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Investment securities (Tables) | 9 Months Ended
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Sep. 30, 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 September 30, 2014 and December 31, 2013 are summarized as follows:
September 30, 2014 |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 48,357 |  |  |  |  |  |  | $ | 296 |  |  | $ | 48,061 |
U.S. Government-sponsored enterprises |  |  | 101,294 |  |  | $ | 186 |  |  |  | 228 |  |  |  | 101,252 |
State and municipals: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Taxable |  |  | 16,534 |  |  |  | 727 |  |  |  | 25 |  |  |  | 17,236 |
Tax-exempt |  |  | 89,340 |  |  |  | 4,782 |  |  |  | 16 |  |  |  | 94,106 |
Corporate debt securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies |  |  | 39,677 |  |  |  | 121 |  |  |  | 287 |  |  |  | 39,511 |
U.S. Government-sponsored enterprises |  |  | 50,863 |  |  |  | 247 |  |  |  | 451 |  |  |  | 50,659 |
Common equity securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total |  | $ | 346,065 |  |  | $ | 6,063 |  |  | $ | 1,303 |  |  | $ | 350,825 |
Held-to-maturity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
State and municipals: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Taxable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax-exempt |  | $ | 7,370 |  |  | $ | 14 |  |  | $ | 207 |  |  | $ | 7,177 |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies |  |  | 104 |  |  |  | 2 |  |  |  |  |  |  |  | 106 |
U.S. Government-sponsored enterprises |  |  | 7,790 |  |  |  | 443 |  |  |  |  |  |  |  | 8,233 |
Total |  | $ | 15,264 |  |  | $ | 459 |  |  | $ | 207 |  |  | $ | 15,516 |
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: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
State and municipals: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Taxable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax-exempt |  | $ | 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 September 30, 2014, is summarized as follows:
September 30, 2014 |  | Amortized Cost |  |  | Fair Value |
Within one year |  |  |  |  |  |  |  |
After one but within five years |  | $ | 325 |  |  | $ | 333 |
After five but within ten years |  |  | 176 |  |  |  | 182 |
After ten years |  |  | 6,869 |  |  |  | 6,662 |
|  |  | 7,370 |  |  |  | 7,177 |
Mortgage-backed securities |  |  | 7,894 |  |  |  | 8,339 |
Total |  | $ | 15,264 |  |  | $ | 15,516 |
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 September 30, 2014 and December 31, 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 |
September 30, 2014 |  | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses |
U.S. Treasury securities |  | $ | 48,061 |  |  | $ | 296 |  |  |  |  |  |  |  |  |  |  | $ | 48,061 |  |  | $ | 296 |
U.S. Government-sponsored enterprises |  |  | 32,649 |  |  |  | 74 |  |  | $ | 20,940 |  |  | $ | 154 |  |  |  | 53,589 |  |  |  | 228 |
State and municipals: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Taxable |  |  | 1,599 |  |  |  | 25 |  |  |  |  |  |  |  |  |  |  |  | 1,599 |  |  |  | 25 |
Tax-exempt |  |  | 8,417 |  |  |  | 35 |  |  |  | 4,776 |  |  |  | 188 |  |  |  | 13,193 |  |  |  | 223 |
Corporate debt securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies |  |  | 26,466 |  |  |  | 287 |  |  |  |  |  |  |  |  |  |  |  | 26,466 |  |  |  | 287 |
U.S. Government-sponsored enterprises |  |  | 29,382 |  |  |  | 451 |  |  |  |  |  |  |  |  |  |  |  | 29,382 |  |  |  | 451 |
Common equity securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total |  | $ | 146,574 |  |  | $ | 1,168 |  |  | $ | 25,716 |  |  | $ | 342 |  |  | $ | 172,290 |  |  | $ | 1,510 |
|  | 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 September 30, 2014, is summarized as follows:
September 30, 2014 |  | Fair Value |
Within one year |  | $ | 28,889 |
After one but within five years |  |  | 132,467 |
After five but within ten years |  |  | 32,136 |
After ten years |  |  | 67,163 |
|  |  | 260,655 |
Mortgage-backed securities |  |  | 90,170 |
Total |  | $ | 350,825 |

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- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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