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Investment Securities (Tables) | 9 Months Ended
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Sep. 30, 2017
Investments Debt And Equity Securities [Abstract] |
Summary of Amortized Cost and Fair Value of Securities Available for Sale and Held to Maturity | The following table summarizes the amortized cost and fair value of securities available for sale and held to maturity at September 30, 2017 and December 31, 2016, and the corresponding amounts of gross unrealized gains and losses recognized in accumulated other comprehensive income:
|  |  |  |  |  | Gross |  |  | Gross |  |  |  |  |
(dollars in thousands) |  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
September 30, 2017 |  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
Available for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Government agency securities |  | $ | 5,057 |  |  | $ | — |  |  | $ | (100 | ) |  | $ | 4,957 |
Mortgage-backed securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Government sponsored agencies |  |  | 33,530 |  |  |  | 44 |  |  |  | (318 | ) |  |  | 33,256 |
Corporate debt securities |  |  | 17,341 |  |  |  | 203 |  |  |  | (60 | ) |  |  | 17,484 |
|  | $ | 55,928 |  |  | $ | 247 |  |  | $ | (478 | ) |  | $ | 55,697 |
Held to maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal taxable securities |  | $ | 4,296 |  |  | $ | 278 |  |  | $ | — |  |  | $ | 4,574 |
Municipal securities |  |  | 895 |  |  |  | 16 |  |  |  | — |  |  |  | 911 |
|  | $ | 5,191 |  |  | $ | 294 |  |  | $ | — |  |  | $ | 5,485 |
December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available for sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Government agency securities |  | $ | 5,453 |  |  | $ | — |  |  | $ | (136 | ) |  | $ | 5,317 |
Mortgage-backed securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Government sponsored agencies |  |  | 23,913 |  |  |  | 38 |  |  |  | (311 | ) |  |  | 23,640 |
Corporate debt securities |  |  | 10,364 |  |  |  | 21 |  |  |  | (65 | ) |  |  | 10,320 |
|  | $ | 39,730 |  |  | $ | 59 |  |  | $ | (512 | ) |  | $ | 39,277 |
Held to maturity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Municipal taxable securities |  | $ | 5,301 |  |  | $ | 328 |  |  | $ | — |  |  | $ | 5,629 |
Municipal securities |  |  | 913 |  |  |  | 11 |  |  |  | — |  |  |  | 924 |
|  | $ | 6,214 |  |  | $ | 339 |  |  | $ | — |  |  | $ | 6,553 |
Amortized Cost and Fair Value of Investment Securities Portfolio Expected Maturity | The amortized cost and fair value of the investment securities portfolio at September 30, 2017 are shown by expected maturity below. Expected maturities may differ from contractual maturities if borrowers have the right to call or prepay obligations with or without call or prepayment penalties.
|  | Available for Sale |  |  | Held to Maturity |
|  | Amortized |  |  | Fair |  |  | Amortized |  |  | Fair |
(dollars in thousands) |  | Cost |  |  | Value |  |  | Cost |  |  | Value |
Due from one to five years |  | $ | 31,323 |  |  | $ | 31,214 |  |  | $ | 2,781 |  |  | $ | 2,930 |
Due from five to ten years |  |  | 20,556 |  |  |  | 20,473 |  |  |  | 2,410 |  |  |  | 2,555 |
Due from ten years and greater |  |  | 4,049 |  |  |  | 4,010 |  |  |  | — |  |  |  | — |
|  | $ | 55,928 |  |  | $ | 55,697 |  |  | $ | 5,191 |  |  | $ | 5,485 |
Summary of Available for Sale Securities With Unrealized Losses | The following table summarizes available for sale securities with unrealized losses at September 30, 2017 and December 31, 2016, aggregated by major security type and length of time in a continuous unrealized loss position. There were no held to maturity securities in a continuous unrealized loss position at September 30, 2017 and December 31, 2016:
|  | Less than Twelve Months |  |  | Twelve Months or More |  |  | Total |
|  | Unrealized |  |  | Estimated |  |  | Unrealized |  |  | Estimated |  |  | Unrealized |  |  | Estimated |
(dollars in thousands) |  | Losses |  |  | Fair Value |  |  | Losses |  |  | Fair Value |  |  | Losses |  |  | Fair Value |
September 30, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Government agency securities |  | $ | (100 | ) |  | $ | 4,957 |  |  | $ | — |  |  | $ | — |  |  | $ | (100 | ) |  | $ | 4,957 |
Mortgage-backed securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Government sponsored agencies |  |  | (255 | ) |  |  | 26,916 |  |  |  | (63 | ) |  |  | 2,105 |  |  |  | (318 | ) |  |  | 29,021 |
Corporate debt securities |  |  | (60 | ) |  |  | 5,994 |  |  |  | — |  |  |  | — |  |  |  | (60 | ) |  |  | 5,994 |
Total available for sale |  | $ | (415 | ) |  | $ | 37,867 |  |  | $ | (63 | ) |  | $ | 2,105 |  |  | $ | (478 | ) |  | $ | 39,972 |
December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Government agency securities |  | $ | (136 | ) |  | $ | 5,317 |  |  | $ | — |  |  | $ | — |  |  | $ | (136 | ) |  | $ | 5,317 |
Mortgage-backed securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Government sponsored agencies |  |  | (221 | ) |  |  | 16,231 |  |  |  | (90 | ) |  |  | 2,504 |  |  |  | (311 | ) |  |  | 18,735 |
Corporate debt securities |  |  | (65 | ) |  |  | 5,147 |  |  |  | — |  |  |  | — |  |  |  | (65 | ) |  |  | 5,147 |
Total available for sale |  | $ | (422 | ) |  | $ | 26,695 |  |  | $ | (90 | ) |  | $ | 2,504 |  |  | $ | (512 | ) |  | $ | 29,199 |

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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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