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Investments - Gross Unrealized Losses and Fair Value for Mortgage-Backed in Unrealized Loss Position (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Less than 12 months, Gross Unrealized Losses | $ (3,113) |
12 months or more, Gross Unrealized Losses | (619) |
Total, Gross Unrealized Losses | (3,732) |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Less than 12 months, Estimated Fair Value | 143,859 |
12 months or more, Estimated Fair Value | 10,885 |
Total, Estimated Fair Value | 154,744 |
Mortgage-backed securities |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Less than 12 months, Gross Unrealized Losses | (2,423) | $ (827)
12 months or more, Gross Unrealized Losses | (619) | (1,554)
Total, Gross Unrealized Losses | (3,042) | (2,381)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Less than 12 months, Estimated Fair Value | 129,549 | 73,802
12 months or more, Estimated Fair Value | 10,885 | 39,271
Total, Estimated Fair Value | 140,434 | $ 113,073
Utah Housing Corporation bonds |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract] |  |
Less than 12 months, Gross Unrealized Losses | (690) |
12 months or more, Gross Unrealized Losses | 0 |
Total, Gross Unrealized Losses | (690) |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] |  |
Less than 12 months, Estimated Fair Value | 14,310 |
12 months or more, Estimated Fair Value | 0 |
Total, Estimated Fair Value | $ 14,310 |

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27337-111563 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale in a continuous loss position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563 + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27337-111563 + Details
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