Loans Receivable and Allowance for Loan Losses (Details 5) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Evaluation of impaired loans by portfolio segment and by class of financing receivable
Loans collectively evaluated for impairment	$ 5,691,218	$ 5,574,501
Loans individually evaluated for impairment	115,073	127,979
Loans individually evaluated for impairment for which there is a related impairment reserve	74,633	103,694
Related impairment reserve	11,903	16,607
Loans individually evaluated for impairment for which there is no related impairment reserve	40,440	24,285
Personal Banking
Evaluation of impaired loans by portfolio segment and by class of financing receivable
Loans collectively evaluated for impairment	3,787,814	3,720,717
Loans individually evaluated for impairment	7,477	6,936
Loans individually evaluated for impairment for which there is a related impairment reserve	7,477	6,936
Related impairment reserve	1,470	1,181
Personal Banking | Residential mortgage loans
Evaluation of impaired loans by portfolio segment and by class of financing receivable
Loans collectively evaluated for impairment	2,477,888	2,410,604
Loans individually evaluated for impairment	5,116	5,045
Loans individually evaluated for impairment for which there is a related impairment reserve	5,116	5,045
Related impairment reserve	1,136	992
Personal Banking | Home equity loans
Evaluation of impaired loans by portfolio segment and by class of financing receivable
Loans collectively evaluated for impairment	1,081,699	1,081,763
Loans individually evaluated for impairment	2,240	1,891
Loans individually evaluated for impairment for which there is a related impairment reserve	2,240	1,891
Related impairment reserve	333	189
Personal Banking | Other consumer loans
Evaluation of impaired loans by portfolio segment and by class of financing receivable
Loans collectively evaluated for impairment	228,227	228,350
Loans individually evaluated for impairment	121
Loans individually evaluated for impairment for which there is a related impairment reserve	121
Related impairment reserve	1
Business Banking
Evaluation of impaired loans by portfolio segment and by class of financing receivable
Loans collectively evaluated for impairment	1,903,404	1,853,784
Loans individually evaluated for impairment	107,596	121,043
Loans individually evaluated for impairment for which there is a related impairment reserve	67,156	96,758
Related impairment reserve	10,433	15,426
Loans individually evaluated for impairment for which there is no related impairment reserve	40,440	24,285
Business Banking | Commercial real estate loans
Evaluation of impaired loans by portfolio segment and by class of financing receivable
Loans collectively evaluated for impairment	1,532,117	1,501,032
Loans individually evaluated for impairment	76,282	84,801
Loans individually evaluated for impairment for which there is a related impairment reserve	45,761	61,136
Related impairment reserve	6,300	9,789
Loans individually evaluated for impairment for which there is no related impairment reserve	30,521	23,665
Business Banking | Commercial loans
Evaluation of impaired loans by portfolio segment and by class of financing receivable
Loans collectively evaluated for impairment	371,287	352,752
Loans individually evaluated for impairment	31,314	36,242
Loans individually evaluated for impairment for which there is a related impairment reserve	21,395	35,622
Related impairment reserve	4,133	5,637
Loans individually evaluated for impairment for which there is no related impairment reserve	$ 9,919	$ 620