Note 2: Investments in Debt and Equity Securities: Schedule of Available for Sale Securities by Contractual Maturity (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis	$ 505
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value	520
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis	10,140
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value	10,635
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis	183,925
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	193,256
Available for sale securities not due on a single maturity date amortized cost	585,978
Available for sale securities not due on a single maturity date fair value	600,593
Available for sale equity securities amortized cost	847
Available for sale equity securities fair value	2,006
Available-for-sale Securities, Debt Maturities, Amortized Cost Basis	781,395
Available-for-sale Securities, Debt Maturities, Fair Value	$ 807,010

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