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Investment securities (Tables) | 12 Months Ended
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Dec. 31, 2014
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 December 31, 2014 and 2013 are summarized as follows:
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 |
December 31, 2013 |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government-sponsored enterprises |  | $ | 113,221 |  |  | $ | 296 |  |  | $ | 472 |  |  | $ | 113,045 |
State and municipals: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Taxable |  |  | 16,664 |  |  |  | 160 |  |  |  | 126 |  |  |  | 16,698 |
Tax-exempt |  |  | 96,194 |  |  |  | 2,267 |  |  |  | 380 |  |  |  | 98,081 |
Corporate debt securities |  |  | 4,433 |  |  |  | 32 |  |  |  | 78 |  |  |  | 4,387 |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies |  |  | 20,386 |  |  |  | 113 |  |  |  | 66 |  |  |  | 20,433 |
U.S. Government-sponsored enterprises |  |  | 45,251 |  |  |  | 763 |  |  |  | 40 |  |  |  | 45,974 |
Common equity securities |  |  | 756 |  |  |  | 351 |  |  |  | 10 |  |  |  | 1,097 |
Total |  | $ | 296,905 |  |  | $ | 3,982 |  |  | $ | 1,172 |  |  | $ | 299,715 |
Held-to-maturity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax-exempt state and municipals |  | $ | 7,372 |  |  | $ | 11 |  |  | $ | 777 |  |  | $ | 6,606 |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies |  |  | 117 |  |  |  | 2 |  |  |  |  |  |  |  | 119 |
U.S. Government-sponsored enterprises |  |  | 9,806 |  |  |  | 644 |  |  |  |  |  |  |  | 10,450 |
Total |  | $ | 17,295 |  |  | $ | 657 |  |  | $ | 777 |  |  | $ | 17,175 |
Maturity Distribution of Debt Securities | The maturity distribution of the amortized cost and fair value, of debt securities classified as held-to-maturity at December 31, 2014, is summarized as follows:
December 31, 2014 |  | Amortized Cost |  |  | Fair Value |
Within one year |  |  |  |  |  |  |  |
After one but within five years |  | $ | 325 |  |  | $ | 330 |
After five but within ten years |  |  | 176 |  |  |  | 180 |
After ten years |  |  | 6,869 |  |  |  | 6,927 |
|  |  | 7,370 |  |  |  | 7,437 |
Mortgage-backed securities |  |  | 7,295 |  |  |  | 7,778 |
Total |  | $ | 14,665 |  |  | $ | 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 OTTI has not been recognized at December 31, 2014 and 2013, 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 |
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 |
|  | Less Than 12 Months |  |  | 12 Months or More |  |  | Total |
December 31, 2013 |  | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses |
U.S. Government-sponsored enterprises |  | $ | 66,391 |  |  | $ | 468 |  |  | $ | 3,114 |  |  | $ | 4 |  |  | $ | 69,505 |  |  | $ | 472 |
State and municipals: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Taxable |  |  | 10,621 |  |  |  | 126 |  |  |  |  |  |  |  |  |  |  |  | 10,621 |  |  |  | 126 |
Tax-exempt |  |  | 36,471 |  |  |  | 1,157 |  |  |  |  |  |  |  |  |  |  |  | 36,471 |  |  |  | 1,157 |
Corporate debt securities |  |  | 1,095 |  |  |  | 78 |  |  |  |  |  |  |  |  |  |  |  | 1,095 |  |  |  | 78 |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies |  |  | 12,978 |  |  |  | 66 |  |  |  |  |  |  |  |  |  |  |  | 12,978 |  |  |  | 66 |
U.S. Government-sponsored enterprises |  |  | 5,624 |  |  |  | 40 |  |  |  |  |  |  |  |  |  |  |  | 5,624 |  |  |  | 40 |
Common equity securities |  |  | 137 |  |  |  | 10 |  |  |  |  |  |  |  |  |  |  |  | 137 |  |  |  | 10 |
Total |  | $ | 133,317 |  |  | $ | 1,945 |  |  | $ | 3,114 |  |  | $ | 4 |  |  | $ | 136,431 |  |  | $ | 1,949 |
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 December 31, 2014, is summarized as follows:
December 31, 2014 |  | Fair Value |
Within one year |  | $ | 29,295 |
After one but within five years |  |  | 129,867 |
After five but within ten years |  |  | 29,803 |
After ten years |  |  | 66,138 |
|  |  | 255,103 |
Mortgage-backed securities |  |  | 84,483 |
Total |  | $ | 339,586 |

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