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Interest Income Related to Troubled Debt Restructurings (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Financing Receivable, Impaired [Line Items]        
Interest income recognized $ 148 $ 188 $ 456 $ 466