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Loans - Age Analysis of Loan Portfolio, Segregated by Class of Loans (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Number of Days Past Due, Total Past Due $ 15,387 $ 15,135
Current 258,560 265,314
Total 273,947 280,449
Loans Past Due Greater Than 90 Days and Still Accruing 0 0
Real Estate, Construction [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Number of Days Past Due, Total Past Due 2,017 1,390
Current 30,080 30,557
Total 32,097 31,947
Loans Past Due Greater Than 90 Days and Still Accruing 0 0
Commercial and Industrial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Number of Days Past Due, Total Past Due 1,941 2,721
Current 20,998 23,639
Total 22,939 26,360
Loans Past Due Greater Than 90 Days and Still Accruing 0 0
Other [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Number of Days Past Due, Total Past Due 78 29
Current 7,528 6,507
Total 7,606 6,536
Loans Past Due Greater Than 90 Days and Still Accruing 0 0
30-59 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Number of Days Past Due, Total Past Due 9,536 6,469
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 1,150 747
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 87 375
30-59 Days Past Due [Member] | Other [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Number of Days Past Due, Total Past Due 76 26
60-89 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Number of Days Past Due, Total Past Due 1,678 916
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 26 121
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 49 2
60-89 Days Past Due [Member] | Other [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Number of Days Past Due, Total Past Due 2 3
Greater than 90 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Number of Days Past Due, Total Past Due 4,173 7,750
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 841 522
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 1,805 2,344
Gaming [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 25,160 26,142
Total 25,160 26,142
Loans Past Due Greater Than 90 Days and Still Accruing 0 0
Residential and Land Development [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Current 239 263
Total 239 263
Loans Past Due Greater Than 90 Days and Still Accruing 0 0
Real Estate, Mortgage [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Number of Days Past Due, Total Past Due 11,351 10,995
Current 174,555 178,206
Total 185,906 189,201
Loans Past Due Greater Than 90 Days and Still Accruing 0 0
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 8,223 5,321
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 1,601 790
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 $ 1,527 $ 4,884