Loans Receivable, Net (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Summary of the impaired loans by portfolio class of loans
Loans with a Specific Valuation Allowance, Recorded Balance	$ 62,759	$ 77,717
Loans with a Specific Valuation Allowance, Unpaid Principal Balance	70,261	85,514
Loans with a Specific Valuation Allowance, Average Balance	76,656	66,871
Loans without a Specific Valuation Allowance, Recorded Balance	138,976	180,942
Loans without a Specific Valuation Allowance, Unpaid Principal Balance	149,412	208,828
Loans without a Specific Valuation Allowance, Average Balance	162,505	168,983
Recorded balance	201,735	258,659
Unpaid principal balance	219,673	294,342
Specific valuation allowance	15,534	18,828
Average balance	239,161	235,854
Residential Real Estate [Member]
Summary of the impaired loans by portfolio class of loans
Loans with a Specific Valuation Allowance, Recorded Balance	7,334	11,111
Loans with a Specific Valuation Allowance, Unpaid Principal Balance	7,459	11,177
Loans with a Specific Valuation Allowance, Average Balance	12,797	10,330
Loans without a Specific Valuation Allowance, Recorded Balance	18,528	13,342
Loans without a Specific Valuation Allowance, Unpaid Principal Balance	19,613	14,741
Loans without a Specific Valuation Allowance, Average Balance	16,034	14,730
Recorded balance	25,862	24,453
Unpaid principal balance	27,072	25,918
Specific valuation allowance	1,680	2,659
Average balance	28,831	25,060
Commercial Real Estate [Member]
Summary of the impaired loans by portfolio class of loans
Loans with a Specific Valuation Allowance, Recorded Balance	29,595	39,971
Loans with a Specific Valuation Allowance, Unpaid Principal Balance	36,887	47,569
Loans with a Specific Valuation Allowance, Average Balance	36,164	38,805
Loans without a Specific Valuation Allowance, Recorded Balance	95,687	122,988
Loans without a Specific Valuation Allowance, Unpaid Principal Balance	102,798	139,962
Loans without a Specific Valuation Allowance, Average Balance	111,554	123,231
Recorded balance	125,282	162,959
Unpaid principal balance	139,685	187,531
Specific valuation allowance	7,716	9,756
Average balance	147,718	162,036
Other Commercial [Member]
Summary of the impaired loans by portfolio class of loans
Loans with a Specific Valuation Allowance, Recorded Balance	21,205	22,087
Loans with a Specific Valuation Allowance, Unpaid Principal Balance	21,278	22,196
Loans with a Specific Valuation Allowance, Average Balance	22,665	13,395
Loans without a Specific Valuation Allowance, Recorded Balance	12,388	27,875
Loans without a Specific Valuation Allowance, Unpaid Principal Balance	14,318	35,174
Loans without a Specific Valuation Allowance, Average Balance	19,733	19,963
Recorded balance	33,593	49,962
Unpaid principal balance	35,596	57,370
Specific valuation allowance	3,859	4,233
Average balance	42,398	33,358
Home Equity [Member]
Summary of the impaired loans by portfolio class of loans
Loans with a Specific Valuation Allowance, Recorded Balance	1,354	1,219
Loans with a Specific Valuation Allowance, Unpaid Principal Balance	1,362	1,238
Loans with a Specific Valuation Allowance, Average Balance	1,390	1,284
Loans without a Specific Valuation Allowance, Recorded Balance	9,720	13,531
Loans without a Specific Valuation Allowance, Unpaid Principal Balance	9,965	15,097
Loans without a Specific Valuation Allowance, Average Balance	11,993	8,975
Recorded balance	11,074	14,750
Unpaid principal balance	11,327	16,335
Specific valuation allowance	870	584
Average balance	13,383	10,259
Other Consumer [Member]
Summary of the impaired loans by portfolio class of loans
Loans with a Specific Valuation Allowance, Recorded Balance	3,271	3,329
Loans with a Specific Valuation Allowance, Unpaid Principal Balance	3,275	3,334
Loans with a Specific Valuation Allowance, Average Balance	3,640	3,057
Loans without a Specific Valuation Allowance, Recorded Balance	2,653	3,206
Loans without a Specific Valuation Allowance, Unpaid Principal Balance	2,718	3,854
Loans without a Specific Valuation Allowance, Average Balance	3,191	2,084
Recorded balance	5,924	6,535
Unpaid principal balance	5,993	7,188
Specific valuation allowance	1,409	1,596
Average balance	$ 6,831	$ 5,141