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Investment Securities (Tables) | 12 Months Ended
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Dec. 31, 2017
Investment Securities [Abstract] |
Summary of amortized costs and fair value of investment securities |
|  |  |  |  |  |  |  |  | December 31, 2017
|  | Amortized |  |  |  | Gross Unrealized |  | Fair
(dollars in thousands) |  | Cost |  | Gains |  | Losses |  | Value
Available for sale |  |  |  |  |  |  |  |  |
US government agencies |  | $ | 8,749 |  | 1 |  | 97 |  | 8,653
SBA securities |  |  | 4,087 |  | - |  | 24 |  | 4,063
State and political subdivisions |  |  | 11,242 |  | 179 |  | 25 |  | 11,396
Mortgage-backed securities |  |  |  |  |  |  |  |  |
FHLMC |  |  | 9,102 |  | - |  | 149 |  | 8,953
FNMA |  |  | 29,383 |  | 3 |  | 386 |  | 29,000
GNMA |  |  | 5,618 |  | 2 |  | 82 |  | 5,538
Total mortgage-backed securities |  |  | 44,103 |  | 5 |  | 617 |  | 43,491
Total |  | $ | 68,181 |  | 185 |  | 763 |  | 67,603
|  |  |  |  |  |  |  |  | December 31, 2016
|  | Amortized |  |  |  | Gross Unrealized |  | Fair
|  | Cost |  | Gains |  | Losses |  | Value
Available for sale |  |  |  |  |  |  |  |  |
US government agencies |  | $ | 6,271 |  | 1 |  | 113 |  | 6,159
SBA securities |  |  | 1,453 |  | - |  | 16 |  | 1,437
State and political subdivisions |  |  | 20,625 |  | 141 |  | 292 |  | 20,474
Mortgage-backed securities |  |  |  |  |  |  |  |  |
FHLMC |  |  | 10,922 |  | - |  | 185 |  | 10,737
FNMA |  |  | 24,827 |  | 19 |  | 277 |  | 24,569
GNMA |  |  | 1,146 |  | 2 |  | 44 |  | 1,104
Total mortgage-backed securities |  |  | 36,895 |  | 21 |  | 506 |  | 36,410
Total |  | $ | 65,244 |  | 163 |  | 927 |  | 64,480
Summary of amortized costs and fair values of investment securities available for sale by contractual maturity |
|  |  |  |  |  |  |  |  | December 31,
|  |  |  |  | 2017 |  |  |  | 2016
|  | Amortized |  | Fair |  | Amortized |  | Fair
(dollars in thousands) |  | Cost |  | Value |  | Cost |  | Value
Available for sale |  |  |  |  |  |  |  |  |
Due within one year |  | $ | 1,435 |  | 1,427 |  | - |  | -
Due after one through five years |  |  | 2,677 |  | 2,666 |  | 3,303 |  | 3,268
Due after five through ten years |  |  | 24,796 |  | 24,645 |  | 26,234 |  | 25,976
Due after ten years |  |  | 39,273 |  | 38,865 |  | 35,707 |  | 35,236
|  | $ | 68,181 |  | 67,603 |  | 65,244 |  | 64,480
Summary of gross unrealized losses on investment securities and fair market value of related securities |
|  |  |  | Less than 12 months |  |  |  | 12 months or longer |  |  |  |  |  |  | Total
|  |  |  | Fair |  | Unrealized |  |  |  | Fair |  | Unrealized |  |  |  | Fair |  | Unrealized
(dollars in thousands) |  | # |  | value |  | losses |  | # |  | value |  | losses |  | # |  | value |  | losses
As of December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
US government agencies |  | 5 |  | $ | 4,184 |  | $ | 22 |  | 4 |  | $ | 3,968 |  | $ | 75 |  | 9 |  | $ | 8,152 |  | $ | 97
SBA securities |  | 1 |  |  | 2,936 |  |  | 13 |  | 1 |  |  | 1,127 |  |  | 11 |  | 2 |  |  | 4,063 |  |  | 24
State and political subdivisions |  | 3 |  |  | 1,214 |  |  | 9 |  | 2 |  |  | 792 |  |  | 16 |  | 5 |  |  | 2,006 |  |  | 25
Mortgage-backed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
FHLMC |  | 3 |  |  | 2,897 |  |  | 26 |  | 7 |  |  | 6,056 |  |  | 123 |  | 10 |  |  | 8,953 |  |  | 149
FNMA |  | 11 |  |  | 14,345 |  |  | 135 |  | 13 |  |  | 14,597 |  |  | 251 |  | 24 |  |  | 29,940 |  |  | 386
GNMA |  | 2 |  |  | 2,270 |  |  | 40 |  | 1 |  |  | 971 |  |  | 42 |  | 3 |  |  | 2,243 |  |  | 82
|  | 25 |  | $ | 27,846 |  | $ | 245 |  | 28 |  | $ | 27,511 |  | $ | 518 |  | 53 |  | $ | 55,357 |  | $ | 763
|  |  |  | Less than 12 months |  |  |  | 12 months or longer |  |  |  |  |  |  | Total
|  |  |  | Fair |  | Unrealized |  |  |  | Fair |  | Unrealized |  |  |  | Fair |  | Unrealized
|  | # |  | value |  | losses |  | # |  | value |  | losses |  | # |  | value |  | losses
As of December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
US government agencies |  | 5 |  | $ | 5,144 |  | $ | 113 |  | - |  | $ | - |  | $ | - |  | 5 |  | $ | 5,144 |  | $ | 113
SBA securities |  | 1 |  |  | 1,437 |  |  | 16 |  | - |  |  | - |  |  | - |  | 1 |  |  | 1,437 |  |  | 16
State and political subdivisions |  | 32 |  |  | 13,936 |  |  | 292 |  | - |  |  | - |  |  | - |  | 32 |  |  | 13,936 |  |  | 292
Mortgage-backed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
FHLMC |  | 10 |  |  | 10,737 |  |  | 185 |  | - |  |  | - |  |  | - |  | 10 |  |  | 10,737 |  |  | 185
FNMA |  | 14 |  |  | 15,478 |  |  | 247 |  | 2 |  |  | 3,991 |  |  | 30 |  | 16 |  |  | 19,469 |  |  | 277
GNMA |  | 1 |  |  | 1,077 |  |  | 44 |  | - |  |  | - |  |  | - |  | 1 |  |  | 1,077 |  |  | 44
|  | 63 |  | $ | 47,809 |  | $ | 897 |  | 2 |  | $ | 3,991 |  | $ | 30 |  | 65 |  | $ | 51,800 |  | $ | 927
Summary of other investments |
|  |  |  |  | December 31,
(dollars in thousands) |  | 2017 |  | 2016
Federal Home Loan Bank stock |  | $ | 3,754 |  | 5,173
Other investments |  |  | 305 |  | 166
Investment in Trust Preferred subsidiaries |  |  | 403 |  | 403
|  | $ | 4,462 |  | 5,742

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