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Loans Receivable and Allowance for Loan Losses (Impaired Loans and Related Interest Income by Loan Portfolio Class) (Details) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	$ 11,084,000		$ 11,074,000
Impaired Financing Receivable, with Related Allowance, Recorded Investment			551,000
Impaired Financing Receivable, Recorded Investment	11,084,000		11,625,000
Unpaid Principal Balance, With no related allowance recorded	11,137,000		11,150,000
Unpaid Principal Balance, With an allowance recorded			551,000
Unpaid Principal Balance, Total	11,137,000		11,701,000
Average Recorded Investment, Total	11,101,000	13,878,000
Interest Income Recognized, Total	20,000	76,000
Financing Receivable, Modifications, Recorded Investment	5,300,000		5,600,000
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down	0		9,000,000,000
Financing Receivable, Modifications, Subsequent Default, Recorded Investment			0
New Loans Identified as Troubled Debt Restructurings			0
Residential Real Estate Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	253,000		270,000
Impaired Financing Receivable, Recorded Investment	253,000		270,000
Unpaid Principal Balance, With no related allowance recorded	265,000		286,000
Unpaid Principal Balance, Total	265,000		286,000
Average Recorded Investment, Total	262,000	296,000
Interest Income Recognized, Total	1,000	1,000
Commercial Real Estate Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment	10,831,000		10,494,000
Impaired Financing Receivable, with Related Allowance, Recorded Investment			551,000
Impaired Financing Receivable, Recorded Investment	10,831,000		11,045,000
Unpaid Principal Balance, With no related allowance recorded	10,872,000		10,554,000
Unpaid Principal Balance, With an allowance recorded			551,000
Unpaid Principal Balance, Total	10,872,000		11,105,000
Associated Allowance			9,000
Average Recorded Investment, Total	10,839,000	13,197,000
Interest Income Recognized, Total	19,000	75,000
Commercial Loans [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Recorded Investment			310,000
Impaired Financing Receivable, Recorded Investment			310,000
Unpaid Principal Balance, With no related allowance recorded			310,000
Unpaid Principal Balance, Total			310,000
Average Recorded Investment, Total		$ 385,000

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Loans Identified as Troubled Debt Restructurings

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The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings.

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Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default.

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Reflects the amount of the write-down related to a troubled debt restructuring.

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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.

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Amount of interest income recognized on a cash-basis method of accounting that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

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