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Loans and Leases - Summary of Troubled Debt Restructurings by Class of Loans and Leases, Payment Default (Detail)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
Contract
Jun. 30, 2014
USD ($)
Contract
Jun. 30, 2015
USD ($)
Contract
Jun. 30, 2014
USD ($)
Contract
Financing Receivable, Modifications [Line Items]        
Number of Contracts | Contract 34 34 69 48
Recorded Investment [1] $ 446 $ 240 $ 681 $ 392
Commercial and Industrial [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | Contract 1   1  
Recorded Investment [1] $ 229   $ 229  
Total Commercial Loans and Leases [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | Contract 1   1  
Recorded Investment [1] $ 229   $ 229  
Direct Installment [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | Contract 27 33 58 47
Recorded Investment [1] $ 96 $ 240 $ 182 $ 392
Residential Mortgages [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | Contract 3   4  
Recorded Investment [1] $ 114   $ 171  
Indirect Installment [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | Contract 3 1 5 1
Recorded Investment [1] $ 7   $ 7  
Consumer Lines of Credit [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | Contract     1  
Recorded Investment [1]     $ 92  
[1] The recorded investment is as of period end.