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Investments (Tables) | 12 Months Ended
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Dec. 31, 2016
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:
|  | December 31, 2016
|  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
Available for sale: |  |  |  |  |  |  |  |
Mortgage-backed securities |  | $ | 196,406 |  |  | $ | 929 |  |  | $ | (3,042 | ) |  | $ | 194,293 |
Utah Housing Corporation bonds |  | 15,000 |  |  | — |  |  | (690 | ) |  | 14,310 |
Total |  | $ | 211,406 |  |  | $ | 929 |  |  | $ | (3,732 | ) |  | $ | 208,603 |
|  | December 31, 2015
|  | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Estimated Fair Value
Available for sale: |  |  |  |  |  |  |  |
Mortgage-backed securities |  | $ | 196,402 |  |  | $ | 1,370 |  |  | $ | (2,381 | ) |  | $ | 195,391 |
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 bonds and the estimated fair value 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 December 31, 2016: |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-backed securities |  | $ | (2,423 | ) |  | $ | 129,549 |  |  | $ | (619 | ) |  | $ | 10,885 |  |  | $ | (3,042 | ) |  | $ | 140,434 |
Utah Housing Corporation bonds |  | (690 | ) |  | 14,310 |  |  | — |  |  | — |  |  | (690 | ) |  | 14,310 |
Total |  | $ | (3,113 | ) |  | $ | 143,859 |  |  | $ | (619 | ) |  | $ | 10,885 |  |  | $ | (3,732 | ) |  | $ | 154,744 |
As of December 31, 2015: |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-backed securities |  | $ | (827 | ) |  | $ | 73,802 |  |  | $ | (1,554 | ) |  | $ | 39,271 |  |  | $ | (2,381 | ) |  | $ | 113,073 |
Amortized Cost and Fair Value of Securities by Contractual Maturities | As of December 31, 2016, 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 |  | $ | 278 |  |  | $ | 303 |
2039 |  | 5,405 |  |  | 5,758 |
2042 |  | 15,344 |  |  | 14,621 |
2043 |  | 46,996 |  |  | 47,045 |
2044 |  | 37,970 |  |  | 37,876 |
2045 |  | 50,814 |  |  | 50,084 |
2046 |  | 39,599 |  |  | 38,606 |
2047 |  | 15,000 |  |  | 14,310 |
Total |  | $ | 211,406 |  |  | $ | 208,603 |

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