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Loans - Age Analysis of Loan Portfolio, Segregated by Class of Loans (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Number of Days Past Due, Total Past Due $ 16,628 $ 28,865 $ 43,073
Current 320,929 333,542 332,276
Total 337,557 362,407 375,349
Loans Past Due Greater Than 90 Days and Still Accruing 146 763 651
Real Estate, Construction [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Number of Days Past Due, Total Past Due 2,645 3,694 13,298
Current 32,769 30,316 31,689
Total 35,414 34,010 44,987
Loans Past Due Greater Than 90 Days and Still Accruing   30 146
Commercial and Industrial [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Number of Days Past Due, Total Past Due 1,474 1,366 1,192
Current 41,006 36,168 33,815
Total 42,480 37,534 35,007
Other [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Number of Days Past Due, Total Past Due 67 178 232
Current 7,083 14,500 8,992
Total 7,150 14,678 9,224
30-59 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Number of Days Past Due, Total Past Due 9,218 6,244 12,226
30-59 Days Past Due [Member] | Real Estate, Construction [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Number of Days Past Due, Total Past Due 851 1,665 3,846
30-59 Days Past Due [Member] | Commercial and Industrial [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Number of Days Past Due, Total Past Due 1,206 1,154 1,192
30-59 Days Past Due [Member] | Other [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Number of Days Past Due, Total Past Due 67 168 227
60-89 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Number of Days Past Due, Total Past Due 4,152 3,203 2,689
60-89 Days Past Due [Member] | Real Estate, Construction [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Number of Days Past Due, Total Past Due 448 85  
60-89 Days Past Due [Member] | Commercial and Industrial [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Number of Days Past Due, Total Past Due 31 7  
60-89 Days Past Due [Member] | Other [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Number of Days Past Due, Total Past Due   10 5
Greater than 90 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Number of Days Past Due, Total Past Due 3,258 19,418 28,158
Greater than 90 Days Past Due [Member] | Real Estate, Construction [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Number of Days Past Due, Total Past Due 1,346 1,944 9,452
Greater than 90 Days Past Due [Member] | Commercial and Industrial [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Number of Days Past Due, Total Past Due 237 205  
Gaming [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Current 31,655 31,353 29,570
Total 31,655 31,353 29,570
Residential and Land Development [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Number of Days Past Due, Total Past Due 323 5,262 13,623
Current 610 4,857 5,780
Total 933 10,119 19,403
Residential and Land Development [Member] | 30-59 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Number of Days Past Due, Total Past Due     51
Residential and Land Development [Member] | Greater than 90 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Number of Days Past Due, Total Past Due 323 5,262 13,572
Real Estate, Mortgage [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Number of Days Past Due, Total Past Due 12,119 18,365 14,728
Current 207,806 216,348 222,430
Total 219,925 234,713 237,158
Loans Past Due Greater Than 90 Days and Still Accruing 146 733 505
Real Estate, Mortgage [Member] | 30-59 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Number of Days Past Due, Total Past Due 7,094 3,257 6,910
Real Estate, Mortgage [Member] | 60-89 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Number of Days Past Due, Total Past Due 3,673 3,101 2,684
Real Estate, Mortgage [Member] | Greater than 90 Days Past Due [Member]      
Financing Receivable, Recorded Investment, Past Due [Line Items]      
Number of Days Past Due, Total Past Due $ 1,352 $ 12,007 $ 5,134