Loans Receivable and Allowance for Loan Losses (Details 9) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Average recorded investment, interest income recognized and cash basis interest income related to impaired mortgage loans by segment and class
Average Recorded Investment	$ 381,146	$ 399,956	$ 383,923	$ 404,103
Interest Income Recognized	2,911	2,809	5,782	5,456
Cash Basis Interest Income	2,933	3,002	5,917	5,865
Consumer and other loans \| Home equity lines of credit
Average recorded investment, interest income recognized and cash basis interest income related to impaired mortgage loans by segment and class
Average Recorded Investment, Loans with an allowance recorded	5,067		5,030
Interest Income Recognized, Loans with an allowance recorded	3		13
Cash Basis Interest Income, Loans with an allowance recorded	7		21
Mortgage loans \| Residential \| Full documentation interest-only loans
Average recorded investment, interest income recognized and cash basis interest income related to impaired mortgage loans by segment and class
Average Recorded Investment, Loans with an allowance recorded	105,897	103,076	107,224	102,934
Average Recorded Investment, Loans without an allowance recorded		19,119		19,244
Interest Income Recognized, Loans with an allowance recorded	618	608	1,222	1,157
Interest Income Recognized, Loans without an allowance recorded		96		166
Cash Basis Interest Income, Loans with an allowance recorded	608	630	1,244	1,262
Cash Basis Interest Income, Loans without an allowance recorded		91		170
Mortgage loans \| Residential \| Full documentation amortizing loans
Average recorded investment, interest income recognized and cash basis interest income related to impaired mortgage loans by segment and class
Average Recorded Investment, Loans with an allowance recorded	41,213	27,316	39,505	27,615
Average Recorded Investment, Loans without an allowance recorded	913	6,153	609	5,861
Interest Income Recognized, Loans with an allowance recorded	307	171	653	289
Interest Income Recognized, Loans without an allowance recorded		17		67
Cash Basis Interest Income, Loans with an allowance recorded	306	173	645	305
Cash Basis Interest Income, Loans without an allowance recorded		15		65
Mortgage loans \| Residential \| Reduced documentation interest-only loans
Average recorded investment, interest income recognized and cash basis interest income related to impaired mortgage loans by segment and class
Average Recorded Investment, Loans with an allowance recorded	132,784	150,542	135,308	149,207
Average Recorded Investment, Loans without an allowance recorded				2,781
Interest Income Recognized, Loans with an allowance recorded	1,087	992	2,163	1,897
Cash Basis Interest Income, Loans with an allowance recorded	1,083	1,018	2,146	2,042
Mortgage loans \| Residential \| Reduced documentation amortizing loans
Average recorded investment, interest income recognized and cash basis interest income related to impaired mortgage loans by segment and class
Average Recorded Investment, Loans with an allowance recorded	24,981	25,243	25,189	25,870
Interest Income Recognized, Loans with an allowance recorded	134	209	265	297
Cash Basis Interest Income, Loans with an allowance recorded	138	210	263	322
Mortgage loans \| Multi-Family
Average recorded investment, interest income recognized and cash basis interest income related to impaired mortgage loans by segment and class
Average Recorded Investment, Loans with an allowance recorded	37,277	16,380	31,434	17,488
Average Recorded Investment, Loans without an allowance recorded	11,782	32,404	18,785	33,740
Interest Income Recognized, Loans with an allowance recorded	364	180	730	373
Interest Income Recognized, Loans without an allowance recorded	136	346	274	745
Cash Basis Interest Income, Loans with an allowance recorded	380	195	764	380
Cash Basis Interest Income, Loans without an allowance recorded	137	389	275	796
Mortgage loans \| Commercial Real Estate
Average recorded investment, interest income recognized and cash basis interest income related to impaired mortgage loans by segment and class
Average Recorded Investment, Loans with an allowance recorded	21,232	8,586	16,084	9,335
Average Recorded Investment, Loans without an allowance recorded		11,137	4,755	10,028
Interest Income Recognized, Loans with an allowance recorded	262	139	462	240
Interest Income Recognized, Loans without an allowance recorded		51		225
Cash Basis Interest Income, Loans with an allowance recorded	274	147	559	264
Cash Basis Interest Income, Loans without an allowance recorded		$ 134		$ 259

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Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5212-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 17

-URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5258-111524

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Amount of interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

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