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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, 2016
USD ($)
Contract
Jun. 30, 2015
USD ($)
Contract
Jun. 30, 2016
USD ($)
Contract
Jun. 30, 2015
USD ($)
Contract
Financing Receivable, Modifications [Line Items]        
Number of Contracts | Contract 147 137 337 305
Pre-Modification Outstanding Recorded Investment $ 2,653 $ 2,261 $ 6,680 $ 4,989
Post-Modification Outstanding Recorded Investment $ 2,526 $ 2,229 $ 6,413 $ 4,776
Commercial Real Estate [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | Contract     4 2
Pre-Modification Outstanding Recorded Investment     $ 778 $ 312
Post-Modification Outstanding Recorded Investment     $ 749 $ 176
Commercial and Industrial [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | Contract   1   1
Pre-Modification Outstanding Recorded Investment   $ 5   $ 5
Post-Modification Outstanding Recorded Investment   $ 4   $ 4
Total Commercial Loans and Leases [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | Contract   1 4 3
Pre-Modification Outstanding Recorded Investment   $ 5 $ 778 $ 317
Post-Modification Outstanding Recorded Investment   $ 4 $ 749 $ 180
Direct Installment [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | Contract 120 110 265 241
Pre-Modification Outstanding Recorded Investment $ 1,960 $ 1,761 $ 3,984 $ 3,310
Post-Modification Outstanding Recorded Investment $ 1,832 $ 1,729 $ 3,772 $ 3,201
Residential Mortgages [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | Contract 8 7 27 21
Pre-Modification Outstanding Recorded Investment $ 385 $ 231 $ 1,420 $ 812
Post-Modification Outstanding Recorded Investment $ 390 $ 234 $ 1,402 $ 846
Indirect Installment [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | Contract 2 5 5 10
Pre-Modification Outstanding Recorded Investment $ 6 $ 14 $ 17 $ 30
Post-Modification Outstanding Recorded Investment $ 6 $ 13 $ 17 $ 30
Consumer Lines of Credit [Member]        
Financing Receivable, Modifications [Line Items]        
Number of Contracts | Contract 17 14 36 30
Pre-Modification Outstanding Recorded Investment $ 302 $ 250 $ 481 $ 520
Post-Modification Outstanding Recorded Investment $ 298 $ 249 $ 473 $ 519