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Loans and Leases - Summary of Troubled Debt Restructurings by Class of Loans (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 137 183 305 334
Pre-Modification Outstanding Recorded Investment $ 2,261 $ 6,024 $ 4,989 $ 8,547
Post-Modification Outstanding Recorded Investment $ 2,229 $ 5,953 $ 4,776 $ 8,383
Commercial Real Estate [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | Contract   8 2 9
Pre-Modification Outstanding Recorded Investment   $ 2,508 $ 312 $ 2,581
Post-Modification Outstanding Recorded Investment   $ 2,496 $ 176 $ 2,553
Commercial and Industrial [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | Contract 1   1 1
Pre-Modification Outstanding Recorded Investment $ 5   $ 5 $ 188
Post-Modification Outstanding Recorded Investment $ 4   $ 4 $ 188
Total Commercial Loans and Leases [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | Contract 1 8 3 10
Pre-Modification Outstanding Recorded Investment $ 5 $ 2,508 $ 317 $ 2,769
Post-Modification Outstanding Recorded Investment $ 4 $ 2,496 $ 180 $ 2,741
Direct Installment [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | Contract 110 136 241 262
Pre-Modification Outstanding Recorded Investment $ 1,761 $ 1,873 $ 3,310 $ 3,573
Post-Modification Outstanding Recorded Investment $ 1,729 $ 1,843 $ 3,201 $ 3,479
Residential Mortgages [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | Contract 7 15 21 24
Pre-Modification Outstanding Recorded Investment $ 231 $ 1,070 $ 812 $ 1,359
Post-Modification Outstanding Recorded Investment $ 234 $ 1,045 $ 846 $ 1,324
Indirect Installment [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | Contract 5 6 10 13
Pre-Modification Outstanding Recorded Investment $ 14 $ 18 $ 30 $ 34
Post-Modification Outstanding Recorded Investment $ 13 $ 16 $ 30 $ 32
Consumer Lines of Credit [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | Contract 14 18 30 25
Pre-Modification Outstanding Recorded Investment $ 250 $ 555 $ 520 $ 812
Post-Modification Outstanding Recorded Investment $ 249 $ 553 $ 519 $ 807