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Loans - Analysis of Loan Portfolio by Loan Grade, Segregated by Class of Loans (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Loan Portfolio By Loan Grade [Line Items]    
Gaming $ 50,337 $ 60,187
Residential and land development 27,083 27,338
Real estate, construction 49,947 52,586
Real estate, mortgage 233,158 246,420
Commercial and industrial 34,339 35,004
Other 8,234 9,548
Total 403,098 431,083
A or B [Member]
   
Loan Portfolio By Loan Grade [Line Items]    
Gaming 26,258 27,530
Residential and land development 4,505 4,630
Real estate, construction 40,999 43,318
Real estate, mortgage 198,510 209,479
Commercial and industrial 31,391 32,036
Other 8,117 9,449
Total 309,780 326,442
C [Member]
   
Loan Portfolio By Loan Grade [Line Items]    
Gaming 2,500 12,300
Residential and land development 1,607 1,544
Real estate, construction 1,151 1,001
Real estate, mortgage 4,146 3,093
Commercial and industrial 628 442
Other 44 27
Total 10,076 18,407
D [Member]
   
Loan Portfolio By Loan Grade [Line Items]    
Gaming 7,535 4,108
Residential and land development   81
Real estate, construction 2,684 2,701
Real estate, mortgage 17,356 21,167
Commercial and industrial 2,287 2,312
Other 69 72
Total 29,931 30,441
E [Member]
   
Loan Portfolio By Loan Grade [Line Items]    
Gaming 14,044 16,249
Residential and land development 20,971 21,083
Real estate, construction 5,113 5,566
Real estate, mortgage 13,146 12,681
Commercial and industrial 33 214
Other 4   
Total 53,311 55,793
F [Member]
   
Loan Portfolio By Loan Grade [Line Items]    
Gaming      
Residential and land development      
Real estate, construction      
Real estate, mortgage      
Commercial and industrial      
Other      
Total