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Average Annual Recorded Investment and Interest Income Recognized on Impaired Loans Excluding Purchased Credit Impaired Loans (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Financing Receivable, Recorded Investment [Line Items]    
Impaired loans with no related allowance, Average Recorded Investment $ 9,372 $ 12,891
Impaired loans with a related allowance, Average Recorded Investment 11,023 6,799
Total impaired loans, Average Recorded Investment 20,395 19,690
Impaired loans with no related allowance, Interest Income 77 110
Impaired loans with a related allowance, Interest Income 133 103
Total impaired loans, Interest Income 210 213
Commercial Loans | Single-family Non-owner Occupied    
Financing Receivable, Recorded Investment [Line Items]    
Impaired loans with no related allowance, Average Recorded Investment 779 459
Impaired loans with a related allowance, Average Recorded Investment 358 361
Impaired loans with no related allowance, Interest Income 8 9
Impaired loans with a related allowance, Interest Income 7 7
Commercial Loans | Non-farm, Non-residential    
Financing Receivable, Recorded Investment [Line Items]    
Impaired loans with no related allowance, Average Recorded Investment 7,990 8,792
Impaired loans with a related allowance, Average Recorded Investment 5,358 4,064
Impaired loans with no related allowance, Interest Income 69 83
Impaired loans with a related allowance, Interest Income 88 78
Consumer Real Estate | Single Family Owner Occupied    
Financing Receivable, Recorded Investment [Line Items]    
Impaired loans with no related allowance, Average Recorded Investment 603 3,640
Impaired loans with a related allowance, Average Recorded Investment 4,961 2,374
Impaired loans with no related allowance, Interest Income   18
Impaired loans with a related allowance, Interest Income 38 $ 18
Consumer Real Estate | Owner Occupied Construction    
Financing Receivable, Recorded Investment [Line Items]    
Impaired loans with a related allowance, Average Recorded Investment $ 346