Loans (Narrative) (Details) (USD $)	6 Months Ended	12 Months Ended
	Dec. 31, 2012 loan	Jun. 30, 2012 loan
Financing Receivable, Allowance for Credit Losses [Line Items]
Maximum Loan-To-Value Ratio	80.00%
Financing Receivable, Recorded Investment, Nonaccrual Status	$ 6,722,000	$ 6,893,000
Loans in the process of foreclosure	3,200,000
Nonaccrual Loans Making Payments Pursuant To Forbearance Agreements	1,100,000
Financing Receivable, Recorded Investment, 90 Days Past Due and Still Accruing	353,000	124,000
Financing Receivable, Recorded Investment 90 Days Past Due And Still Accruing, Number of Contracts	3	2
Less than 90 days delinquent [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Recorded Investment, Nonaccrual Status	$ 2,400,000
The Bank of Greene County [Member] | Residential mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Maximum Loan-To-Value Ratio	95.00%