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Allowance for Loan Losses - Summary of Troubled Debt Restructurings (Detail) - Commercial and Industrial
$ in Thousands
3 Months Ended
Mar. 31, 2015
USD ($)
Loan
Sep. 30, 2014
USD ($)
Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Number of Loans | Loan [1] 1  
Pre-Modification Outstanding Recorded Investment [1] $ 124  
Post-Modification Outstanding Recorded Investment [1] $ 124  
Subsequently defaulted number of loans | Loan   1
Subsequently defaulted recorded investment   $ 124
[1] Modifications were an extension of loan terms.