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Allowance for Loan Losses and Recorded Investment in Loans, Evaluated for Impairment Excluding PCI Loans, by Loan Class (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Financing Receivable, Recorded Investment [Line Items]    
Loans Individually Evaluated for Impairment $ 21,509 $ 16,048
Allowance for Loans Individually Evaluated 2,241 1,482
Loans Collectively Evaluated for Impairment 1,590,715 1,611,085
Allowance for Loans Collectively Evaluated 17,902 18,687
Commercial Loans    
Financing Receivable, Recorded Investment [Line Items]    
Loans Individually Evaluated for Impairment 15,376 10,310
Allowance for Loans Individually Evaluated 1,698 1,045
Loans Collectively Evaluated for Impairment 853,093 878,292
Allowance for Loans Collectively Evaluated 11,296 11,965
Commercial Loans | Construction Development And Other Land    
Financing Receivable, Recorded Investment [Line Items]    
Loans Collectively Evaluated for Impairment 46,459 51,608
Allowance for Loans Collectively Evaluated 957 1,151
Commercial Loans | Commercial and Industrial    
Financing Receivable, Recorded Investment [Line Items]    
Loans Collectively Evaluated for Impairment 83,086 85,353
Allowance for Loans Collectively Evaluated 495 690
Commercial Loans | Multi-family Residential    
Financing Receivable, Recorded Investment [Line Items]    
Loans Collectively Evaluated for Impairment 96,735 98,880
Allowance for Loans Collectively Evaluated 1,621 1,917
Commercial Loans | Single-family Non-owner Occupied    
Financing Receivable, Recorded Investment [Line Items]    
Loans Individually Evaluated for Impairment 1,149 833
Allowance for Loans Individually Evaluated 41 45
Loans Collectively Evaluated for Impairment 143,023 135,223
Allowance for Loans Collectively Evaluated 3,253 3,183
Commercial Loans | Non-farm, Non-residential    
Financing Receivable, Recorded Investment [Line Items]    
Loans Individually Evaluated for Impairment 14,227 9,477
Allowance for Loans Individually Evaluated 1,657 1,000
Loans Collectively Evaluated for Impairment 453,276 475,353
Allowance for Loans Collectively Evaluated 4,774 4,805
Commercial Loans | Agricultural    
Financing Receivable, Recorded Investment [Line Items]    
Loans Collectively Evaluated for Impairment 1,898 1,642
Allowance for Loans Collectively Evaluated 14 13
Commercial Loans | Farmland Loan    
Financing Receivable, Recorded Investment [Line Items]    
Loans Collectively Evaluated for Impairment 28,616 30,233
Allowance for Loans Collectively Evaluated 182 206
Consumer Real Estate    
Financing Receivable, Recorded Investment [Line Items]    
Loans Individually Evaluated for Impairment 6,133 5,738
Allowance for Loans Individually Evaluated 543 437
Loans Collectively Evaluated for Impairment 657,972 656,809
Allowance for Loans Collectively Evaluated 5,925 6,052
Consumer Real Estate | Home Equity Lines    
Financing Receivable, Recorded Investment [Line Items]    
Loans Collectively Evaluated for Impairment 128,823 134,006
Allowance for Loans Collectively Evaluated 1,288 1,330
Consumer Real Estate | Single Family Owner Occupied    
Financing Receivable, Recorded Investment [Line Items]    
Loans Individually Evaluated for Impairment 5,777 5,738
Allowance for Loans Individually Evaluated 543 437
Loans Collectively Evaluated for Impairment 491,897 489,820
Allowance for Loans Collectively Evaluated 4,390 4,498
Consumer Real Estate | Owner Occupied Construction    
Financing Receivable, Recorded Investment [Line Items]    
Loans Individually Evaluated for Impairment 356  
Loans Collectively Evaluated for Impairment 37,252 32,983
Allowance for Loans Collectively Evaluated 247 224
Consumer and Other    
Financing Receivable, Recorded Investment [Line Items]    
Loans Collectively Evaluated for Impairment 79,650 75,984
Allowance for Loans Collectively Evaluated 681 670
Consumer and Other | Consumer Loan    
Financing Receivable, Recorded Investment [Line Items]    
Loans Collectively Evaluated for Impairment 72,178 69,429
Allowance for Loans Collectively Evaluated 681 670
Consumer and Other | Other    
Financing Receivable, Recorded Investment [Line Items]    
Loans Collectively Evaluated for Impairment $ 7,472 $ 6,555