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Allowance for Loan Losses - Summary of Troubled Debt Restructurings (Detail)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
Loan
Sep. 30, 2015
USD ($)
Loan
Sep. 30, 2014
USD ($)
Loan
Construction, Land and Land Development      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of Loans | Loan [1]     2
Pre-Modification Outstanding Recorded Investment [1]     $ 282
Post-Modification Outstanding Recorded Investment [1]     $ 282
Residential Revolving and Junior Mortgages      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Subsequently defaulted number of loans | Loan     1
Subsequently defaulted recorded investment     $ 75
Commercial Mortgages (Owner Occupied)      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of Loans | Loan [2]   1  
Pre-Modification Outstanding Recorded Investment [2]   $ 105  
Post-Modification Outstanding Recorded Investment [2]   $ 124  
Subsequently defaulted number of loans | Loan   1  
Subsequently defaulted recorded investment   $ 124  
Residential First Mortgages      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Number of Loans | Loan [1] 1 1  
Pre-Modification Outstanding Recorded Investment [1] $ 213 $ 213  
Post-Modification Outstanding Recorded Investment [1] $ 211 $ 211  
[1] Modifications were an extension of loan terms.
[2] Modifications were capitalization of interest.