Camco Financial Corporation Condensed Financial Information (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
ASSETS
Securities available-for-sale, at market	$ 85,298	$ 17,845
Office premises and equipment - net	8,105	8,645
Cash surrender value of life insurance	20,585	19,893
Total assets	764,259	767,018
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued liabilities	10,453	9,769
Total liabilities	704,532	721,413
Stockholders' equity	59,727	45,605	46,103	60,514
Total liabilities and stockholders' equity	764,259	767,018
Parent Company [Member]
ASSETS
Securities available-for-sale, at market	44	52
Investment in Advantage	62,726	48,186
Office premises and equipment - net	7	1
Cash surrender value of life insurance	1,719	1,669
Other assets	1,446	72
Total assets	66,358	51,826
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued liabilities	1,631	1,221
Borrowings	5,000	5,000
Total liabilities	6,631	6,221
Stockholders' equity	59,727	45,605
Total liabilities and stockholders' equity	66,358	51,826
Parent Company [Member] | Advantage [Member]
ASSETS
Cash in Advantage	$ 416	$ 946