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Investment securities (Tables) | 9 Months Ended
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Sep. 30, 2015
Amortized Cost and Fair Value of Investment Securities Aggregated by Investment Category |
|  |  |  |  | Gross |  | Gross |  |  |  |
|  | Amortized |  | Unrealized |  | Unrealized |  | Fair |
September 30, 2015 |  | Cost |  | Gains |  | Losses |  | Value |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 15,915 |  | $ | 152 |  |  | — |  | $ | 16,067 |
U.S. Government-sponsored enterprises |  |  | 79,077 |  |  | 547 |  | $ | 1 |  |  | 79,623 |
State and municipals: |  |  |  |  |  |  |  |  |  |  |  |  |
Taxable |  |  | 15,886 |  |  | 864 |  |  | 19 |  |  | 16,731 |
Tax-exempt |  |  | 113,198 |  |  | 3,913 |  |  | 302 |  |  | 116,809 |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies |  |  | 34,027 |  |  | 198 |  |  | 31 |  |  | 34,194 |
U.S. Government-sponsored enterprises |  |  | 36,282 |  |  | 235 |  |  | 109 |  |  | 36,408 |
Total |  | $ | 294,385 |  | $ | 5,909 |  | $ | 462 |  | $ | 299,832 |
Held-to-maturity: |  |  |  |  |  |  |  |  |  |  |  |  |
Tax-exempt state and municipals |  | $ | 7,369 |  | $ | 125 |  | $ | 50 |  | $ | 7,444 |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies |  |  | 88 |  |  | 1 |  |  | — |  |  | 89 |
U.S. Government-sponsored enterprises |  |  | 5,650 |  |  | 399 |  |  | — |  |  | 6,049 |
Total |  | $ | 13,107 |  | $ | 525 |  | $ | 50 |  | $ | 13,582 |
|  |  |  |  | Gross |  | Gross |  |  |  |
|  | Amortized |  | Unrealized |  | Unrealized |  | Fair |
December 31, 2014 |  | Cost |  | Gains |  | Losses |  | Value |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 48,393 |  | $ | 157 |  |  |  |  | $ | 48,550 |
U.S. Government-sponsored enterprises |  |  | 95,990 |  |  | 337 |  | $ | 82 |  |  | 96,245 |
State and municipals: |  |  |  |  |  |  |  |  |  |  |  |  |
Taxable |  |  | 16,490 |  |  | 943 |  |  | 26 |  |  | 17,407 |
Tax-exempt |  |  | 87,954 |  |  | 4,971 |  |  | 24 |  |  | 92,901 |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies |  |  | 37,511 |  |  | 132 |  |  | 167 |  |  | 37,476 |
U.S. Government-sponsored enterprises |  |  | 46,956 |  |  | 277 |  |  | 226 |  |  | 47,007 |
Total |  | $ | 333,294 |  | $ | 6,817 |  | $ | 525 |  | $ | 339,586 |
Held-to-maturity: |  |  |  |  |  |  |  |  |  |  |  |  |
Tax-exempt state and municipals |  | $ | 7,370 |  | $ | 105 |  | $ | 38 |  | $ | 7,437 |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies |  |  | 100 |  |  | 2 |  |  |  |  |  | 102 |
U.S. Government-sponsored enterprises |  |  | 7,195 |  |  | 481 |  |  |  |  |  | 7,676 |
Total |  |  | 14,665 |  | $ | 588 |  | $ | 38 |  | $ | 15,215 |
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, 2015 |  | Value |  | Losses |  | Value |  | Losses |  | Value |  | Losses |
U.S. Government-sponsored enterprises |  | $ | 3,006 |  | $ | 1 |  | $ |  |  | $ |  |  | $ | 3,006 |  | $ | 1 |
State and municipals: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Taxable |  |  |  |  |  |  |  |  | 546 |  |  | 19 |  |  | 546 |  |  | 19 |
Tax-exempt |  |  | 41,034 |  |  | 325 |  |  | 789 |  |  | 27 |  |  | 41,823 |  |  | 352 |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies |  |  | 877 |  |  | 7 |  |  | 5,119 |  |  | 24 |  |  | 5,996 |  |  | 31 |
U.S. Government-sponsored enterprises |  |  | 9,819 |  |  | 20 |  |  | 6,682 |  |  | 89 |  |  | 16,501 |  |  | 109 |
Total |  | $ | 54,736 |  | $ | 353 |  | $ | 13,136 |  | $ | 159 |  | $ | 67,872 |  | $ | 512 |
|  | Less Than 12 Months |  | 12 Months or More |  | Total |
|  | Fair |  | Unrealized |  | Fair |  | Unrealized |  | Fair |  | Unrealized |
December 31, 2014 |  | Value |  | Losses |  | Value |  | Losses |  | Value |  | Losses |
U.S. Government-sponsored enterprises |  | $ | 21,228 |  | $ | 33 |  | $ | 7,954 |  | $ | 49 |  | $ | 29,182 |  | $ | 82 |
State and municipals: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Taxable |  |  |  |  |  |  |  |  | 544 |  |  | 26 |  |  | 544 |  |  | 26 |
Tax-exempt |  |  | 4,702 |  |  | 23 |  |  | 2,423 |  |  | 39 |  |  | 7,125 |  |  | 62 |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies |  |  | 20,148 |  |  | 167 |  |  |  |  |  |  |  |  | 20,148 |  |  | 167 |
U.S. Government-sponsored enterprises |  |  | 22,870 |  |  | 226 |  |  |  |  |  |  |  |  | 22,870 |  |  | 226 |
Total |  | $ | 68,948 |  | $ | 449 |  | $ | 10,921 |  | $ | 114 |  | $ | 79,869 |  | $ | 563 |
Available-for-Sale Securities [Member] |
Maturity Distribution of Debt Securities |
|  | Fair |
September 30, 2015 |  | Value |
Within one year |  | $ | 33,161 |
After one but within five years |  |  | 98,388 |
After five but within ten years |  |  | 46,705 |
After ten years |  |  | 50,976 |
|  |  | 229,230 |
Mortgage-backed securities |  |  | 70,602 |
Total |  | $ | 299,832 |
Held-to-maturity Securities [Member] |
Maturity Distribution of Debt Securities |
|  | Amortized |  | Fair |
September 30, 2015 |  | Cost |  | Value |
Within one year |  |  |  |  |  |  |
After one but within five years |  | $ | 503 |  | $ | 515 |
After five but within ten years |  |  | — |  |  | — |
After ten years |  |  | 6,866 |  |  | 6,929 |
|  |  | 7,369 |  |  | 7,444 |
Mortgage-backed securities |  |  | 5,738 |  |  | 6,138 |
Total |  | $ | 13,107 |  | $ | 13,582 |

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