Loans Receivable and Allowance for Loan Losses (Details 4) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans 90 or more days delinquent	$ 57,757	$ 68,347	$ 95,836
Nonaccrual loans less than 90 days delinquent	49,464	51,865	35,269
Loans less than 90 days delinquent reviewed for impairment	44,418	33,282	22,804
TDRs less than 90 days delinquent not included elsewhere	22,205	30,817	25,449
Total impaired loans	173,844	184,311	179,358
Average recorded investment in impaired loans	175,013	190,476	204,273
Interest income recognized on impaired loans	5,955	6,524	6,036
Personal Banking
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans 90 or more days delinquent	35,026	34,701	40,448
Nonaccrual loans less than 90 days delinquent	4,371	1,476
TDRs less than 90 days delinquent not included elsewhere	5,182	4,363	361
Total impaired loans	44,579	40,540	40,809
Average recorded investment in impaired loans	42,798	40,454	42,645
Interest income recognized on impaired loans	1,150	1,060	754
Personal Banking | Residential mortgage loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans 90 or more days delinquent	24,625	24,286	28,221
Nonaccrual loans less than 90 days delinquent	2,652	797
TDRs less than 90 days delinquent not included elsewhere	3,372	3,011	361
Total impaired loans	30,649	28,094	28,582
Average recorded investment in impaired loans	29,994	28,078	30,731
Interest income recognized on impaired loans	723	683	538
Personal Banking | Home equity loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans 90 or more days delinquent	8,344	8,479	9,560
Nonaccrual loans less than 90 days delinquent	1,519	635
TDRs less than 90 days delinquent not included elsewhere	1,810	1,352
Total impaired loans	11,673	10,466	9,560
Average recorded investment in impaired loans	10,828	10,535	9,574
Interest income recognized on impaired loans	383	342	182
Personal Banking | Other consumer loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans 90 or more days delinquent	2,057	1,936	2,667
Nonaccrual loans less than 90 days delinquent	200	44
Total impaired loans	2,257	1,980	2,667
Average recorded investment in impaired loans	1,976	1,841	2,340
Interest income recognized on impaired loans	44	35	34
Business Banking
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans 90 or more days delinquent	22,731	33,646	55,388
Nonaccrual loans less than 90 days delinquent	45,093	50,389	35,269
Loans less than 90 days delinquent reviewed for impairment	44,418	33,282	22,804
TDRs less than 90 days delinquent not included elsewhere	17,023	26,454	25,088
Total impaired loans	129,265	143,771	138,549
Average recorded investment in impaired loans	132,215	150,022	161,628
Interest income recognized on impaired loans	4,805	5,464	5,282
Business Banking | Commercial real estate loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans 90 or more days delinquent	18,433	24,550	44,603
Nonaccrual loans less than 90 days delinquent	23,370	33,311	17,891
Loans less than 90 days delinquent reviewed for impairment	39,199	33,282	15,467
TDRs less than 90 days delinquent not included elsewhere	13,060	16,274	16,097
Total impaired loans	94,062	107,417	94,058
Average recorded investment in impaired loans	90,912	98,891	101,731
Interest income recognized on impaired loans	3,678	3,636	3,640
Business Banking | Commercial loans
Composition of impaired loans by portfolio segment and by class of financing receivable
Nonaccrual loans 90 or more days delinquent	4,298	9,096	10,785
Nonaccrual loans less than 90 days delinquent	21,723	17,078	17,378
Loans less than 90 days delinquent reviewed for impairment	5,219		7,337
TDRs less than 90 days delinquent not included elsewhere	3,963	10,180	8,991
Total impaired loans	35,203	36,354	44,491
Average recorded investment in impaired loans	41,303	51,131	59,897
Interest income recognized on impaired loans	$ 1,127	$ 1,828	$ 1,642