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Average Recorded Investment and Interest Income Recognized on Impaired Loans Excluding Purchased Credit Impaired Loans (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]      
Construction, development, and other land $ 986 $ 835 $ 902
Impaired loans with a related allowance, Interest Income Recognized 370 117 152
Total impaired loans, Interest Income Recognized 1,356 952 1,054
Impaired loans with no related allowance, Average Recorded Investment 27,494 29,064 25,128
Impaired loans with a related allowance, Average Recorded Investment 8,996 9,471 14,098
Total impaired loans, Average Recorded Investment 36,490 38,535 39,226
Commercial Loans | Commercial and Industrial      
Financing Receivable, Recorded Investment [Line Items]      
Construction, development, and other land 16   18
Impaired loans with a related allowance, Interest Income Recognized     47
Impaired loans with no related allowance, Average Recorded Investment 646 324 1,627
Impaired loans with a related allowance, Average Recorded Investment     2,199
Commercial Loans | Multi-family Residential      
Financing Receivable, Recorded Investment [Line Items]      
Construction, development, and other land 21 4 21
Impaired loans with a related allowance, Interest Income Recognized     23
Impaired loans with no related allowance, Average Recorded Investment 308 269 162
Impaired loans with a related allowance, Average Recorded Investment     4,190
Commercial Loans | Single-family Non-owner Occupied      
Financing Receivable, Recorded Investment [Line Items]      
Construction, development, and other land 178 88 60
Impaired loans with a related allowance, Interest Income Recognized 23 25 2
Impaired loans with no related allowance, Average Recorded Investment 3,076 2,140 1,629
Impaired loans with a related allowance, Average Recorded Investment 518 575 369
Commercial Loans | Non-farm, Non-residential      
Financing Receivable, Recorded Investment [Line Items]      
Construction, development, and other land 307 312 353
Impaired loans with a related allowance, Interest Income Recognized 215 65 31
Impaired loans with no related allowance, Average Recorded Investment 8,573 11,677 8,248
Impaired loans with a related allowance, Average Recorded Investment 3,831 4,987 3,386
Commercial Loans | Farmland Loan      
Financing Receivable, Recorded Investment [Line Items]      
Construction, development, and other land 55 16 6
Impaired loans with a related allowance, Interest Income Recognized 14    
Impaired loans with no related allowance, Average Recorded Investment 437 195 315
Impaired loans with a related allowance, Average Recorded Investment 108    
Commercial Loans | Construction Development And Other Land      
Financing Receivable, Recorded Investment [Line Items]      
Construction, development, and other land 22 5 8
Impaired loans with no related allowance, Average Recorded Investment 344 481 607
Commercial Loans | Agricultural      
Financing Receivable, Recorded Investment [Line Items]      
Impaired loans with no related allowance, Average Recorded Investment     1
Consumer Real Estate | Home Equity Lines      
Financing Receivable, Recorded Investment [Line Items]      
Construction, development, and other land 30 36 22
Impaired loans with a related allowance, Interest Income Recognized     1
Impaired loans with no related allowance, Average Recorded Investment 1,223 813 686
Impaired loans with a related allowance, Average Recorded Investment     57
Consumer Real Estate | Single Family Owner Occupied      
Financing Receivable, Recorded Investment [Line Items]      
Construction, development, and other land 343 356 404
Impaired loans with a related allowance, Interest Income Recognized 118 26 48
Impaired loans with no related allowance, Average Recorded Investment 12,330 12,708 11,486
Impaired loans with a related allowance, Average Recorded Investment 4,452 3,731 3,897
Consumer Real Estate | Owner Occupied Construction      
Financing Receivable, Recorded Investment [Line Items]      
Construction, development, and other land 9 10 5
Impaired loans with a related allowance, Interest Income Recognized   1  
Impaired loans with no related allowance, Average Recorded Investment 497 359 259
Impaired loans with a related allowance, Average Recorded Investment 87 178  
Consumer and Other Loans | Consumer Loan      
Financing Receivable, Recorded Investment [Line Items]      
Construction, development, and other land 5 8 5
Impaired loans with no related allowance, Average Recorded Investment $ 60 $ 98 $ 108