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Loans and Allowance for Probable Loan Losses - Allowance Balance, by Impairment Method (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Schedule of Allowance For Loan Losses, Allowance Balance, by Impairment Method [Line Items]            
Ending balance - individually evaluated for impairment [1] $ 294   $ 1,086      
Ending balance - collectively evaluated for impairment 18,947   16,825      
Balance at end of period 19,241 $ 18,485 17,911 $ 14,908 $ 21,799 $ 19,736
Construction Real Estate Loans            
Schedule of Allowance For Loan Losses, Allowance Balance, by Impairment Method [Line Items]            
Ending balance - individually evaluated for impairment [1] 5   13      
Ending balance - collectively evaluated for impairment 3,568   4,134      
Balance at end of period 3,573 3,407 4,147 4,423 4,577 4,350
1-4 Family Residential Real Estate Loans            
Schedule of Allowance For Loan Losses, Allowance Balance, by Impairment Method [Line Items]            
Ending balance - individually evaluated for impairment [1] 13   16      
Ending balance - collectively evaluated for impairment 2,379   2,649      
Balance at end of period 2,392 2,317 2,665 1,686 2,155 2,595
Commercial Real Estate Loans            
Schedule of Allowance For Loan Losses, Allowance Balance, by Impairment Method [Line Items]            
Ending balance - individually evaluated for impairment [1] 15   17      
Ending balance - collectively evaluated for impairment 9,955   7,187      
Balance at end of period 9,970 8,787 7,204 4,680 4,467 4,577
Commercial Loans            
Schedule of Allowance For Loan Losses, Allowance Balance, by Impairment Method [Line Items]            
Ending balance - individually evaluated for impairment [1] 154   923      
Ending balance - collectively evaluated for impairment 1,470   1,340      
Balance at end of period 1,624 2,259 2,263 2,474 8,964 6,596
Municipal Loans            
Schedule of Allowance For Loan Losses, Allowance Balance, by Impairment Method [Line Items]            
Ending balance - individually evaluated for impairment [1] 11   11      
Ending balance - collectively evaluated for impairment 754   739      
Balance at end of period 765 746 750 737 720 725
Loans to Individuals            
Schedule of Allowance For Loan Losses, Allowance Balance, by Impairment Method [Line Items]            
Ending balance - individually evaluated for impairment [1] 96   106      
Ending balance - collectively evaluated for impairment 821   776      
Balance at end of period 917 $ 969 882 $ 908 $ 916 $ 893
OmniAmerican Bancorp, Inc.            
Schedule of Allowance For Loan Losses, Allowance Balance, by Impairment Method [Line Items]            
Allowance for credit losses, individually evaluated for impairment, PCI loans $ 3   $ 3      
[1] There was approximately $3,000 of allowance for loan losses associated with PCI loans as of June 30, 2017 and December 31, 2016.