Loans Receivable, Net (Details 1) (USD $) In Thousands	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2011	Jun. 30, 2011	Dec. 31, 2010
Summary of the impaired loans by portfolio class of loans
Recorded balance	$ 208,892	$ 208,892	$ 225,052
Unpaid principal balance	246,442	246,442	259,475
Valuation allowance	13,895	13,895	16,871
Average impaired loans	213,817	217,562	223,556
Residential Real Estate [Member] | Loans Without A Specific Valuation Allowance [Member]
Summary of the impaired loans by portfolio class of loans
Recorded balance	14,637	14,637	17,007
Unpaid principal balance	16,614	16,614	20,399
Average impaired loans	14,478	15,321	18,402
Commercial Real Estate [Member] | Loans Without A Specific Valuation Allowance [Member]
Summary of the impaired loans by portfolio class of loans
Recorded balance	113,673	113,673	121,446
Unpaid principal balance	132,408	132,408	142,141
Average impaired loans	116,356	118,053	109,136
Other Commercial [Member] | Loans Without A Specific Valuation Allowance [Member]
Summary of the impaired loans by portfolio class of loans
Recorded balance	17,860	17,860	15,460
Unpaid principal balance	25,178	25,178	16,909
Average impaired loans	16,293	16,015	17,412
Home Equity [Member] | Loans Without A Specific Valuation Allowance [Member]
Summary of the impaired loans by portfolio class of loans
Recorded balance	8,351	8,351	5,406
Unpaid principal balance	9,367	9,367	6,204
Average impaired loans	8,231	7,290	5,696
Other Consumer [Member] | Loans Without A Specific Valuation Allowance [Member]
Summary of the impaired loans by portfolio class of loans
Recorded balance	1,521	1,521	563
Unpaid principal balance	2,216	2,216	627
Average impaired loans	1,463	1,163	1,718
Loans Without A Specific Valuation Allowance [Member]
Summary of the impaired loans by portfolio class of loans
Recorded balance	156,042	156,042	159,882
Unpaid principal balance	185,783	185,783	186,280
Average impaired loans	156,821	157,842	152,364
Residential Real Estate [Member] | Loans With A Specific Valuation Allowance [Member]
Summary of the impaired loans by portfolio class of loans
Recorded balance	10,326	10,326	12,473
Unpaid principal balance	10,350	10,350	12,970
Average impaired loans	7,531	9,178	10,599
Commercial Real Estate [Member] | Loans With A Specific Valuation Allowance [Member]
Summary of the impaired loans by portfolio class of loans
Recorded balance	32,871	32,871	44,338
Unpaid principal balance	40,049	40,049	50,614
Average impaired loans	35,989	38,772	51,627
Other Commercial [Member] | Loans With A Specific Valuation Allowance [Member]
Summary of the impaired loans by portfolio class of loans
Recorded balance	5,140	5,140	5,898
Unpaid principal balance	5,621	5,621	6,934
Average impaired loans	8,299	7,498	5,773
Home Equity [Member] | Loans With A Specific Valuation Allowance [Member]
Summary of the impaired loans by portfolio class of loans
Recorded balance	778	778	732
Unpaid principal balance	863	863	945
Average impaired loans	1,278	1,096	1,514
Other Consumer [Member] | Loans With A Specific Valuation Allowance [Member]
Summary of the impaired loans by portfolio class of loans
Recorded balance	3,735	3,735	1,729
Unpaid principal balance	3,776	3,776	1,732
Average impaired loans	3,899	3,176	1,679
Loans With A Specific Valuation Allowance [Member]
Summary of the impaired loans by portfolio class of loans
Recorded balance	52,850	52,850	65,170
Unpaid principal balance	60,659	60,659	73,195
Average impaired loans	56,996	59,720	71,192
Residential Real Estate [Member]
Summary of the impaired loans by portfolio class of loans
Recorded balance	24,963	24,963	29,480
Unpaid principal balance	26,964	26,964	33,369
Valuation allowance	1,606	1,606	2,793
Average impaired loans	22,009	24,499	29,001
Commercial Real Estate [Member]
Summary of the impaired loans by portfolio class of loans
Recorded balance	146,544	146,544	165,784
Unpaid principal balance	172,457	172,457	192,755
Valuation allowance	9,431	9,431	10,184
Average impaired loans	152,345	156,825	160,763
Other Commercial [Member]
Summary of the impaired loans by portfolio class of loans
Recorded balance	23,000	23,000	21,358
Unpaid principal balance	30,799	30,799	23,843
Valuation allowance	1,480	1,480	2,649
Average impaired loans	24,592	23,513	23,185
Home Equity [Member]
Summary of the impaired loans by portfolio class of loans
Recorded balance	9,129	9,129	6,138
Unpaid principal balance	10,230	10,230	7,149
Valuation allowance	216	216	504
Average impaired loans	9,509	8,386	7,210
Other Consumer [Member]
Summary of the impaired loans by portfolio class of loans
Recorded balance	5,256	5,256	2,292
Unpaid principal balance	5,992	5,992	2,359
Valuation allowance	1,162	1,162	741
Average impaired loans	$ 5,362	$ 4,339	$ 3,397