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Investment securities (Tables) | 6 Months Ended
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Jun. 30, 2017
Schedule of amortized cost and fair value of investment securities aggregated by investment category |
|  |  |  |  | Gross |  | Gross |  |  |  |
|  | Amortized |  | Unrealized |  | Unrealized |  | Fair |
June 30, 2017 |  | Cost |  | Gains |  | Losses |  | Value |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 20,047 |  | $ | 56 |  | $ | 23 |  | $ | 20,080 |
U.S. Government-sponsored enterprises |  |  | 81,495 |  |  | 96 |  |  | 847 |  |  | 80,744 |
State and municipals: |  |  |  |  |  |  |  |  |  |  |  |  |
Taxable |  |  | 14,629 |  |  | 667 |  |  | 1 |  |  | 15,295 |
Tax-exempt |  |  | 102,737 |  |  | 2,191 |  |  | 59 |  |  | 104,869 |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies |  |  | 17,576 |  |  | 31 |  |  | 29 |  |  | 17,578 |
U.S. Government-sponsored enterprises |  |  | 18,280 |  |  | 39 |  |  | 111 |  |  | 18,208 |
Total |  | $ | 254,764 |  | $ | 3,080 |  | $ | 1,070 |  | $ | 256,774 |
Held-to-maturity: |  |  |  |  |  |  |  |  |  |  |  |  |
Tax-exempt state and municipals |  | $ | 6,860 |  | $ | 163 |  | $ | 3 |  | $ | 7,020 |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies |  |  | 61 |  |  |  |  |  |  |  |  | 61 |
U.S. Government-sponsored enterprises |  |  | 2,947 |  |  | 193 |  |  |  |  |  | 3,140 |
Total |  | $ | 9,868 |  | $ | 356 |  | $ | 3 |  | $ | 10,221 |
|  |  |  |  | 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 |
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 |
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 |
June 30, 2017 |  | Value |  | Losses |  | Value |  | Losses |  | Value |  | Losses |
U.S. Treasury securities |  | $ | 2,501 |  | $ | 23 |  |  |  |  |  |  |  | $ | 2,501 |  | $ | 23 |
U.S. Government-sponsored enterprises |  |  | 65,845 |  |  | 823 |  | $ | 1,067 |  | $ | 24 |  |  | 66,912 |  |  | 847 |
State and municipals: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Taxable |  |  | 554 |  |  | 1 |  |  |  |  |  |  |  |  | 554 |  |  | 1 |
Tax-exempt |  |  | 15,898 |  |  | 62 |  |  |  |  |  |  |  |  | 15,898 |  |  | 62 |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies |  |  | 2,848 |  |  | 8 |  |  | 3,503 |  |  | 21 |  |  | 6,351 |  |  | 29 |
U.S. Government-sponsored enterprises |  |  | 11,218 |  |  | 50 |  |  | 2,327 |  |  | 61 |  |  | 13,545 |  |  | 111 |
Total |  | $ | 98,864 |  | $ | 967 |  | $ | 6,897 |  | $ | 106 |  | $ | 105,761 |  | $ | 1,073 |
|  | 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 |
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 |
June 30, 2017 |  | Value |
Within one year |  | $ | 33,157 |
After one but within five years |  |  | 127,433 |
After five but within ten years |  |  | 45,799 |
After ten years |  |  | 14,599 |
|  |  | 220,988 |
Mortgage-backed securities |  |  | 35,786 |
Total |  | $ | 256,774 |
Held-to-maturity Securities |
Schedule of maturity distribution of fair value |
|  | Amortized |  | Fair |
June 30, 2017 |  | Cost |  | Value |
Within one year |  |  |  |  |  |  |
After one but within five years |  |  |  |  |  |  |
After five but within ten years |  |  |  |  |  |  |
After ten years |  | $ | 6,860 |  | $ | 7,020 |
|  |  | 6,860 |  |  | 7,020 |
Mortgage-backed securities |  |  | 3,008 |  |  | 3,201 |
Total |  | $ | 9,868 |  | $ | 10,221 |

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