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Investment Securities (Tables) | 9 Months Ended
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Sep. 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 September 30, 2017 and December 31, 2016 are as follows:
(Dollars in thousands) |  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
September 30, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and U.S. government agencies |  | $ | 40,133 |  |  | $ | - |  |  | $ | 880 |  |  | $ | 39,253 |
Mortgage-backed U.S. government agencies |  |  | 27,370 |  |  |  | 11 |  |  |  | 335 |  |  |  | 27,046 |
State and political subdivision obligations |  |  | 28,393 |  |  |  | 35 |  |  |  | 450 |  |  |  | 27,978 |
Corporate debt securities |  |  | 1,000 |  |  |  | 5 |  |  |  | - |  |  |  | 1,005 |
Equity securities |  |  | 1,268 |  |  |  | 2 |  |  |  | 39 |  |  |  | 1,231 |
Total available-for-sale securities |  |  | 98,164 |  |  |  | 53 |  |  |  | 1,704 |  |  |  | 96,513 |
Held-to-maturity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and U.S. government agencies |  |  | 10,984 |  |  |  | 21 |  |  |  | 7 |  |  |  | 10,998 |
Mortgage-backed U.S. government agencies |  |  | 51,326 |  |  |  | 96 |  |  |  | 102 |  |  |  | 51,320 |
State and political subdivision obligations |  |  | 20,315 |  |  |  | 124 |  |  |  | 41 |  |  |  | 20,398 |
Corporate debt securities |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Equity securities |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Total held-to-maturity securities |  |  | 82,625 |  |  |  | 241 |  |  |  | 150 |  |  |  | 82,716 |
Total |  | $ | 180,789 |  |  | $ | 294 |  |  | $ | 1,854 |  |  | $ | 179,229 |
(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 Gross Realized Gains (Losses) on Sales of Available-For-Sale Securities | Gross realized gains and losses on sales of available-for-sale securities for the three and nine months ended September 30, 2017 and 2016 are shown in the table below.
(Dollars in thousands) | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
| 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Realized gains | $ | 46 |  |  | $ | 203 |  |  | $ | 246 |  |  | $ | 652 |
Realized losses |  | (24 | ) |  |  | (3 | ) |  |  | (204 | ) |  |  | (239 | )
Net gains | $ | 22 |  |  | $ | 200 |  |  | $ | 42 |  |  | $ | 413 |
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 September 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 |
September 30, 2017 |  | Securities |  | Value |  |  | Losses |  |  | Securities |  | Value |  |  | Losses |  |  | Securities |  | Value |  |  | Losses |
Available-for-sale securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and U.S. government agencies |  | 7 |  | $ | 15,790 |  |  | $ | 237 |  |  | 14 |  | $ | 23,462 |  |  | $ | 643 |  |  | 21 |  | $ | 39,252 |  |  | $ | 880 |
Mortgage-backed U.S. government agencies |  | 11 |  |  | 18,279 |  |  |  | 141 |  |  | 9 |  |  | 9,718 |  |  |  | 194 |  |  | 20 |  |  | 27,997 |  |  |  | 335 |
State and political subdivision obligations |  | 12 |  |  | 6,855 |  |  |  | 41 |  |  | 35 |  |  | 16,428 |  |  |  | 409 |  |  | 47 |  |  | 23,283 |  |  |  | 450 |
Equity securities |  | 0 |  |  | - |  |  |  | - |  |  | 1 |  |  | 511 |  |  |  | 39 |  |  | 1 |  |  | 511 |  |  |  | 39 |
Total temporarily impaired available-for-sale securities |  | 30 |  |  | 40,924 |  |  |  | 419 |  |  | 59 |  |  | 50,119 |  |  |  | 1,285 |  |  | 89 |  |  | 91,043 |  |  |  | 1,704 |
Held-to-maturity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and U.S. government agencies |  | 2 |  |  | 4,989 |  |  |  | 7 |  |  | 0 |  |  | - |  |  |  | - |  |  | 2 |  |  | 4,989 |  |  |  | 7 |
Mortgage-backed U.S. government agencies |  | 11 |  |  | 18,676 |  |  |  | 102 |  |  | 0 |  |  | - |  |  |  | - |  |  | 11 |  |  | 18,676 |  |  |  | 102 |
State and political subdivision obligations |  | 20 |  |  | 7,555 |  |  |  | 41 |  |  | 0 |  |  | - |  |  |  | - |  |  | 20 |  |  | 7,555 |  |  |  | 41 |
Total temporarily impaired held-to-maturity securities |  | 33 |  |  | 31,220 |  |  |  | 150 |  |  | 0 |  |  | - |  |  |  | - |  |  | 33 |  |  | 31,220 |  |  |  | 150 |
Total |  | 63 |  | $ | 72,144 |  |  | $ | 569 |  |  | 59 |  | $ | 50,119 |  |  | $ | 1,285 |  |  | 122 |  | $ | 122,263 |  |  | $ | 1,854 |
(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 | The table below illustrates the maturity distribution of investment securities at amortized cost and fair value as of September 30, 2017.
(Dollars in thousands) |  | Available-for-sale |  |  | Held-to-maturity |
|  | Amortized |  |  | Fair |  |  | Amortized |  |  | Fair |
September 30, 2017 |  | Cost |  |  | Value |  |  | Cost |  |  | Value |
Due in 1 year or less |  | $ | 596 |  |  | $ | 596 |  |  | $ | - |  |  | $ | - |
Due after 1 year but within 5 years |  |  | 12,542 |  |  |  | 12,446 |  |  |  | 19,332 |  |  |  | 19,421 |
Due after 5 years but within 10 years |  |  | 46,306 |  |  |  | 45,375 |  |  |  | 11,967 |  |  |  | 11,975 |
Due after 10 years |  |  | 10,082 |  |  |  | 9,819 |  |  |  | - |  |  |  | - |
|  |  | 69,526 |  |  |  | 68,236 |  |  |  | 31,299 |  |  |  | 31,396 |
Mortgage-backed securities |  |  | 27,370 |  |  |  | 27,046 |  |  |  | 51,326 |  |  |  | 51,320 |
Equity securities |  |  | 1,268 |  |  |  | 1,231 |  |  |  | - |  |  |  | - |
|  | $ | 98,164 |  |  | $ | 96,513 |  |  | $ | 82,625 |  |  | $ | 82,716 |

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