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Loans receivable (Details 2) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Changes in allowance for losses on allocated loans receivable    
Balance at the beginning of the period $ 71,348 $ 73,219
Provision 7,485 7,158
Charge-offs (4,249) (9,123)
Recoveries 1,650 755
Balance at the end of the period 76,234 72,009
Personal Banking
   
Changes in allowance for losses on allocated loans receivable    
Balance at the beginning of the period 20,607 21,452
Provision 1,256 1,472
Charge-offs (2,547) (2,453)
Recoveries 389 478
Balance at the end of the period 19,705 20,949
Personal Banking | Residential mortgage loans
   
Changes in allowance for losses on allocated loans receivable    
Balance at the beginning of the period 7,875 8,002
Provision 35 452
Charge-offs (459) (679)
Recoveries 16 103
Balance at the end of the period 7,467 7,878
Personal Banking | Home equity loans
   
Changes in allowance for losses on allocated loans receivable    
Balance at the beginning of the period 7,245 8,294
Provision 37 224
Charge-offs (372) (370)
Recoveries 48 63
Balance at the end of the period 6,958 8,211
Personal Banking | Other consumer loans
   
Changes in allowance for losses on allocated loans receivable    
Balance at the beginning of the period 5,487 5,156
Provision 1,184 796
Charge-offs (1,716) (1,404)
Recoveries 325 312
Balance at the end of the period 5,280 4,860
Business Banking
   
Changes in allowance for losses on allocated loans receivable    
Balance at the beginning of the period 46,079 47,741
Provision 6,740 5,685
Charge-offs (1,702) (6,670)
Recoveries 1,261 277
Balance at the end of the period 52,378 47,033
Business Banking | Commercial real estate loans
   
Changes in allowance for losses on allocated loans receivable    
Balance at the beginning of the period 34,969 34,499
Provision 1,551 4,857
Charge-offs (932) (3,990)
Recoveries 621 194
Balance at the end of the period 36,209 35,560
Business Banking | Commercial loans
   
Changes in allowance for losses on allocated loans receivable    
Balance at the beginning of the period 11,110 13,242
Provision 5,189 828
Charge-offs (770) (2,680)
Recoveries 640 83
Balance at the end of the period 16,169 11,473
Unallocated
   
Changes in allowance for losses on allocated loans receivable    
Balance at the beginning of the period 4,662 4,026
Provision (511) 1
Balance at the end of the period $ 4,151 $ 4,027