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Note 5: Investment Securities: Schedule of Available-for-sale Securities Reconciliation (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Available-for-sale Securities, Amortized Cost Basis $ 191,875  
Available for Sale Securities Fair Value 195,144  
Available-for-sale Securities    
Available-for-sale Securities, Amortized Cost Basis 191,875 $ 211,173
Available for sale Securities, Gross Unrealized Gain 4,258 4,208
Available For Sale Securities Gross Unrealized Losses 989 1,509
Available for Sale Securities Fair Value $ 195,144 $ 213,872
Available for Sale Securities Tax Equivalent Yield 3.21% 3.16%
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises    
Available-for-sale Securities, Amortized Cost Basis $ 133,569 $ 146,491
Available for sale Securities, Gross Unrealized Gain 978 1,045
Available For Sale Securities Gross Unrealized Losses 989 1,501
Available for Sale Securities Fair Value $ 133,558 $ 146,035
Available for Sale Securities Tax Equivalent Yield 2.11% 2.03%
US States and Political Subdivisions Debt Securities    
Available-for-sale Securities, Amortized Cost Basis $ 58,306 $ 64,682
Available for sale Securities, Gross Unrealized Gain 3,280 3,163
Available For Sale Securities Gross Unrealized Losses   8
Available for Sale Securities Fair Value $ 61,586 $ 67,837
Available for Sale Securities Tax Equivalent Yield 5.74% 5.73%