Commitments and Contingent Liabilities (Detail Textuals) - USD ($)	9 Months Ended
	Sep. 30, 2015	May. 31, 2015
Loans of middle market private equity sponsored companies
Contingent Liabilities [Line Items]
Commitment to investment in limited partnership	$ 5,000,000
Funding for investment in limited partnership	625,000
Remaining commitment	4,400,000
Collateralized loan obligations (CLO)s
Contingent Liabilities [Line Items]
Commitment to investment in limited partnership		$ 15,000,000
Funding for investment in limited partnership	10,200,000
Remaining commitment	$ 4,800,000
JRG Reinsurance Company, Ltd.
Contingent Liabilities [Line Items]
Number of letter of credit facilities	2
Total amount deposited in trust accounts	$ 216,700,000
JRG Reinsurance Company, Ltd. | Letter of credit 100 Million
Contingent Liabilities [Line Items]
Letters of credit facility, amount	100,000,000
Amount of letters of credit issued	95,200,000
Assets deposited for securing letters of credit	113,400,000
JRG Reinsurance Company, Ltd. | Letter of credit 102.5 Million
Contingent Liabilities [Line Items]
Letters of credit facility, amount	102,500,000
Amount of letters of credit issued	43,500,000
Assets deposited for securing letters of credit	$ 61,800,000