Quarterly report pursuant to Section 13 or 15(d)

Loans and Leases - Troubled Debt Restructurings that Defaulted Subsequent to Modifications Occurring Within Previous Twelve Months, Disaggregated by Loan Class (Detail)

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Loans and Leases - Troubled Debt Restructurings that Defaulted Subsequent to Modifications Occurring Within Previous Twelve Months, Disaggregated by Loan Class (Detail)
$ in Thousands
3 Months Ended
Mar. 31, 2017
USD ($)
SecurityLoan
Mar. 31, 2016
USD ($)
SecurityLoan
Financing Receivable, Modifications [Line Items]    
Number of Loans | SecurityLoan 0 3
Recorded Investment | $ $ 0 $ 749
Real estate loans [Member] | Other [Member]    
Financing Receivable, Modifications [Line Items]    
Number of Loans | SecurityLoan 0 2
Recorded Investment | $ $ 0 $ 719
Commercial and industrial loans [Member] | Commercial term [Member]    
Financing Receivable, Modifications [Line Items]    
Number of Loans | SecurityLoan 0 1
Recorded Investment | $ $ 0 $ 30