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Note 2: Investments in Securities: Unrealized Gain (Loss) on Investments (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Total Unrealized Losses and Estimated Fair Value |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | $ 33,862 | $ 104,460
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | (384) | (1,509)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 55,845 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss | (1,254) | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 89,707 | 104,460
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss | (1,638) | (1,509)
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 33,862 | 102,296
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | (384) | (1,501)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 55,845 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss | (1,254) | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 89,707 | 102,296
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss | (1,638) | (1,501)
US States and Political Subdivisions Debt Securities |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | 0 | 2,164
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | 0 | (8)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 0 | 2,164
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss | $ 0 | $ (8)

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- Definition Amount of unrealized loss on securities classified as available-for-sale that have been in a 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=82897076&loc=d3e27290-111563 + Details
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- Definition Amount of unrealized loss on securities classified as available-for-sale. + 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=82897076&loc=d3e27290-111563 + Details
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