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Investment securities (Tables) | 9 Months Ended
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Sep. 30, 2017
Schedule of amortized cost and fair value of investment securities aggregated by investment category |
|  |  |  |  | Gross |  | Gross |  |  |  |
|  | Amortized |  | Unrealized |  | Unrealized |  | Fair |
September 30, 2017 |  | Cost |  | Gains |  | Losses |  | Value |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 20,045 |  | $ | 29 |  | $ | 28 |  | $ | 20,046 |
U.S. Government-sponsored enterprises |  |  | 85,482 |  |  | 83 |  |  | 915 |  |  | 84,650 |
State and municipals: |  |  |  |  |  |  |  |  |  |  |  |  |
Taxable |  |  | 14,594 |  |  | 615 |  |  | 2 |  |  | 15,207 |
Tax-exempt |  |  | 98,494 |  |  | 2,062 |  |  | 51 |  |  | 100,505 |
Residential Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies |  |  | 16,045 |  |  | 21 |  |  | 33 |  |  | 16,033 |
U.S. Government-sponsored enterprises |  |  | 16,492 |  |  | 29 |  |  | 95 |  |  | 16,426 |
Commercial Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government-sponsored enterprises |  |  | 6,326 |  |  |  |  |  | 85 |  |  | 6,241 |
Common equity securities |  |  | 30 |  |  |  |  |  |  |  |  | 30 |
Total |  | $ | 257,508 |  | $ | 2,839 |  | $ | 1,209 |  | $ | 259,138 |
Held-to-maturity: |  |  |  |  |  |  |  |  |  |  |  |  |
Tax-exempt state and municipals |  | $ | 6,859 |  | $ | 185 |  | $ | 2 |  | $ | 7,042 |
Residential Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies |  |  | 58 |  |  |  |  |  |  |  |  | 58 |
U.S. Government-sponsored enterprises |  |  | 2,647 |  |  | 165 |  |  |  |  |  | 2,812 |
Total |  | $ | 9,564 |  | $ | 350 |  | $ | 2 |  | $ | 9,912 |
|  |  |  |  | Gross |  | Gross |  |  |  |
|  | Amortized |  | Unrealized |  | Unrealized |  | Fair |
December 31, 2016 |  | Cost |  | Gains |  | Losses |  | Value |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 7,570 |  |  |  |  | $ | 132 |  | $ | 7,438 |
U.S. Government-sponsored enterprises |  |  | 82,314 |  | $ | 79 |  |  | 1,480 |  |  | 80,913 |
State and municipals: |  |  |  |  |  |  |  |  |  |  |  |  |
Taxable |  |  | 14,698 |  |  | 566 |  |  | 39 |  |  | 15,225 |
Tax-exempt |  |  | 110,931 |  |  | 2,309 |  |  | 640 |  |  | 112,600 |
Residential Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies |  |  | 21,041 |  |  | 48 |  |  | 47 |  |  | 21,042 |
U.S. Government-sponsored enterprises |  |  | 22,303 |  |  | 48 |  |  | 159 |  |  | 22,192 |
Total |  | $ | 258,857 |  | $ | 3,050 |  | $ | 2,497 |  | $ | 259,410 |
Held-to-maturity: |  |  |  |  |  |  |  |  |  |  |  |  |
Tax-exempt state and municipals |  | $ | 6,862 |  | $ | 72 |  | $ | 67 |  | $ | 6,867 |
Residential Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies |  |  | 68 |  |  | 1 |  |  |  |  |  | 69 |
U.S. Government-sponsored enterprises |  |  | 3,587 |  |  | 191 |  |  |  |  |  | 3,778 |
Total |  | $ | 10,517 |  | $ | 264 |  | $ | 67 |  | $ | 10,714 |
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 |
September 30, 2017 |  | Value |  | Losses |  | Value |  | Losses |  | Value |  | Losses |
U.S. Treasury securities |  | $ | 5,494 |  | $ | 28 |  |  |  |  |  |  |  | $ | 5,494 |  | $ | 28 |
U.S. Government-sponsored enterprises |  |  | 48,573 |  |  | 376 |  | $ | 29,309 |  | $ | 539 |  |  | 77,882 |  |  | 915 |
State and municipals: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Taxable |  |  | 551 |  |  | 2 |  |  |  |  |  |  |  |  | 551 |  |  | 2 |
Tax-exempt |  |  | 5,330 |  |  | 50 |  |  | 2,482 |  |  | 3 |  |  | 7,812 |  |  | 53 |
Residential Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies |  |  | 5,671 |  |  | 13 |  |  | 3,175 |  |  | 20 |  |  | 8,846 |  |  | 33 |
U.S. Government-sponsored enterprises |  |  | 8,492 |  |  | 25 |  |  | 4,775 |  |  | 70 |  |  | 13,267 |  |  | 95 |
Commercial Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government-sponsored enterprises |  |  | 6,241 |  |  | 85 |  |  |  |  |  |  |  |  | 6,241 |  |  | 85 |
Total |  | $ | 80,352 |  | $ | 579 |  | $ | 39,741 |  | $ | 632 |  | $ | 120,093 |  | $ | 1,211 |
|  | Less Than 12 Months |  | 12 Months or More |  | Total |
|  | Fair |  | Unrealized |  | Fair |  | Unrealized |  | Fair |  | Unrealized |
December 31, 2016 |  | Value |  | Losses |  | Value |  | Losses |  | Value |  | Losses |
U.S. Treasury securities |  | $ | 7,438 |  | $ | 132 |  |  |  |  |  |  |  | $ | 7,438 |  | $ | 132 |
U.S. Government-sponsored enterprises |  |  | 59,460 |  |  | 1,480 |  |  |  |  |  |  |  |  | 59,460 |  |  | 1,480 |
State and municipals: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Taxable |  |  | 1,035 |  |  | 39 |  |  |  |  |  |  |  |  | 1,035 |  |  | 39 |
Tax-exempt |  |  | 55,166 |  |  | 707 |  | $ | 226 |  |  |  |  |  | 55,392 |  |  | 707 |
Residential Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies |  |  | 5,917 |  |  | 27 |  |  | 1,496 |  | $ | 20 |  |  | 7,413 |  |  | 47 |
U.S. Government-sponsored enterprises |  |  | 16,412 |  |  | 85 |  |  | 2,712 |  |  | 74 |  |  | 19,124 |  |  | 159 |
Total |  | $ | 145,428 |  | $ | 2,470 |  | $ | 4,434 |  | $ | 94 |  | $ | 149,862 |  | $ | 2,564 |
Available-for-Sale Securities |
Schedule of maturity distribution of fair value |
|  | Fair |
September 30, 2017 |  | Value |
Within one year |  | $ | 15,858 |
After one but within five years |  |  | 148,810 |
After five but within ten years |  |  | 40,582 |
After ten years |  |  | 15,158 |
|  |  | 220,408 |
Mortgage-backed securities |  |  | 38,700 |
Total |  | $ | 259,108 |
Held-to-maturity Securities |
Schedule of maturity distribution of fair value |
|  | Amortized |  | Fair |
September 30, 2017 |  | Cost |  | Value |
Within one year |  |  |  |  |  |  |
After one but within five years |  |  |  |  |  |  |
After five but within ten years |  |  |  |  |  |  |
After ten years |  | $ | 6,859 |  | $ | 7,042 |
|  |  | 6,859 |  |  | 7,042 |
Mortgage-backed securities |  |  | 2,705 |  |  | 2,870 |
Total |  | $ | 9,564 |  | $ | 9,912 |

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