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Loans receivable - Loan Portfolio by Portfolio Segment and by Class of Financing Receivable (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans receivable $ 7,798,566   $ 7,222,121      
Allowance for loan losses 63,246   62,672      
Nonaccrual loans 86,272   71,662      
Loans past due 90 days or more and still accruing 103   1,334      
TDRs 46,595 $ 49,113 51,115 $ 49,338 $ 56,184 $ 61,788
Allowance related to TDRs 4,697   4,682      
Additional commitments to customers with loans classified as TDRs 300   320      
Nonaccrual TDRs 17,374   21,100 $ 23,184    
Personal Banking            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans receivable 4,796,630   4,448,287      
Allowance for loan losses 18,510   16,350      
Nonaccrual loans 30,298   30,746      
Loans past due 90 days or more and still accruing 95   980      
TDRs 9,136   8,658      
Allowance related to TDRs 1,206   1,794      
Additional commitments to customers with loans classified as TDRs 3   0      
Personal Banking | Residential mortgage loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans receivable 2,819,013   2,740,892      
Allowance for loan losses 4,080   4,710      
Nonaccrual loans 17,919   19,772      
Loans past due 90 days or more and still accruing 0   4      
TDRs 7,174   6,360      
Allowance related to TDRs 735   1,189      
Additional commitments to customers with loans classified as TDRs 0   0      
Personal Banking | Home equity loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans receivable 1,349,105   1,187,106      
Allowance for loan losses 4,690   4,042      
Nonaccrual loans 8,100   7,522      
Loans past due 90 days or more and still accruing 0   0      
TDRs 1,962   2,298      
Allowance related to TDRs 471   605      
Additional commitments to customers with loans classified as TDRs 3   0      
Personal Banking | Consumer loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans receivable 628,512   520,289      
Allowance for loan losses 9,740   7,598      
Nonaccrual loans 4,279   3,452      
Loans past due 90 days or more and still accruing 95   976      
TDRs 0   0      
Allowance related to TDRs 0   0      
Additional commitments to customers with loans classified as TDRs 0   0      
Commercial Banking            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans receivable 3,001,936   2,773,834      
Allowance for loan losses 44,736   46,322      
Nonaccrual loans 55,974   40,916      
Loans past due 90 days or more and still accruing 8   354      
TDRs 37,459   42,457      
Allowance related to TDRs 3,491   2,888      
Additional commitments to customers with loans classified as TDRs 297   320      
Commercial Banking | Commercial real estate loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans receivable 2,464,681   2,351,434      
Allowance for loan losses 26,952   33,787      
Nonaccrual loans 42,066   33,421      
Loans past due 90 days or more and still accruing 0   206      
TDRs 26,435   31,970      
Allowance related to TDRs 2,038   2,257      
Additional commitments to customers with loans classified as TDRs 280   241      
Commercial Banking | Commercial loans            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Total loans receivable 537,255   422,400      
Allowance for loan losses 17,784   12,535      
Nonaccrual loans 13,908   7,495      
Loans past due 90 days or more and still accruing 8   148      
TDRs 11,024   10,487      
Allowance related to TDRs 1,453   631      
Additional commitments to customers with loans classified as TDRs $ 17   $ 79