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Investment securities (Tables) | 12 Months Ended
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Dec. 31, 2018
Schedule of amortized cost and fair value of investment securities aggregated by investment category |
|  |  |  |  | Gross |  | Gross |  |  |  |
|  | Amortized |  | Unrealized |  | Unrealized |  | Fair |
December 31, 2018 |  | Cost |  | Gains |  | Losses |  | Value |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 25,948 |  | $ | 9 |  | $ | 365 |  | $ | 25,592 |
U.S. Government-sponsored enterprises |  |  | 94,999 |  |  | 2 |  |  | 2,183 |  |  | 92,818 |
State and municipals: |  |  |  |  |  |  |  |  |  |  |  |  |
Taxable |  |  | 13,544 |  |  | 309 |  |  |  |  |  | 13,853 |
Tax-exempt |  |  | 86,361 |  |  | 338 |  |  | 745 |  |  | 85,954 |
Residential Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies |  |  | 12,663 |  |  | 50 |  |  | 84 |  |  | 12,629 |
U.S. Government-sponsored enterprises |  |  | 33,149 |  |  | 49 |  |  | 401 |  |  | 32,797 |
Commercial Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government-sponsored enterprises |  |  | 6,269 |  |  |  |  |  | 230 |  |  | 6,039 |
Total |  | $ | 272,933 |  | $ | 757 |  | $ | 4,008 |  | $ | 269,682 |
Held-to-maturity: |  |  |  |  |  |  |  |  |  |  |  |  |
Tax-exempt state and municipals |  | $ | 6,855 |  | $ | 12 |  | $ | 43 |  | $ | 6,824 |
Residential Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies |  |  | 42 |  |  |  |  |  |  |  |  | 42 |
U.S. Government-sponsored enterprises |  |  | 1,464 |  |  | 55 |  |  | 5 |  |  | 1,514 |
Total |  | $ | 8,361 |  | $ | 67 |  | $ | 48 |  | $ | 8,380 |
|  |  |  |  | Gross |  | Gross |  |  |  |
|  | Amortized |  | Unrealized |  | Unrealized |  | Fair |
December 31, 2017 |  | Cost |  | Gains |  | Losses |  | Value |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 20,042 |  |  |  |  | $ | 228 |  | $ | 19,814 |
U.S. Government-sponsored enterprises |  |  | 95,358 |  | $ | 30 |  |  | 1,740 |  |  | 93,648 |
State and municipals: |  |  |  |  |  |  |  |  |  |  |  |  |
Taxable |  |  | 14,559 |  |  | 488 |  |  |  |  |  | 15,047 |
Tax-exempt |  |  | 103,199 |  |  | 1,136 |  |  | 502 |  |  | 103,833 |
Residential Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies |  |  | 14,517 |  |  | 2 |  |  | 85 |  |  | 14,434 |
U.S. Government-sponsored enterprises |  |  | 19,752 |  |  | 10 |  |  | 231 |  |  | 19,531 |
Commercial Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government-sponsored enterprises |  |  | 6,315 |  |  |  |  |  | 120 |  |  | 6,195 |
Total |  | $ | 273,742 |  | $ | 1,666 |  | $ | 2,906 |  | $ | 272,502 |
Held-to-maturity: |  |  |  |  |  |  |  |  |  |  |  |  |
Tax-exempt state and municipals |  | $ | 6,859 |  | $ | 152 |  | $ | 13 |  | $ | 6,998 |
Residential Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies |  |  | 54 |  |  |  |  |  |  |  |  | 54 |
U.S. Government-sponsored enterprises |  |  | 2,361 |  |  | 138 |  |  | 4 |  |  | 2,495 |
Total |  | $ | 9,274 |  | $ | 290 |  | $ | 17 |  | $ | 9,547 |
Schedule of fair value and unrealized losses of investment securities in continuous unrealized loss position |
|  | Less Than 12 Months |  | 12 Months or More |  | Total |
|  | Fair |  | Unrealized |  | Fair |  | Unrealized |  | Fair |  | Unrealized |
December 31, 2018 |  | Value |  | Losses |  | Value |  | Losses |  | Value |  | Losses |
U.S. Treasury securities |  | $ | 1,995 |  | $ | 2 |  | $ | 19,671 |  | $ | 363 |  | $ | 21,666 |  | $ | 365 |
U.S. Government-sponsored enterprises |  |  | 2,037 |  |  | 1 |  |  | 89,729 |  |  | 2,182 |  |  | 91,766 |  |  | 2,183 |
State and municipals: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax-exempt |  |  | 9,022 |  |  | 74 |  |  | 52,352 |  |  | 714 |  |  | 61,374 |  |  | 788 |
Residential Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies |  |  |  |  |  |  |  |  | 7,800 |  |  | 84 |  |  | 7,800 |  |  | 84 |
U.S. Government-sponsored enterprises |  |  | 12,851 |  |  | 55 |  |  | 13,881 |  |  | 351 |  |  | 26,732 |  |  | 406 |
Commercial Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government-sponsored enterprises |  |  |  |  |  |  |  |  | 6,039 |  |  | 230 |  |  | 6,039 |  |  | 230 |
Total |  | $ | 25,905 |  | $ | 132 |  | $ | 189,472 |  | $ | 3,924 |  | $ | 215,377 |  | $ | 4,056 |
|  | Less Than 12 Months |  | 12 Months or More |  | Total |
|  | Fair |  | Unrealized |  | Fair |  | Unrealized |  | Fair |  | Unrealized |
December 31, 2017 |  | Value |  | Losses |  | Value |  | Losses |  | Value |  | Losses |
U.S. Treasury securities |  | $ | 17,350 |  | $ | 170 |  | $ | 2,464 |  | $ | 58 |  | $ | 19,814 |  | $ | 228 |
U.S. Government-sponsored enterprises |  |  | 39,096 |  |  | 445 |  |  | 51,365 |  |  | 1,295 |  |  | 90,461 |  |  | 1,740 |
State and municipals: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax-exempt |  |  | 54,788 |  |  | 454 |  |  | 3,808 |  |  | 61 |  |  | 58,596 |  |  | 515 |
Residential Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies |  |  | 9,484 |  |  | 39 |  |  | 3,968 |  |  | 46 |  |  | 13,452 |  |  | 85 |
U.S. Government-sponsored enterprises |  |  | 12,537 |  |  | 103 |  |  | 6,504 |  |  | 132 |  |  | 19,041 |  |  | 235 |
Commercial Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government-sponsored enterprises |  |  | 6,195 |  |  | 120 |  |  |  |  |  |  |  |  | 6,195 |  |  | 120 |
Total |  | $ | 139,450 |  | $ | 1,331 |  | $ | 68,109 |  | $ | 1,592 |  | $ | 207,559 |  | $ | 2,923 |
Summary of unrealized and realized gains and losses |
Year Ended December 31, |  |  | 2018 |
Net gains recognized during the period on equity securities |  | $ | 14 |
Less: Net gains and (losses) recognized during the period on equity securities sold during the period |  |  |  |
Unrealized gains recognized during the reporting period on equity securities still held at the reporting date |  | $ | 14 |
Available-for-Sale Securities. |
Schedule of maturity distribution of fair value |
December 31, 2018 |  |  |
Within one year |  | $ | 38,925 |
After one but within five years |  |  | 152,806 |
After five but within ten years |  |  | 15,900 |
After ten years |  |  | 10,586 |
|  |  | 218,217 |
Mortgage-backed securities |  |  | 51,465 |
Total |  | $ | 269,682 |
Held-to-maturity Securities. |
Schedule of maturity distribution of fair value |
|  | Amortized |  | Fair |
December 31, 2018 |  | Cost |  | Value |
Within one year |  |  |  |  |  |  |
After one but within five years |  |  |  |  |  |  |
After five but within ten years |  |  |  |  |  |  |
After ten years |  | $ | 6,855 |  | $ | 6,824 |
|  |  | 6,855 |  |  | 6,824 |
Mortgage-backed securities |  |  | 1,506 |  |  | 1,556 |
Total |  | $ | 8,361 |  | $ | 8,380 |

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