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Investment securities (Tables) | 3 Months Ended
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Mar. 31, 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 March 31, 2015 and December 31, 2014 are summarized as follows:
March 31, 2015 |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government-sponsored enterprises |  | $ | 95,683 |  |  | $ | 487 |  |  | $ | 22 |  |  | $ | 96,148 |
State and municipals: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Taxable |  |  | 16,447 |  |  |  | 1,063 |  |  |  | 15 |  |  |  | 17,495 |
Tax-exempt |  |  | 83,133 |  |  |  | 4,563 |  |  |  | 47 |  |  |  | 87,649 |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies |  |  | 35,339 |  |  |  | 154 |  |  |  | 93 |  |  |  | 35,400 |
U.S. Government-sponsored enterprises |  |  | 43,471 |  |  |  | 286 |  |  |  | 149 |  |  |  | 43,608 |
Total |  | $ | 274,073 |  |  | $ | 6,553 |  |  | $ | 326 |  |  | $ | 280,300 |
Held-to-maturity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax-exempt state and municipals |  | $ | 7,370 |  |  | $ | 103 |  |  | $ | 33 |  |  | $ | 7,440 |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies |  |  | 96 |  |  |  | 1 |  |  |  |  |  |  |  | 97 |
U.S. Government-sponsored enterprises |  |  | 6,706 |  |  |  | 486 |  |  |  |  |  |  |  | 7,192 |
Total |  | $ | 14,172 |  |  | $ | 590 |  |  | $ | 33 |  |  | $ | 14,729 |
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 |
Maturity Distribution of Debt Securities | The maturity distribution of the amortized cost and fair value, of debt securities classified as held-to-maturity at March 31, 2015, is summarized as follows:
March 31, 2015 |  | Amortized Cost |  |  | Fair Value |
Within one year |  |  |  |  |  |  |  |
After one but within five years |  | $ | 326 |  |  | $ | 334 |
After five but within ten years |  |  | 176 |  |  |  | 182 |
After ten years |  |  | 6,868 |  |  |  | 6,924 |
|  |  | 7,370 |  |  |  | 7,440 |
Mortgage-backed securities |  |  | 6,802 |  |  |  | 7,289 |
Total |  | $ | 14,172 |  |  | $ | 14,729 |
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 March 31, 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 |
March 31, 2015 |  | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses |  |  | Fair Value |  |  | Unrealized Losses |
U.S. Government-sponsored enterprises |  | $ | 7,970 |  |  | $ | 12 |  |  | $ | 2,999 |  |  | $ | 10 |  |  | $ | 10,969 |  |  | $ | 22 |
State and municipals: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Taxable |  |  |  |  |  |  |  |  |  |  | 554 |  |  |  | 15 |  |  |  | 554 |  |  |  | 15 |
Tax-exempt |  |  | 14,234 |  |  |  | 61 |  |  |  | 787 |  |  |  | 19 |  |  |  | 15,021 |  |  |  | 80 |
Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies |  |  | 14,885 |  |  |  | 62 |  |  |  | 3,790 |  |  |  | 31 |  |  |  | 18,675 |  |  |  | 93 |
U.S. Government-sponsored enterprises |  |  | 19,098 |  |  |  | 149 |  |  |  |  |  |  |  |  |  |  |  | 19,098 |  |  |  | 149 |
Total |  | $ | 56,187 |  |  | $ | 284 |  |  | $ | 8,130 |  |  | $ | 75 |  |  | $ | 64,317 |  |  | $ | 359 |
|  | 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 March 31, 2015, is summarized as follows:
March 31, 2015 |  | Fair Value |
Within one year |  | $ | 32,644 |
After one but within five years |  |  | 80,316 |
After five but within ten years |  |  | 28,954 |
After ten years |  |  | 59,378 |
|  |  | 201,292 |
Mortgage-backed securities |  |  | 79,008 |
Total |  | $ | 280,300 |

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