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Investments (Tables) | 9 Months Ended
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Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract] |
Schedule of amortized cost and fair value of securities available for sale | The amortized cost and fair value of securities available for sale are as follows:
|  | September 30, 2018
|  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
Available for sale: |  |  |  |  |  |  |  |
Mortgage-backed securities |  | $ | 159,397 |  |  | $ | 92 |  |  | $ | (8,046 | ) |  | $ | 151,443 |
Utah Housing Corporation bonds |  | 22,388 |  |  | — |  |  | (1,461 | ) |  | 20,927 |
Total |  | $ | 181,785 |  |  | $ | 92 |  |  | $ | (9,507 | ) |  | $ | 172,370 |
|  | December 31, 2017
|  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
Available for sale: |  |  |  |  |  |  |  |
Mortgage-backed securities |  | $ | 227,607 |  |  | $ | 650 |  |  | $ | (3,210 | ) |  | $ | 225,047 |
Utah Housing Corporation bonds |  | 20,000 |  |  | — |  |  | (959 | ) |  | 19,041 |
Total |  | $ | 247,607 |  |  | $ | 650 |  |  | $ | (4,169 | ) |  | $ | 244,088 |
Available-for-sale securities, continuous unrealized loss position, fair value | The following table summarizes the amount of gross unrealized losses for our mortgage-backed securities and Utah Housing Corporation bonds and the estimated fair value for securities having gross unrealized losses, categorized by length of time the securities have been in an unrealized loss position:
|  | Less than 12 months |  | 12 months or more |  | Total
|  | Gross Unrealized Losses |  | Estimated Fair Value |  | Gross Unrealized Losses |  | Estimated Fair Value |  | Gross Unrealized Losses |  | Estimated Fair Value
As of September 30, 2018: |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-backed securities |  | $ | (1,768 | ) |  | $ | 43,253 |  |  | $ | (6,278 | ) |  | $ | 104,841 |  |  | $ | (8,046 | ) |  | $ | 148,094 |
Utah Housing Corporation bonds |  | (125 | ) |  | 4,875 |  |  | (1,336 | ) |  | 16,052 |  |  | (1,461 | ) |  | 20,927 |
Total |  | $ | (1,893 | ) |  | $ | 48,128 |  |  | $ | (7,614 | ) |  | $ | 120,893 |  |  | $ | (9,507 | ) |  | $ | 169,021 |
As of December 31, 2017: |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-backed securities |  | $ | (772 | ) |  | $ | 77,356 |  |  | $ | (2,438 | ) |  | $ | 110,500 |  |  | $ | (3,210 | ) |  | $ | 187,856 |
Utah Housing Corporation bonds |  | (77 | ) |  | 4,923 |  |  | (882 | ) |  | 14,118 |  |  | (959 | ) |  | 19,041 |
Total |  | $ | (849 | ) |  | $ | 82,279 |  |  | $ | (3,320 | ) |  | $ | 124,618 |  |  | $ | (4,169 | ) |  | $ | 206,897 |
Schedule of amortized cost and fair value of securities, by contractual maturities | As of September 30, 2018, the amortized cost and fair value of securities, by contractual maturities, are summarized below. Contractual maturities versus actual maturities may differ due to the effect of prepayments.
Year of Maturity |  | Amortized Cost |  | Estimated Fair Value
2038 |  | $ | 267 |  |  | $ | 281 |
2039 |  | 2,990 |  |  | 3,068 |
2042 |  | 9,524 |  |  | 8,766 |
2043 |  | 14,396 |  |  | 13,728 |
2044 |  | 23,437 |  |  | 22,535 |
2045 |  | 25,868 |  |  | 24,468 |
2046 |  | 40,006 |  |  | 37,703 |
2047 |  | 57,395 |  |  | 54,082 |
2048 |  | 7,902 |  |  | 7,739 |
Total |  | $ | 181,785 |  |  | $ | 172,370 |

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- Definition Tabular disclosure of fair value amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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