |  | 4 |  |  | (500) |  |  | 25,229
Municipal securities |  |  | 35,453 |  |  | 339 |  |  | (159) |  |  | 35,633
U.S. Government agency securities |  |  | 3,526 |  |  | — |  |  | (46) |  |  | 3,480
U.S. Treasury securities |  |  | 1,501 |  |  | — |  |  | (8) |  |  | 1,493
Total securities available for sale |  | $ | 90,268 |  | $ | 363 |  | $ | (1,282) |  | $ | 89,349
|  | At December 31, 2016
|  |  |  |  | Gross |  | Gross |  |  |
|  | Amortized |  | Unrealized |  | Unrealized |  | Fair
(dollars in thousands) |  | Cost |  | Gains |  | Losses |  | Value
Collaterized mortgage obligations |  | $ | 31,997 |  | $ | 11 |  | $ | (423) |  | $ | 31,585
Agency mortgage-backed securities |  |  | 27,110 |  |  | 2 |  |  | (429) |  |  | 26,683
Municipal securities |  |  | 34,333 |  |  | 92 |  |  | (580) |  |  | 33,845
U.S. Government agency securities |  |  | 1,003 |  |  | — |  |  | (16) |  |  | 987
U.S. Treasury securities |  |  | 1,501 |  |  | 5 |  |  | — |  |  | 1,506
Total securities available for sale |  | $ | 95,944 |  | $ | 110 |  | $ | (1,448) |  | $ | 94,606
Schedule of gross unrealized losses and fair value, aggregated by investment category and length of time in continuous unrealized loss position |
|  | December 31, 2017
|  | Less than 12 months |  | 12 months or more |  | Total
|  | Fair |  | Unrealized |  | Fair |  | Unrealized |  | Fair |  | Unrealized
(dollars in thousands) |  | Value |  | Loss |  | Value |  | Loss |  | Value |  | Loss
Collaterized mortgage obligations |  | $ | 6,531 |  | $ | (63) |  | $ | 15,678 |  | $ | (507) |  | $ | 22,209 |  | $ | (570)
Agency mortgage-backed securities |  |  | 6,802 |  |  | (80) |  |  | 18,218 |  |  | (420) |  |  | 25,020 |  |  | (500)
Municipal securities |  |  | 2,396 |  |  | (11) |  |  | 6,230 |  |  | (148) |  |  | 8,626 |  |  | (159)
U.S. Government agency securities |  |  | 2,965 |  |  | (37) |  |  | 515 |  |  | (9) |  |  | 3,480 |  |  | (46)
U.S. Treasury securities |  |  | 1,494 |  |  | (7) |  |  | — |  |  | — |  |  | 1,494 |  |  | (7)
|  | $ | 20,188 |  | $ | (198) |  | $ | 40,641 |  | $ | (1,084) |  | $ | 60,829 |  | $ | (1,282)
|  | At December 31, 2016
|  | Less than 12 months |  | 12 months or more |  | Total
|  | Fair |  | Unrealized |  | Fair |  | Unrealized |  | Fair |  | Unrealized
(dollars in thousands) |  | Value |  | Loss |  | Value |  | Loss |  | Value |  | Loss
Collaterized mortgage obligations |  | $ | 18,244 |  | $ | (174) |  | $ | 8,775 |  | $ | (248) |  | $ | 27,019 |  | $ | (422)
Agency mortgage-backed securities |  |  | 24,850 |  |  | (401) |  |  | 828 |  |  | (28) |  |  | 25,678 |  |  | (429)
Municipal securities |  |  | 19,200 |  |  | (580) |  |  | — |  |  | — |  |  | 19,200 |  |  | (580)
U.S. Government agency securities |  |  | — |  |  | — |  |  | 986 |  |  | (17) |  |  | 986 |  |  | (17)
|  | $ | 62,294 |  | $ | (1,155) |  | $ | 10,589 |  | $ | (293) |  | $ | 72,883 |  | $ | (1,448)
Schedule of contractual maturities of investment securities |
|  | At December 31, 2017
|  | Amortized |  | Fair
(dollars in thousands) |  | Cost |  | Value
Due within one year |  | $ | 899 |  | $ | 906
Due over one to five years |  |  | 1,319 |  |  | 1,311
Due over five to ten years |  |  | 4,742 |  |  | 4,765
Due over ten years |  |  | 33,520 |  |  | 33,624
Collaterized mortgage obligations |  |  | 24,063 |  |  | 23,514
Agency mortgage-backed securities |  |  | 25,725 |  |  | 25,229
Total securities available for sale |  | $ | 90,268 |  | $ | 89,349

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