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Summary of Significant Accounting Policies Restrictions on Cash (Details) (USD $)	Jan. 02, 2013	Dec. 31, 2012	Dec. 31, 2011	Jul. 31, 2010
Summary of Significant Accounting Policies [Abstract]
Required reserve balances in cash or on deposits with the Federal Reserve Bank		$ 713,000	$ 749,000
Federal Deposit Insurance Corporation limit on deposit insurance for interest bearing deposit accounts				250,000
Federal Deposit Insurance Corporation limit on deposit insurance for deposit accounts	250,000
Cash on deposit with the FRB and FHLB of Indianapolis which is not insured by the FDIC		$ 113,900,000	$ 58,800,000

The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element.

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