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Investment securities (Tables) | 6 Months Ended
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Jun. 30, 2015
Amortized Cost and Fair Value of Investment Securities Aggregated by Investment Category | The amortized cost and fair value of investment securities aggregated by investment category at June 30, 2015 and December 31, 2014 are summarized as follows:
June 30 2015 |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 30,631 |  |  | $ | 84 |  |  | $ | 30 |  |  | $ | 30,685 |
U.S. Government-sponsored enterprises |  |  | 85,377 |  |  |  | 490 |  |  |  | 5 |  |  |  | 85,862 |
State and municipals: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Taxable |  |  | 15,930 |  |  |  | 804 |  |  |  | 22 |  |  |  | 16,712 |
Tax-exempt |  |  | 109,241 |  |  |  | 3,886 |  |  |  | 613 |  |  |  | 112,514 |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies |  |  | 32,995 |  |  |  | 156 |  |  |  | 62 |  |  |  | 33,089 |
U.S. Government-sponsored enterprises |  |  | 39,848 |  |  |  | 250 |  |  |  | 170 |  |  |  | 39,928 |
Total |  | $ | 314,022 |  |  | $ | 5,670 |  |  | $ | 902 |  |  | $ | 318,790 |
Held-to-maturity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
State and municipals Tax-exempt |  | $ | 7,369 |  |  | $ | 103 |  |  | $ | 53 |  |  | $ | 7,419 |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies |  |  | 93 |  |  |  | 1 |  |  |  |  |  |  |  | 94 |
U.S. Government-sponsored enterprises |  |  | 6,164 |  |  |  | 427 |  |  |  |  |  |  |  | 6,591 |
Total |  | $ | 13,626 |  |  | $ | 531 |  |  | $ | 53 |  |  | $ | 14,104 |
December 31, 2014 |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair 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 | The fair value and gross unrealized losses of investment securities with unrealized losses for which an other-than-temporary impairment (“OTTI”) has not been recognized at June 30, 2015 and December 31, 2014, aggregated by investment category and length of time that the individual securities have been in a continuous unrealized loss position, are summarized as follows:
|  | Less Than 12 Months |  |  | 12 Months or More |  |  | Total |
June 30, 2015 |  | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses |
U.S. Treasury securities |  | $ | 10,044 |  |  | $ | 30 |  |  |  |  |  |  |  |  |  |  | $ | 10,044 |  |  | $ | 30 |
U.S. Government-sponsored enterprises |  |  | 3,003 |  |  |  | 5 |  |  |  |  |  |  |  |  |  |  |  | 3,003 |  |  |  | 5 |
State and municipals: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Taxable |  |  |  |  |  |  |  |  |  | $ | 545 |  |  | $ | 22 |  |  |  | 545 |  |  |  | 22 |
Tax-exempt |  |  | 44,196 |  |  |  | 636 |  |  |  | 786 |  |  |  | 30 |  |  |  | 44,982 |  |  |  | 666 |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies |  |  | 7,457 |  |  |  | 26 |  |  |  | 5,402 |  |  |  | 36 |  |  |  | 12,859 |  |  |  | 62 |
U.S. Government-sponsored enterprises |  |  | 13,785 |  |  |  | 68 |  |  |  | 3,721 |  |  |  | 102 |  |  |  | 17,506 |  |  |  | 170 |
Total |  | $ | 78,485 |  |  | $ | 765 |  |  | $ | 10,454 |  |  | $ | 190 |  |  | $ | 88,939 |  |  | $ | 955 |
|  | Less Than 12 Months |  |  | 12 Months or More |  |  | Total |
December 31, 2014 |  | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized 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 | The maturity distribution of the fair value, which is the net carrying amount, of the debt securities classified as available-for-sale at June 30, 2015, is summarized as follows:
June 30, 2015 |  | Fair Value |
Within one year |  | $ | 28,289 |
After one but within five years |  |  | 108,675 |
After five but within ten years |  |  | 54,059 |
After ten years |  |  | 54,750 |
|  |  | 245,773 |
Mortgage-backed securities |  |  | 73,017 |
Total |  | $ | 318,790 |
Held-to-maturity Securities [Member] |
Maturity Distribution of Debt Securities | The maturity distribution of the amortized cost and fair value, of debt securities classified as held-to-maturity at June 30, 2015, is summarized as follows:
June 30, 2015 |  | Amortized Cost |  |  | Fair Value |
Within one year |  |  |  |  |  |  |  |
After one but within five years |  | $ | 326 |  |  | $ | 330 |
After five but within ten years |  |  | 176 |  |  |  | 180 |
After ten years |  |  | 6,867 |  |  |  | 6,909 |
|  |  | 7,369 |  |  |  | 7,419 |
Mortgage-backed securities |  |  | 6,257 |  |  |  | 6,685 |
Total |  | $ | 13,626 |  |  | $ | 14,104 |

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