Cash and Cash Equivalents (Details Textual) $ in Millions	Dec. 31, 2016 USD ($)
Cash and Cash Equivalents [Line Items]
Cash on deposit	$ 0.6
Federal Home Loan Bank of Indianapolis
Cash and Cash Equivalents [Line Items]
Cash held	0.6
Federal Home Loan Bank of Chicago
Cash and Cash Equivalents [Line Items]
Cash held	$ 36.6

Cash deposited in a special reserve account for the exclusive benefit of customers pursuant to SEC Regulations.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 305
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6478312&loc=d3e61473-112792

Name:	us-gaap_CashReserveDepositRequiredAndMade
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant