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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 ($)
Contract
Sep. 30, 2014
USD ($)
Contract
Sep. 30, 2015
USD ($)
Contract
Sep. 30, 2014
USD ($)
Contract
Financing Receivable, Modifications [Line Items]        
Total Contracts 1 2 2 2
Pre-Modification Recorded Investment | $ $ 78 $ 312 $ 431 $ 312
Commercial Loans | Single-family Non-owner Occupied        
Financing Receivable, Modifications [Line Items]        
Total Contracts 1   1  
Pre-Modification Recorded Investment | $ $ 78   $ 78  
Consumer Real Estate | Single Family Owner Occupied        
Financing Receivable, Modifications [Line Items]        
Total Contracts   2   2
Pre-Modification Recorded Investment | $   $ 312   $ 312
Consumer Real Estate | Owner Occupied Construction        
Financing Receivable, Modifications [Line Items]        
Total Contracts     1  
Pre-Modification Recorded Investment | $     $ 353