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Note 12: Business Combinations: Business Combinations Policy (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Jun. 30, 2018
Business Acquisition, Name of Acquired Entity     Gideon Bancshares Company (“Gideon”), and its wholly owned subsidiary, First Commercial Bank (“First Commercial”)    
Noninterest Expense $ 12,552 $ 10,519 $ 24,000 $ 21,273  
Noninterest Expense 12,552 $ 10,519 24,000 $ 21,273  
Gideon Bancshares Company          
Business Combination, Acquisition Related Costs 629        
Noninterest Expense 420   554   $ 75
Noninterest Expense $ 420   $ 554   $ 75