Loans Receivable, Net (Details 3) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Loan portfolio aging analysis
Accruing loans 30-59 days past due	$ 19,937	$ 31,386
Accruing loans 60-89 days past due	8,497	17,700
Accruing loans 90 days or more past due	3,271	1,413
Non-accrual loans	115,856	133,689
Total past due and non-accrual loans	147,561	184,188
Current loans receivable	3,260,533	3,281,947
Total loans receivable	3,408,094	3,466,135
Residential Real Estate [Member]
Loan portfolio aging analysis
Accruing loans 30-59 days past due	663	9,038
Accruing loans 60-89 days past due	1,150	2,678
Accruing loans 90 days or more past due	551	59
Non-accrual loans	18,941	11,881
Total past due and non-accrual loans	21,305	23,656
Current loans receivable	506,872	493,151
Total loans receivable	528,177	516,807
Commercial Real Estate [Member]
Loan portfolio aging analysis
Accruing loans 30-59 days past due	11,959	12,683
Accruing loans 60-89 days past due	3,946	11,660
Accruing loans 90 days or more past due	787	108
Non-accrual loans	71,721	87,956
Total past due and non-accrual loans	88,413	112,407
Current loans receivable	1,563,639	1,559,652
Total loans receivable	1,652,052	1,672,059
Other Commercial [Member]
Loan portfolio aging analysis
Accruing loans 30-59 days past due	3,828	3,279
Accruing loans 60-89 days past due	984	1,034
Accruing loans 90 days or more past due	1,301	1,060
Non-accrual loans	14,178	21,685
Total past due and non-accrual loans	20,291	27,058
Current loans receivable	600,616	596,810
Total loans receivable	620,907	623,868
Home Equity [Member]
Loan portfolio aging analysis
Accruing loans 30-59 days past due	2,441	4,092
Accruing loans 60-89 days past due	1,721	1,276
Accruing loans 90 days or more past due	356	156
Non-accrual loans	7,738	10,272
Total past due and non-accrual loans	12,256	15,796
Current loans receivable	394,648	424,773
Total loans receivable	406,904	440,569
Other Consumer [Member]
Loan portfolio aging analysis
Accruing loans 30-59 days past due	1,046	2,294
Accruing loans 60-89 days past due	696	1,052
Accruing loans 90 days or more past due	276	30
Non-accrual loans	3,278	1,895
Total past due and non-accrual loans	5,296	5,271
Current loans receivable	194,758	207,561
Total loans receivable	$ 200,054	$ 212,832