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Investment Securities (Tables) | 6 Months Ended
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Jun. 30, 2017
Securities Financing Transactions Disclosures [Abstract] |
Unrealized Gain (Loss) on Investments | The amortized cost, fair value, and unrealized gains and losses on investment securities at June 30, 2017 and December 31, 2016 are as follows:
(Dollars in thousands) |  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
June 30, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and U.S. government agencies |  | $ | 42,629 |  |  | $ | - |  |  | $ | 858 |  |  | $ | 41,771 |
Mortgage-backed U.S. government agencies |  |  | 28,543 |  |  |  | 3 |  |  |  | 307 |  |  |  | 28,239 |
State and political subdivision obligations |  |  | 39,539 |  |  |  | 70 |  |  |  | 514 |  |  |  | 39,095 |
Corporate debt securities |  |  | 1,100 |  |  |  | 5 |  |  |  | - |  |  |  | 1,105 |
Equity securities |  |  | 1,168 |  |  |  | 15 |  |  |  | 40 |  |  |  | 1,143 |
Total available-for-sale securities |  |  | 112,979 |  |  |  | 93 |  |  |  | 1,719 |  |  |  | 111,353 |
Held-to-maturity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and U.S. government agencies |  |  | 10,984 |  |  |  | 24 |  |  |  | 5 |  |  |  | 11,003 |
Mortgage-backed U.S. government agencies |  |  | 51,248 |  |  |  | 72 |  |  |  | 99 |  |  |  | 51,221 |
State and political subdivision obligations |  |  | 8,864 |  |  |  | 120 |  |  |  | 9 |  |  |  | 8,975 |
Corporate debt securities |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Equity securities |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Total held-to-maturity securities |  |  | 71,096 |  |  |  | 216 |  |  |  | 113 |  |  |  | 71,199 |
Total |  | $ | 184,075 |  |  | $ | 309 |  |  | $ | 1,832 |  |  | $ | 182,552 |
(Dollars in thousands) |  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and U.S. government agencies |  | $ | 48,520 |  |  | $ | 34 |  |  | $ | 1,542 |  |  | $ | 47,012 |
Mortgage-backed U.S. government agencies |  |  | 26,181 |  |  |  | 17 |  |  |  | 579 |  |  |  | 25,619 |
State and political subdivision obligations |  |  | 61,079 |  |  |  | 91 |  |  |  | 2,332 |  |  |  | 58,838 |
Corporate debt securities |  |  | 1,100 |  |  |  | - |  |  |  | - |  |  |  | 1,100 |
Equity securities |  |  | 1,168 |  |  |  | - |  |  |  | 112 |  |  |  | 1,056 |
Total available-for-sale securities |  | $ | 138,048 |  |  | $ | 142 |  |  | $ | 4,565 |  |  | $ | 133,625 |
Schedule of Fair Value and Unrealized Loss on Investments in a Continuous Unrealized Loss Position | The following tables present gross unrealized losses and fair value of investments aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position at June 30, 2017 and December 31, 2016.
(Dollars in thousands) |  | Less Than 12 Months |  |  | 12 Months or More |  |  | Total |
|  | Number |  |  |  |  |  |  |  |  |  | Number |  |  |  |  |  |  |  |  |  | Number |  |  |  |  |  |  |  |
|  | of |  | Fair |  |  | Unrealized |  |  | of |  | Fair |  |  | Unrealized |  |  | of |  | Fair |  |  | Unrealized |
June 30, 2017 |  | Securities |  | Value |  |  | Losses |  |  | Securities |  | Value |  |  | Losses |  |  | Securities |  | Value |  |  | Losses |
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and U.S. government agencies |  | 21 |  | $ | 39,077 |  |  | $ | 852 |  |  | 1 |  | $ | 2,694 |  |  | $ | 6 |  |  | 22 |  | $ | 41,771 |  |  | $ | 858 |
Mortgage-backed U.S. government agencies |  | 18 |  |  | 26,466 |  |  |  | 291 |  |  | 1 |  |  | 535 |  |  |  | 16 |  |  | 19 |  |  | 27,001 |  |  |  | 307 |
State and political subdivision obligations |  | 48 |  |  | 24,121 |  |  |  | 381 |  |  | 7 |  |  | 3,845 |  |  |  | 133 |  |  | 55 |  |  | 27,966 |  |  |  | 514 |
Equity securities |  | 0 |  |  | - |  |  |  | - |  |  | 1 |  |  | 550 |  |  |  | 40 |  |  | 1 |  |  | 550 |  |  |  | 40 |
Total temporarily impaired available-for-sale securities |  | 87 |  |  | 89,664 |  |  |  | 1,524 |  |  | 10 |  |  | 7,624 |  |  |  | 195 |  |  | 97 |  |  | 97,288 |  |  |  | 1,719 |
Held-to-maturity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and U.S. government agencies |  | 2 |  |  | 4,991 |  |  |  | 5 |  |  | 0 |  |  | - |  |  |  | - |  |  | 2 |  |  | 4,991 |  |  |  | 5 |
Mortgage-backed U.S. government agencies |  | 14 |  |  | 22,879 |  |  |  | 99 |  |  | 0 |  |  | - |  |  |  | - |  |  | 14 |  |  | 22,879 |  |  |  | 99 |
State and political subdivision obligations |  | 3 |  |  | 1,536 |  |  |  | 9 |  |  | 0 |  |  | - |  |  |  | - |  |  | 3 |  |  | 1,536 |  |  |  | 9 |
Total temporarily impaired held-to-maturity securities |  | 19 |  |  | 29,406 |  |  |  | 113 |  |  | 0 |  |  | - |  |  |  | - |  |  | 19 |  |  | 29,406 |  |  |  | 113 |
Total |  | 106 |  | $ | 119,070 |  |  | $ | 1,637 |  |  | 10 |  | $ | 7,624 |  |  | $ | 195 |  |  | 116 |  | $ | 126,694 |  |  | $ | 1,832 |
(Dollars in thousands) |  | Less Than 12 Months |  |  | 12 Months or More |  |  | Total |
|  | Number |  |  |  |  |  |  |  |  |  | Number |  |  |  |  |  |  |  |  |  | Number |  |  |  |  |  |  |  |
|  | of |  | Fair |  |  | Unrealized |  |  | of |  | Fair |  | Unrealized |  |  | of |  | Fair |  |  | Unrealized |
December 31, 2016 |  | Securities |  | Value |  |  | Losses |  |  | Securities |  | Value |  | Losses |  |  | Securities |  | Value |  |  | Losses |
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and U.S. government agencies |  | 23 |  | $ | 43,698 |  |  | $ | 1,542 |  |  | 0 |  | $ | - |  |  | $ | - |  |  | 23 |  | $ | 43,698 |  |  | $ | 1,542 |
Mortgage-backed U.S. government agencies |  | 18 |  |  | 24,321 |  |  |  | 579 |  |  | 0 |  |  | - |  |  |  | - |  |  | 18 |  |  | 24,321 |  |  |  | 579 |
State and political subdivision obligations |  | 108 |  |  | 50,582 |  |  |  | 2,332 |  |  | 0 |  |  | - |  |  |  | - |  |  | 108 |  |  | 50,582 |  |  |  | 2,332 |
Equity securities |  | 0 |  |  | - |  |  |  | - |  |  | 2 |  |  | 1,056 |  |  |  | 112 |  |  | 2 |  |  | 1,056 |  |  |  | 112 |
Total temporarily impaired available-for-sale securities |  | 149 |  | $ | 118,601 |  |  | $ | 4,453 |  |  | 2 |  | $ | 1,056 |  |  | $ | 112 |  |  | 151 |  | $ | 119,657 |  |  | $ | 4,565 |
Investments Classified by Contractual Maturity Date |
(Dollars in thousands) |  | Available-for-sale |  |  | Held-to-maturity |
|  | Amortized |  |  | Fair |  |  | Amortized |  |  | Fair |
June 30, 2017 |  | Cost |  |  | Value |  |  | Cost |  |  | Value |
Due in 1 year or less |  | $ | 1,293 |  |  | $ | 1,292 |  |  | $ | - |  |  | $ | - |
Due after 1 year but within 5 years |  |  | 20,311 |  |  |  | 20,178 |  |  |  | 14,486 |  |  |  | 14,546 |
Due after 5 years but within 10 years |  |  | 47,618 |  |  |  | 46,801 |  |  |  | 5,362 |  |  |  | 5,432 |
Due after 10 years |  |  | 14,046 |  |  |  | 13,700 |  |  |  | - |  |  |  | - |
|  |  | 83,268 |  |  |  | 81,971 |  |  |  | 19,848 |  |  |  | 19,978 |
Mortgage-backed securities |  |  | 28,543 |  |  |  | 28,239 |  |  |  | 51,248 |  |  |  | 51,221 |
Equity securities |  |  | 1,168 |  |  |  | 1,143 |  |  |  | - |  |  |  | - |
|  | $ | 112,979 |  |  | $ | 111,353 |  |  | $ | 71,096 |  |  | $ | 71,199 |

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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=82897076&loc=d3e27290-111563 + Details
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