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Loans Modified as Troubled Debt Restructurings by Loan Class for which there was Payment Default (Detail)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
Contract
Sep. 30, 2015
USD ($)
Contract
Financing Receivable, Modifications [Line Items]    
Total Contracts | Contract 1 2
Post-Modification Recorded Investment | $ $ 78 $ 431
Commercial Loans | Single-family Non-owner Occupied    
Financing Receivable, Modifications [Line Items]    
Total Contracts | Contract 1 1
Post-Modification Recorded Investment | $ $ 78 $ 78
Consumer Real Estate | Owner Occupied Construction    
Financing Receivable, Modifications [Line Items]    
Total Contracts | Contract   1
Post-Modification Recorded Investment | $   $ 353