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Loans Receivable, Part V (Details) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2013
Loan
Consecutive_contractual_payment
Troubled_Debt
Mar. 31, 2012
Loan
Troubled_Debt
Dec. 31, 2012
Consecutive_contractual_payment
Loan
Troubled_Debt
Dec. 31, 2011
Loan
Troubled_Debt
Troubled Debt Restructuring Note, Debtor [Abstract]        
Amount of troubled debt restructuring $ 55,794,000   $ 59,621,000 $ 55,412,000
Total number of troubled debt restructurings 127   137 150
Period of principal forbearance, reduction in interest rate or both included in typical restructured terms 6 months   6 months  
Valuation allowance with respect to troubled debt restructurings 4,400,000   6,400,000 6,200,000
Minimum number of consecutive contractual payments received prior to consideration for a return to accrual status 6   6  
Troubled Debt Restructurings by Concession Type [Abstract]        
Loans Receivable, Modifications, Loans Performing in Accordance with Modified Terms 49,877,000   55,609,000 46,652,000
Number of loans performing in accordance with modified terms 91   123 117
Loans Receivable, Modifications, Loans in Default 5,917,000   4,012,000 8,760,000
Number of Loans in Default 36   14 33
Loans Receivable, Modifications, Total 55,794,000   59,621,000 55,412,000
Number of Loans, Total 127   137 150
Data on Troubled Debt Restructuring [Abstract]        
Loans modified as a troubled debt restructure 343,000 2,971,000 34,117,000 34,451,000
Number of loans modified as a troubled debt restructuring 3 7 37 101
Trouble debt restructuring modified within the past twelve months for which there was a default 0 520,000 0 702,000
Number of trouble debt restructuring modified within the past twelve months for which there was a default 0 1 0 6
Non-accrual Loans [Abstract]        
Total non-accrual loans 65,964,000   74,668,000 78,218,000
Ratio of total non-accrual loans to total loans, net of allowance (in hundredths) 5.86%   6.59% 6.43%
Ratio of total non-accrual loans and performing troubled debt restructurings to total loans receivable (in hundredths) 7.83%   8.00% 8.45%
Ratio of total non-accrual loans to total assets (in hundredths) 4.05%   4.50% 4.57%
One-to Four-Family [Member]
        
Troubled Debt Restructuring Note, Debtor [Abstract]        
Amount of troubled debt restructuring 29,154,000   31,768,000 35,066,000
Total number of troubled debt restructurings 106   112 119
Data on Troubled Debt Restructuring [Abstract]        
Loans modified as a troubled debt restructure 343,000 2,971,000 14,821,000 23,049,000
Number of loans modified as a troubled debt restructuring 3 7 27 86
Trouble debt restructuring modified within the past twelve months for which there was a default 0 520,000 0 702,000
Number of trouble debt restructuring modified within the past twelve months for which there was a default 0 1 0 6
Non-accrual Loans [Abstract]        
Total non-accrual loans 41,985,000   46,467,000 55,609,000
Over Four-Family [Member]
        
Troubled Debt Restructuring Note, Debtor [Abstract]        
Amount of troubled debt restructuring 22,751,000   23,947,000 17,298,000
Total number of troubled debt restructurings 13   17 21
Data on Troubled Debt Restructuring [Abstract]        
Loans modified as a troubled debt restructure     18,520,000 10,340,000
Number of loans modified as a troubled debt restructuring     8 12
Non-accrual Loans [Abstract]        
Total non-accrual loans 19,067,000   23,205,000 13,680,000
Home Equity [Member]
        
Troubled Debt Restructuring Note, Debtor [Abstract]        
Amount of troubled debt restructuring 975,000   986,000 1,067,000
Total number of troubled debt restructurings 3   3 5
Data on Troubled Debt Restructuring [Abstract]        
Loans modified as a troubled debt restructure     12,000 1,062,000
Number of loans modified as a troubled debt restructuring     1 3
Non-accrual Loans [Abstract]        
Total non-accrual loans 1,539,000   1,578,000 1,334,000
Land and Land Improvements [Member]
        
Troubled Debt Restructuring Note, Debtor [Abstract]        
Amount of troubled debt restructuring 2,249,000   2,252,000 1,487,000
Total number of troubled debt restructurings 3   3 2
Data on Troubled Debt Restructuring [Abstract]        
Loans modified as a troubled debt restructure     764,000 0
Number of loans modified as a troubled debt restructuring     1 0
Non-accrual Loans [Abstract]        
Total non-accrual loans 2,175,000   2,215,000 6,946,000
Commercial Real Estate [Member]
        
Troubled Debt Restructuring Note, Debtor [Abstract]        
Amount of troubled debt restructuring 665,000   668,000 452,000
Total number of troubled debt restructurings 2   2 1
Non-accrual Loans [Abstract]        
Total non-accrual loans 665,000   668,000 514,000
Consumer [Member]
        
Non-accrual Loans [Abstract]        
Total non-accrual loans 22,000   24,000 0
Commercial Loans [Member]
        
Troubled Debt Restructuring Note, Debtor [Abstract]        
Amount of troubled debt restructuring       42,000
Total number of troubled debt restructurings       2
Non-accrual Loans [Abstract]        
Total non-accrual loans 511,000   511,000 135,000
Accruing [Member]
        
Troubled Debt Restructuring Note, Debtor [Abstract]        
Amount of troubled debt restructuring 22,110,000   16,011,000 24,589,000
Total number of troubled debt restructurings 28   23 41
Accruing [Member] | One-to Four-Family [Member]
        
Troubled Debt Restructuring Note, Debtor [Abstract]        
Amount of troubled debt restructuring 13,212,000   9,921,000 8,293,000
Total number of troubled debt restructurings 21   17 26
Accruing [Member] | Over Four-Family [Member]
        
Troubled Debt Restructuring Note, Debtor [Abstract]        
Amount of troubled debt restructuring 6,727,000   3,917,000 14,845,000
Total number of troubled debt restructurings 5   4 13
Accruing [Member] | Home Equity [Member]
        
Troubled Debt Restructuring Note, Debtor [Abstract]        
Amount of troubled debt restructuring 0   0 43,000
Total number of troubled debt restructurings 0   0 1
Accruing [Member] | Land and Land Improvements [Member]
        
Troubled Debt Restructuring Note, Debtor [Abstract]        
Amount of troubled debt restructuring 2,171,000   2,173,000 1,408,000
Total number of troubled debt restructurings 2   2 1
Accruing [Member] | Commercial Real Estate [Member]
        
Troubled Debt Restructuring Note, Debtor [Abstract]        
Amount of troubled debt restructuring 0   0 0
Total number of troubled debt restructurings 0   0 0
Accruing [Member] | Commercial Loans [Member]
        
Troubled Debt Restructuring Note, Debtor [Abstract]        
Amount of troubled debt restructuring       0
Total number of troubled debt restructurings       0
Non Accruing [Member]
        
Troubled Debt Restructuring Note, Debtor [Abstract]        
Amount of troubled debt restructuring 33,684,000   43,610,000 30,823,000
Total number of troubled debt restructurings 99   114 109
Non Accruing [Member] | One-to Four-Family [Member]
        
Troubled Debt Restructuring Note, Debtor [Abstract]        
Amount of troubled debt restructuring 15,942,000   21,847,000 26,773,000
Total number of troubled debt restructurings 85   95 93
Non Accruing [Member] | Over Four-Family [Member]
        
Troubled Debt Restructuring Note, Debtor [Abstract]        
Amount of troubled debt restructuring 16,024,000   20,030,000 2,453,000
Total number of troubled debt restructurings 8   13 8
Non Accruing [Member] | Home Equity [Member]
        
Troubled Debt Restructuring Note, Debtor [Abstract]        
Amount of troubled debt restructuring 975,000   986,000 1,024,000
Total number of troubled debt restructurings 3   3 4
Non Accruing [Member] | Land and Land Improvements [Member]
        
Troubled Debt Restructuring Note, Debtor [Abstract]        
Amount of troubled debt restructuring 78,000   79,000 79,000
Total number of troubled debt restructurings 1   1 1
Non Accruing [Member] | Commercial Real Estate [Member]
        
Troubled Debt Restructuring Note, Debtor [Abstract]        
Amount of troubled debt restructuring 665,000   668,000 452,000
Total number of troubled debt restructurings 2   2 1
Non Accruing [Member] | Commercial Loans [Member]
        
Troubled Debt Restructuring Note, Debtor [Abstract]        
Amount of troubled debt restructuring       42,000
Total number of troubled debt restructurings       2
Interest Reduction and Principal Forbearance [Member]
        
Troubled Debt Restructurings by Concession Type [Abstract]        
Loans Receivable, Modifications, Loans Performing in Accordance with Modified Terms 24,809,000   26,051,000 22,752,000
Number of loans performing in accordance with modified terms 70   77 61
Loans Receivable, Modifications, Loans in Default 2,266,000   2,770,000 6,564,000
Number of Loans in Default 9   11 22
Loans Receivable, Modifications, Total 27,075,000   28,821,000 29,316,000
Number of Loans, Total 79   88 83
Interest Reduction [Member]
        
Troubled Debt Restructurings by Concession Type [Abstract]        
Loans Receivable, Modifications, Loans Performing in Accordance with Modified Terms 7,694,000   11,984,000 20,006,000
Number of loans performing in accordance with modified terms 10   35 27
Loans Receivable, Modifications, Loans in Default 3,304,000   894,000 425,000
Number of Loans in Default 26   2 2
Loans Receivable, Modifications, Total 10,998,000   12,878,000 20,431,000
Number of Loans, Total 36   37 29
Principal Forbearance [Member]
        
Troubled Debt Restructurings by Concession Type [Abstract]        
Loans Receivable, Modifications, Loans Performing in Accordance with Modified Terms 17,374,000   17,574,000 3,894,000
Number of loans performing in accordance with modified terms 11   11 29
Loans Receivable, Modifications, Loans in Default 347,000   348,000 1,771,000
Number of Loans in Default 1   1 9
Loans Receivable, Modifications, Total $ 17,721,000   $ 17,922,000 $ 5,665,000
Number of Loans, Total 12   12 38