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Loans and Allowance for Loan and Lease Losses - Loan Balances and Related ALLL (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance for loans individually evaluated for impairment $ 405   $ 1,532      
Allowance for loans collectively evaluated for impairment 11,938   12,301      
Total allowance 12,343 $ 12,639 13,833 $ 12,580 $ 11,940 $ 11,358
Loans individually evaluated for impairment 31,646   35,137      
Loans collectively evaluated for impairment 801,655   802,834      
Total loans balance 833,301   837,971      
Commercial loans [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance for loans individually evaluated for impairment 405   995      
Allowance for loans collectively evaluated for impairment 6,076   6,675      
Total allowance 6,481 7,353 7,670 6,477 5,988 5,812
Loans individually evaluated for impairment 14,333   21,117      
Loans collectively evaluated for impairment 308,908   280,629      
Total loans balance 323,241   301,746      
Real Estate [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance for loans individually evaluated for impairment 0   537      
Allowance for loans collectively evaluated for impairment 4,889   4,596      
Total allowance 4,889 4,287 5,133 5,397 5,039 4,517
Loans individually evaluated for impairment 11,573   7,536      
Loans collectively evaluated for impairment 412,814   446,931      
Total loans balance 424,387   454,467      
Land Development [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance for loans individually evaluated for impairment 0   0      
Allowance for loans collectively evaluated for impairment 44   296      
Total allowance 44 120 296 85 154 165
Loans individually evaluated for impairment 1,685   2,111      
Loans collectively evaluated for impairment 3,890   5,634      
Total loans balance 5,575   7,745      
Consumer and Single Family Mortgages [Member]            
Financing Receivable, Allowance for Credit Losses [Line Items]            
Allowance for loans individually evaluated for impairment 0   0      
Allowance for loans collectively evaluated for impairment 929   734      
Total allowance 929 $ 879 734 $ 621 $ 759 $ 864
Loans individually evaluated for impairment 4,055   4,373      
Loans collectively evaluated for impairment 76,043   69,640      
Total loans balance $ 80,098   $ 74,013