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Note 2: Investments in Securities: Unrealized Gain (Loss) on Investments (Details) - USD ($)
$ in Thousands
 12 Months Ended
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)