Collateral for Letters of Credit (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013 LOC
Collateral for Letters of Credit (Textual) [Abstract]
Number of outstanding letters of credit	3
Outstanding letters of credit from the Federal Home Loan Bank of Indianapolis	$ 21.1

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

No definition available.

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant