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Investment Securities (Tables) | 12 Months Ended
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Dec. 31, 2018
Investment Securities [Abstract] |
Summary of amortized costs and fair value of investment securities |
|  | December 31, 2018
|  | Amortized |  | Gross Unrealized |  | Fair
(dollars in thousands) |  |  | Cost |  | Gains |  | Losses |  | Value
Available for sale |  |  |  |  |  |  |  |  |
US government agencies |  | $ | 8,975 |  | 1 |  | 194 |  | 8,782
SBA securities |  |  | 3,628 |  | - |  | 103 |  | 3,525
State and political subdivisions |  |  | 8,371 |  | 48 |  | 63 |  | 8,356
Asset-backed securities |  |  | 9,595 |  | 12 |  | 49 |  | 9,558
Mortgage-backed securities |  |  |  |  |  |  |  |  |
FHLMC |  |  | 12,258 |  | 87 |  | 242 |  | 12,103
FNMA |  |  | 29,068 |  | 25 |  | 551 |  | 28,542
GNMA |  |  | 4,170 |  | 1 |  | 132 |  | 4,039
Total mortgage-backed securities |  |  | 45,496 |  | 113 |  | 925 |  | 44,684
Total |  | $ | 76,065 |  | 174 |  | 1,334 |  | 74,905
Summary of amortized costs and fair values of investment securities available for sale by contractual maturity |
|  | December 31, 2017
|  | Amortized |  | Gross Unrealized |  | Fair
|  |  | 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
Summary of gross unrealized losses on investment securities and fair market value of related securities |
|  | December 31,
|  |  |  |  | 2018 |  |  |  | 2017
|  | 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 |  |  | 8,681 |  | 8,578 |  | 2,677 |  | 2,666
Due after five through ten years |  |  | 22,796 |  | 22,379 |  | 24,796 |  | 24,645
Due after ten years |  |  | 44,588 |  | 43,948 |  | 39,273 |  | 38,865
|  | $ | 76,065 |  | 74,905 |  | 68,181 |  | 67,603
Summary of other investments |
|  | 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, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
US government agencies |  | 1 |  | $ | 1,246 |  | $ | 3 |  | 8 |  | $ | 7,035 |  | $ | 191 |  | 9 |  | $ | 8,281 |  | $ | 194
SBA securities |  | - |  |  | - |  |  | - |  | 2 |  |  | 3,525 |  |  | 103 |  | 2 |  |  | 3,525 |  |  | 103
State and political subdivisions |  | - |  |  | - |  |  | - |  | 7 |  |  | 2,829 |  |  | 63 |  | 7 |  |  | 2,829 |  |  | 63
Asset-backed |  | 4 |  |  | 6,707 |  |  | 49 |  | - |  |  | - |  |  | - |  | 4 |  |  | 6,707 |  |  | 49
Mortgage-backed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
FHLMC |  | - |  |  | - |  |  | - |  | 10 |  |  | 7,402 |  |  | 242 |  | 10 |  |  | 7,402 |  |  | 242
FNMA |  | 2 |  |  | 2,689 |  |  | 6 |  | 23 |  |  | 22,814 |  |  | 545 |  | 25 |  |  | 25,503 |  |  | 551
GNMA |  | 1 |  |  | 1,104 |  |  | 6 |  | 3 |  |  | 2,919 |  |  | 126 |  | 4 |  |  | 4,023 |  |  | 132
|  | 8 |  | $ | 11,746 |  | $ | 64 |  | 53 |  | $ | 46,524 |  | $ | 1,270 |  | 61 |  | $ | 58,270 |  | $ | 1,334
|  | 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, 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

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