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Investment securities (Tables) | 3 Months Ended
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Mar. 31, 2017
Amortized cost and fair value of investment securities aggregated by investment category |
|  |  |  |  | Gross |  | Gross |  |  |  |
|  | Amortized |  | Unrealized |  | Unrealized |  | Fair |
March 31, 2017 |  | Cost |  | Gains |  | Losses |  | Value |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 20,050 |  | $ | 1 |  | $ | 156 |  | $ | 19,895 |
U.S. Government-sponsored enterprises |  |  | 83,677 |  |  | 72 |  |  | 1,277 |  |  | 82,472 |
State and municipals: |  |  |  |  |  |  |  |  |  |  |  |  |
Taxable |  |  | 14,663 |  |  | 604 |  |  |  |  |  | 15,267 |
Tax-exempt |  |  | 105,894 |  |  | 2,104 |  |  | 461 |  |  | 107,537 |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies |  |  | 19,321 |  |  | 47 |  |  | 36 |  |  | 19,332 |
U.S. Government-sponsored enterprises |  |  | 20,213 |  |  | 46 |  |  | 118 |  |  | 20,141 |
Total |  | $ | 263,818 |  | $ | 2,874 |  | $ | 2,048 |  | $ | 264,644 |
Held-to-maturity: |  |  |  |  |  |  |  |  |  |  |  |  |
Tax-exempt state and municipals |  | $ | 6,861 |  | $ | 86 |  | $ | 83 |  | $ | 6,864 |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies |  |  | 64 |  |  |  |  |  |  |  |  | 64 |
U.S. Government-sponsored enterprises |  |  | 3,255 |  |  | 176 |  |  |  |  |  | 3,431 |
Total |  | $ | 10,180 |  | $ | 262 |  | $ | 83 |  | $ | 10,359 |
|  |  |  |  | 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 |
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 |
March 31, 2017 |  | Value |  | Losses |  | Value |  | Losses |  | Value |  | Losses |
U.S. Treasury securities |  | $ | 17,411 |  | $ | 156 |  |  |  |  |  |  |  | $ | 17,411 |  | $ | 156 |
U.S. Government-sponsored enterprises |  |  | 62,591 |  |  | 1,277 |  |  |  |  |  |  |  |  | 62,591 |  |  | 1,277 |
State and municipals: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Taxable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax-exempt |  |  | 51,467 |  |  | 544 |  |  |  |  |  |  |  |  | 51,467 |  |  | 544 |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies |  |  | 5,769 |  |  | 23 |  | $ | 1,337 |  | $ | 13 |  |  | 7,106 |  |  | 36 |
U.S. Government-sponsored enterprises |  |  | 13,832 |  |  | 66 |  |  | 2,380 |  |  | 52 |  |  | 16,212 |  |  | 118 |
Total |  | $ | 151,070 |  | $ | 2,066 |  | $ | 3,717 |  | $ | 65 |  | $ | 154,787 |  | $ | 2,131 |
|  | 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 |
Maturity distribution of fair value |
|  | Fair |
March 31, 2017 |  | Value |
Within one year |  | $ | 39,613 |
After one but within five years |  |  | 118,950 |
After five but within ten years |  |  | 49,157 |
After ten years |  |  | 17,451 |
|  |  | 225,171 |
Mortgage-backed securities |  |  | 39,473 |
Total |  | $ | 264,644 |
Held-to-maturity Securities |
Maturity distribution of fair value |
|  | Amortized |  | Fair |
March 31, 2017 |  | Cost |  | Value |
Within one year |  |  |  |  |  |  |
After one but within five years |  |  |  |  |  |  |
After five but within ten years |  |  |  |  |  |  |
After ten years |  | $ | 6,861 |  | $ | 6,864 |
|  |  | 6,861 |  |  | 6,864 |
Mortgage-backed securities |  |  | 3,319 |  |  | 3,495 |
Total |  | $ | 10,180 |  | $ | 10,359 |

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