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Investment securities (Tables) | 3 Months Ended
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Mar. 31, 2018
Schedule of amortized cost and fair value of investment securities aggregated by investment category |
|  |  |  |  | Gross |  | Gross |  |  |  |
|  | Amortized |  | Unrealized |  | Unrealized |  | Fair |
March 31, 2018 |  | Cost |  | Gains |  | Losses |  | Value |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 25,927 |  | $ | 7 |  | $ | 458 |  | $ | 25,476 |
U.S. Government-sponsored enterprises |  |  | 95,268 |  |  | 6 |  |  | 2,777 |  |  | 92,497 |
State and municipals: |  |  |  |  |  |  |  |  |  |  |  |  |
Taxable |  |  | 14,525 |  |  | 383 |  |  |  |  |  | 14,908 |
Tax-exempt |  |  | 97,705 |  |  | 864 |  |  | 875 |  |  | 97,694 |
Residential Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies |  |  | 13,135 |  |  | 1 |  |  | 106 |  |  | 13,030 |
U.S. Government-sponsored enterprises |  |  | 22,127 |  |  | 3 |  |  | 397 |  |  | 21,733 |
Commercial Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government-sponsored enterprises |  |  | 6,303 |  |  |  |  |  | 263 |  |  | 6,040 |
Total |  | $ | 274,990 |  | $ | 1,264 |  | $ | 4,876 |  | $ | 271,378 |
Held-to-maturity: |  |  |  |  |  |  |  |  |  |  |  |  |
Tax-exempt state and municipals |  | $ | 6,858 |  | $ | 24 |  | $ | 57 |  | $ | 6,825 |
Residential Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies |  |  | 51 |  |  |  |  |  |  |  |  | 51 |
U.S. Government-sponsored enterprises |  |  | 2,119 |  |  | 114 |  |  | 5 |  |  | 2,228 |
Total |  | $ | 9,028 |  | $ | 138 |  | $ | 62 |  | $ | 9,104 |
|  |  |  |  | Gross |  | Gross |  |  |  |
|  | Amortized |  | Unrealized |  | Unrealized |  | Fair |
December 31, 2017 |  | Cost |  | Gains |  | Losses |  | Value |
Available-for-sale: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury securities |  | $ | 20,042 |  |  |  |  | $ | 228 |  | $ | 19,814 |
U.S. Government-sponsored enterprises |  |  | 95,358 |  | $ | 30 |  |  | 1,740 |  |  | 93,648 |
State and municipals: |  |  |  |  |  |  |  |  |  |  |  |  |
Taxable |  |  | 14,559 |  |  | 488 |  |  |  |  |  | 15,047 |
Tax-exempt |  |  | 103,199 |  |  | 1,136 |  |  | 502 |  |  | 103,833 |
Residential Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies |  |  | 14,517 |  |  | 2 |  |  | 85 |  |  | 14,434 |
U.S. Government-sponsored enterprises |  |  | 19,752 |  |  | 10 |  |  | 231 |  |  | 19,531 |
Commercial Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government-sponsored enterprises |  |  | 6,315 |  |  |  |  |  | 120 |  |  | 6,195 |
Equity securities |  |  |  |  |  |  |  |  |  |  |  |  |
Common |  |  | 43 |  |  | 3 |  |  |  |  |  | 46 |
Total |  | $ | 273,785 |  | $ | 1,669 |  | $ | 2,906 |  | $ | 272,548 |
Held-to-maturity: |  |  |  |  |  |  |  |  |  |  |  |  |
Tax-exempt state and municipals |  | $ | 6,859 |  | $ | 152 |  | $ | 13 |  | $ | 6,998 |
Residential Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies |  |  | 54 |  |  |  |  |  |  |  |  | 54 |
U.S. Government-sponsored enterprises |  |  | 2,361 |  |  | 138 |  |  | 4 |  |  | 2,495 |
Total |  | $ | 9,274 |  | $ | 290 |  | $ | 17 |  | $ | 9,547 |
Schedule of 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 |
March 31, 2018 |  | Value |  | Losses |  | Value |  | Losses |  | Value |  | Losses |
U.S. Treasury securities |  | $ | 19,143 |  | $ | 366 |  | $ | 2,429 |  | $ | 92 |  | $ | 21,572 |  | $ | 458 |
U.S. Government-sponsored enterprises |  |  | 39,607 |  |  | 950 |  |  | 50,763 |  |  | 1,827 |  |  | 90,370 |  |  | 2,777 |
State and municipals: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax-exempt |  |  | 61,928 |  |  | 844 |  |  | 4,109 |  |  | 88 |  |  | 66,037 |  |  | 932 |
Residential Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies |  |  | 9,190 |  |  | 54 |  |  | 3,592 |  |  | 52 |  |  | 12,782 |  |  | 106 |
U.S. Government-sponsored enterprises |  |  | 15,644 |  |  | 257 |  |  | 5,429 |  |  | 145 |  |  | 21,073 |  |  | 402 |
Commercial Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government-sponsored enterprises |  |  | 6,303 |  |  | 263 |  |  |  |  |  |  |  |  | 6,303 |  |  | 263 |
Total |  | $ | 151,815 |  | $ | 2,734 |  | $ | 66,322 |  | $ | 2,204 |  | $ | 218,137 |  | $ | 4,938 |
|  | Less Than 12 Months |  | 12 Months or More |  | Total |
|  | Fair |  | Unrealized |  | Fair |  | Unrealized |  | Fair |  | Unrealized |
December 31, 2017 |  | Value |  | Losses |  | Value |  | Losses |  | Value |  | Losses |
U.S. Treasury securities |  | $ | 17,350 |  | $ | 170 |  | $ | 2,464 |  | $ | 58 |  | $ | 19,814 |  | $ | 228 |
U.S. Government-sponsored enterprises |  |  | 39,096 |  |  | 445 |  |  | 51,365 |  |  | 1,295 |  |  | 90,461 |  |  | 1,740 |
State and municipals: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax-exempt |  |  | 54,788 |  |  | 454 |  |  | 3,808 |  |  | 61 |  |  | 58,596 |  |  | 515 |
Residential Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agencies |  |  | 9,484 |  |  | 39 |  |  | 3,968 |  |  | 46 |  |  | 13,452 |  |  | 85 |
U.S. Government-sponsored enterprises |  |  | 12,537 |  |  | 103 |  |  | 6,504 |  |  | 132 |  |  | 19,041 |  |  | 235 |
Commercial Mortgage-backed securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government-sponsored enterprises |  |  | 6,195 |  |  | 120 |  |  |  |  |  |  |  |  | 6,195 |  |  | 120 |
Total |  | $ | 139,450 |  | $ | 1,331 |  | $ | 68,109 |  | $ | 1,592 |  | $ | 207,559 |  | $ | 2,923 |
Summary of unrealized and realized gains and losses | The following is a summary of unrealized and realized gains and losses recognized in net income on equity securities during the three months ended March 31, 2018 (in thousands):
|  |  | Three months ended
March 31, 2018 |  |  | March 31, 2018
Net gains and (losses) recognized during the period on equity securities |  | $ | (8)
Less: Net gains and (losses) recognized during the period on equity securities sold during the period |  |  |
Unrealized gains and (losses) recognized during the reporting period on equity securities still held at the reporting date |  | $ | (8)
Available-for-Sale Securities. |
Schedule of maturity distribution of fair value |
|  | Fair |
March 31, 2018 |  | Value |
Within one year |  | $ | 17,927 |
After one but within five years |  |  | 164,920 |
After five but within ten years |  |  | 32,389 |
After ten years |  |  | 15,339 |
|  |  | 230,575 |
Mortgage-backed securities |  |  | 40,803 |
Total |  | $ | 271,378 |
Held-to-maturity Securities. |
Schedule of maturity distribution of fair value |
|  | Amortized |  | Fair |
March 31, 2018 |  | Cost |  | Value |
Within one year |  |  |  |  |  |  |
After one but within five years |  |  |  |  |  |  |
After five but within ten years |  |  |  |  |  |  |
After ten years |  | $ | 6,858 |  | $ | 6,825 |
|  |  | 6,858 |  |  | 6,825 |
Mortgage-backed securities |  |  | 2,170 |  |  | 2,279 |
Total |  | $ | 9,028 |  | $ | 9,104 |

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