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Allowance for Loan Losses, Allowance for Losses on Lending-Related Commitments and Impaired Loans Allowance for Loan Losses, Allowance for Losses on Lending-Related Commitments and Impaired Loans (Summary of the Post-Modification Balance of TDRs) (Detail)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
USD ($)
contracts
Sep. 30, 2014
USD ($)
contracts
Sep. 30, 2015
USD ($)
contracts
Sep. 30, 2014
USD ($)
contracts
Sep. 30, 2015
USD ($)
contracts
 [3],[4]
Sep. 30, 2014
USD ($)
contracts
 [3],[4]
Financing Receivable, Modifications [Line Items]            
TDRs, number 1 [1],[2] 3 [1],[2] 10 [1],[2] 16 [1],[2] 15 21
TDRs, Additions | $ $ 222 [1],[2] $ 667 [1],[2] $ 1,833 [1],[2] $ 8,152 [1],[2] $ 5,648 $ 10,086
Extension at Below Market Terms            
Financing Receivable, Modifications [Line Items]            
TDRs, number [1] 1 2 10 10    
TDRs, Additions | $ [1] $ 222 $ 456 $ 1,833 $ 5,671    
Reduction of Interest Rate            
Financing Receivable, Modifications [Line Items]            
TDRs, number [1] 1 3 5 11    
TDRs, Additions | $ [1] $ 222 $ 667 $ 674 $ 5,774    
Modification to Interest Only Payments            
Financing Receivable, Modifications [Line Items]            
TDRs, number [1] 0 0 2 4    
TDRs, Additions | $ [1] $ 0 $ 0 $ 219 $ 2,659    
Forgiveness of Debt            
Financing Receivable, Modifications [Line Items]            
TDRs, number [1] 0 0 0 0    
TDRs, Additions | $ [1] $ 0 $ 0 $ 0 $ 0    
Residential real estate and other            
Financing Receivable, Modifications [Line Items]            
TDRs, number 1 [1],[2] 3 [1],[2] 9 [1],[2] 4 [1],[2] 11 6
TDRs, Additions | $ $ 222 [1],[2] $ 667 [1],[2] $ 1,664 [1],[2] $ 887 [1],[2] $ 2,613 $ 1,406
Residential real estate and other | Extension at Below Market Terms            
Financing Receivable, Modifications [Line Items]            
TDRs, number [1] 1 2 9 3    
TDRs, Additions | $ [1] $ 222 $ 456 $ 1,664 $ 676    
Residential real estate and other | Reduction of Interest Rate            
Financing Receivable, Modifications [Line Items]            
TDRs, number [1] 1 3 5 3    
TDRs, Additions | $ [1] $ 222 $ 667 $ 674 $ 667    
Residential real estate and other | Modification to Interest Only Payments            
Financing Receivable, Modifications [Line Items]            
TDRs, number [1] 0 0 1 1    
TDRs, Additions | $ [1] $ 0 $ 0 $ 50 $ 220    
Residential real estate and other | Forgiveness of Debt            
Financing Receivable, Modifications [Line Items]            
TDRs, number [1] 0 0 0 0    
TDRs, Additions | $ [1] $ 0 $ 0 $ 0 $ 0    
Commercial and industrial | Commercial            
Financing Receivable, Modifications [Line Items]            
TDRs, number 0 [1],[2] 0 [1],[2] 0 [1],[2] 1 [1],[2] 1 1
TDRs, Additions | $ $ 0 [1],[2] $ 0 [1],[2] $ 0 [1],[2] $ 88 [1],[2] $ 1,461 $ 88
Commercial and industrial | Commercial | Extension at Below Market Terms            
Financing Receivable, Modifications [Line Items]            
TDRs, number [1] 0 0 0 1    
TDRs, Additions | $ [1] $ 0 $ 0 $ 0 $ 88    
Commercial and industrial | Commercial | Reduction of Interest Rate            
Financing Receivable, Modifications [Line Items]            
TDRs, number [1] 0 0 0 0    
TDRs, Additions | $ [1] $ 0 $ 0 $ 0 $ 0    
Commercial and industrial | Commercial | Modification to Interest Only Payments            
Financing Receivable, Modifications [Line Items]            
TDRs, number [1] 0 0 0 1    
TDRs, Additions | $ [1] $ 0 $ 0 $ 0 $ 88    
Commercial and industrial | Commercial | Forgiveness of Debt            
Financing Receivable, Modifications [Line Items]            
TDRs, number [1] 0 0 0 0    
TDRs, Additions | $ [1] $ 0 $ 0 $ 0 $ 0    
Office | Commercial real estate            
Financing Receivable, Modifications [Line Items]            
TDRs, number 0 [1],[2] 0 [1],[2] 0 [1],[2] 1 [1],[2] 1 1
TDRs, Additions | $ $ 0 [1],[2] $ 0 [1],[2] $ 0 [1],[2] $ 790 [1],[2] $ 720 $ 790
Office | Commercial real estate | Extension at Below Market Terms            
Financing Receivable, Modifications [Line Items]            
TDRs, number [1] 0 0 0 1    
TDRs, Additions | $ [1] $ 0 $ 0 $ 0 $ 790    
Office | Commercial real estate | Reduction of Interest Rate            
Financing Receivable, Modifications [Line Items]            
TDRs, number [1] 0 0 0 0    
TDRs, Additions | $ [1] $ 0 $ 0 $ 0 $ 0    
Office | Commercial real estate | Modification to Interest Only Payments            
Financing Receivable, Modifications [Line Items]            
TDRs, number [1] 0 0 0 0    
TDRs, Additions | $ [1] $ 0 $ 0 $ 0 $ 0    
Office | Commercial real estate | Forgiveness of Debt            
Financing Receivable, Modifications [Line Items]            
TDRs, number [1] 0 0 0 0    
TDRs, Additions | $ [1] $ 0 $ 0 $ 0 $ 0    
Industrial | Commercial real estate            
Financing Receivable, Modifications [Line Items]            
TDRs, number 0 [1],[2] 0 [1],[2] 1 [1],[2] 1 [1],[2] 2 1
TDRs, Additions | $ $ 0 [1],[2] $ 0 [1],[2] $ 169 [1],[2] $ 1,078 [1],[2] $ 854 $ 1,078
Industrial | Commercial real estate | Extension at Below Market Terms            
Financing Receivable, Modifications [Line Items]            
TDRs, number [1] 0 0 1 1    
TDRs, Additions | $ [1] $ 0 $ 0 $ 169 $ 1,078    
Industrial | Commercial real estate | Reduction of Interest Rate            
Financing Receivable, Modifications [Line Items]            
TDRs, number [1] 0 0 0 0    
TDRs, Additions | $ [1] $ 0 $ 0 $ 0 $ 0    
Industrial | Commercial real estate | Modification to Interest Only Payments            
Financing Receivable, Modifications [Line Items]            
TDRs, number [1] 0 0 1 1    
TDRs, Additions | $ [1] $ 0 $ 0 $ 169 $ 1,078    
Industrial | Commercial real estate | Forgiveness of Debt            
Financing Receivable, Modifications [Line Items]            
TDRs, number [1] 0 0 0 0    
TDRs, Additions | $ [1] $ 0 $ 0 $ 0 $ 0    
Retail | Commercial real estate            
Financing Receivable, Modifications [Line Items]            
TDRs, number 0 [1],[2] 0 [1],[2] 0 [1],[2] 1 [1],[2] 0 1
TDRs, Additions | $ $ 0 [1],[2] $ 0 [1],[2] $ 0 [1],[2] $ 202 [1],[2] $ 0 $ 202
Retail | Commercial real estate | Extension at Below Market Terms            
Financing Receivable, Modifications [Line Items]            
TDRs, number [1] 0 0 0 1    
TDRs, Additions | $ [1] $ 0 $ 0 $ 0 $ 202    
Retail | Commercial real estate | Reduction of Interest Rate            
Financing Receivable, Modifications [Line Items]            
TDRs, number [1] 0 0 0 0    
TDRs, Additions | $ [1] $ 0 $ 0 $ 0 $ 0    
Retail | Commercial real estate | Modification to Interest Only Payments            
Financing Receivable, Modifications [Line Items]            
TDRs, number [1] 0 0 0 0    
TDRs, Additions | $ [1] $ 0 $ 0 $ 0 $ 0    
Retail | Commercial real estate | Forgiveness of Debt            
Financing Receivable, Modifications [Line Items]            
TDRs, number [1] 0 0 0 0    
TDRs, Additions | $ [1] $ 0 $ 0 $ 0 $ 0    
Multi-family | Commercial real estate            
Financing Receivable, Modifications [Line Items]            
TDRs, number 0 [1],[2] 0 [1],[2] 0 [1],[2] 1 [1],[2] 0 1
TDRs, Additions | $ $ 0 [1],[2] $ 0 [1],[2] $ 0 [1],[2] $ 181 [1],[2] $ 0 $ 181
Multi-family | Commercial real estate | Extension at Below Market Terms            
Financing Receivable, Modifications [Line Items]            
TDRs, number [1] 0 0 0 0    
TDRs, Additions | $ [1] $ 0 $ 0 $ 0 $ 0    
Multi-family | Commercial real estate | Reduction of Interest Rate            
Financing Receivable, Modifications [Line Items]            
TDRs, number [1] 0 0 0 1    
TDRs, Additions | $ [1] $ 0 $ 0 $ 0 $ 181    
Multi-family | Commercial real estate | Modification to Interest Only Payments            
Financing Receivable, Modifications [Line Items]            
TDRs, number [1] 0 0 0 0    
TDRs, Additions | $ [1] $ 0 $ 0 $ 0 $ 0    
Multi-family | Commercial real estate | Forgiveness of Debt            
Financing Receivable, Modifications [Line Items]            
TDRs, number [1] 0 0 0 0    
TDRs, Additions | $ [1] $ 0 $ 0 $ 0 $ 0    
Mixed use and other | Commercial real estate            
Financing Receivable, Modifications [Line Items]            
TDRs, number 0 [1],[2] 0 [1],[2] 0 [1],[2] 7 [1],[2] 0 10
TDRs, Additions | $ $ 0 [1],[2] $ 0 [1],[2] $ 0 [1],[2] $ 4,926 [1],[2] $ 0 $ 6,341
Mixed use and other | Commercial real estate | Extension at Below Market Terms            
Financing Receivable, Modifications [Line Items]            
TDRs, number [1] 0 0 0 3    
TDRs, Additions | $ [1] $ 0 $ 0 $ 0 $ 2,837    
Mixed use and other | Commercial real estate | Reduction of Interest Rate            
Financing Receivable, Modifications [Line Items]            
TDRs, number [1] 0 0 0 7    
TDRs, Additions | $ [1] $ 0 $ 0 $ 0 $ 4,926    
Mixed use and other | Commercial real estate | Modification to Interest Only Payments            
Financing Receivable, Modifications [Line Items]            
TDRs, number [1] 0 0 0 1    
TDRs, Additions | $ [1] $ 0 $ 0 $ 0 $ 1,273    
Mixed use and other | Commercial real estate | Forgiveness of Debt            
Financing Receivable, Modifications [Line Items]            
TDRs, number [1] 0 0 0 0    
TDRs, Additions | $ [1] $ 0 $ 0 $ 0 $ 0    
[1] Balances represent the recorded investment in the loan at the time of the restructuring.
[2] TDRs may have more than one modification representing a concession. As such, TDRs during the period may be represented in more than one of the categories noted above.
[3] Balances represent the recorded investment in the loan at the time of the restructuring.
[4] Total TDRs represent all loans restructured in TDRs during the previous twelve months from the date indicated.