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Loans - Evaluation of Quality of Loan Portfolio (Detail) - Credit Concentration Risk [Member] - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Gaming [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total outstanding concentrations $ 31,655 $ 31,353 $ 29,570
Hotel/Motel [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total outstanding concentrations 39,460 47,144 49,842
Out of Area [Member]      
Financing Receivable, Recorded Investment [Line Items]      
Total outstanding concentrations $ 14,526 $ 19,179 $ 24,945