Loans Receivable, Net (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2013	Jun. 30, 2013	Dec. 31, 2012
Summary of the impaired loans by portfolio class of loans
Loans with a specific valuation allowance, Recorded balance	$ 57,021	$ 57,021	$ 62,759
Loans with a specific valuation allowance, Unpaid principal balance	58,739	58,739	70,261
Loans with a specific valuation allowance, Average balance	56,118	58,331	76,656
Loans without a specific valuation allowance, Recorded balance	135,552	135,552	138,976
Loans without a specific valuation allowance, Unpaid principal balance	154,815	154,815	149,412
Loans without a specific valuation allowance, Average balance	137,096	137,722	162,505
Recorded balance	192,573	192,573	201,735
Unpaid principal balance	213,554	213,554	219,673
Specific valuation allowance	11,382	11,382	15,534
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	11,382	11,382	15,534
Average balance	193,214	196,053	239,161
Residential Real Estate [Member]
Summary of the impaired loans by portfolio class of loans
Loans with a specific valuation allowance, Recorded balance	6,975	6,975	7,334
Loans with a specific valuation allowance, Unpaid principal balance	7,199	7,199	7,459
Loans with a specific valuation allowance, Average balance	6,865	7,021	12,797
Loans without a specific valuation allowance, Recorded balance	17,744	17,744	18,528
Loans without a specific valuation allowance, Unpaid principal balance	18,846	18,846	19,613
Loans without a specific valuation allowance, Average balance	17,967	18,154	16,034
Recorded balance	24,719	24,719	25,862
Unpaid principal balance	26,045	26,045	27,072
Specific valuation allowance	1,026	1,026	1,680
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	1,026	1,026	1,680
Average balance	24,832	25,175	28,831
Commercial Real Estate [Member]
Summary of the impaired loans by portfolio class of loans
Loans with a specific valuation allowance, Recorded balance	24,857	24,857	29,595
Loans with a specific valuation allowance, Unpaid principal balance	25,954	25,954	36,887
Loans with a specific valuation allowance, Average balance	24,411	26,139	36,164
Loans without a specific valuation allowance, Recorded balance	92,979	92,979	95,687
Loans without a specific valuation allowance, Unpaid principal balance	107,676	107,676	102,798
Loans without a specific valuation allowance, Average balance	95,185	95,352	111,554
Recorded balance	117,836	117,836	125,282
Unpaid principal balance	133,630	133,630	139,685
Specific valuation allowance	6,100	6,100	7,716
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	6,100	6,100	7,716
Average balance	119,596	121,491	147,718
Other Commercial [Member]
Summary of the impaired loans by portfolio class of loans
Loans with a specific valuation allowance, Recorded balance	21,191	21,191	21,205
Loans with a specific valuation allowance, Unpaid principal balance	21,298	21,298	21,278
Loans with a specific valuation allowance, Average balance	20,856	20,972	22,665
Loans without a specific valuation allowance, Recorded balance	15,514	15,514	12,388
Loans without a specific valuation allowance, Unpaid principal balance	17,731	17,731	14,318
Loans without a specific valuation allowance, Average balance	13,816	13,340	19,733
Recorded balance	36,705	36,705	33,593
Unpaid principal balance	39,029	39,029	35,596
Specific valuation allowance	3,553	3,553	3,859
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	3,553	3,553	3,859
Average balance	34,672	34,312	42,398
Home Equity [Member]
Summary of the impaired loans by portfolio class of loans
Loans with a specific valuation allowance, Recorded balance	318	318	1,354
Loans with a specific valuation allowance, Unpaid principal balance	321	321	1,362
Loans with a specific valuation allowance, Average balance	460	758	1,390
Loans without a specific valuation allowance, Recorded balance	8,114	8,114	9,720
Loans without a specific valuation allowance, Unpaid principal balance	9,318	9,318	9,965
Loans without a specific valuation allowance, Average balance	8,466	8,883	11,993
Recorded balance	8,432	8,432	11,074
Unpaid principal balance	9,639	9,639	11,327
Specific valuation allowance	24	24	870
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	24	24	870
Average balance	8,926	9,641	13,383
Other Consumer [Member]
Summary of the impaired loans by portfolio class of loans
Loans with a specific valuation allowance, Recorded balance	3,680	3,680	3,271
Loans with a specific valuation allowance, Unpaid principal balance	3,967	3,967	3,275
Loans with a specific valuation allowance, Average balance	3,526	3,441	3,640
Loans without a specific valuation allowance, Recorded balance	1,201	1,201	2,653
Loans without a specific valuation allowance, Unpaid principal balance	1,244	1,244	2,718
Loans without a specific valuation allowance, Average balance	1,662	1,993	3,191
Recorded balance	4,881	4,881	5,924
Unpaid principal balance	5,211	5,211	5,993
Specific valuation allowance	679	679	1,409
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	679	679	1,409
Average balance	$ 5,188	$ 5,434	$ 6,831