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Securities Loaned - Additional Information (Detail) - USD ($)
Jun. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Securities loaned $ 33,659,000  
CF & Co [Member]    
Debt Instrument [Line Items]    
Securities loaned 33,700,000 $ 0
CF & Co [Member] | Securities Financing Transaction, Fair Value [Member]    
Debt Instrument [Line Items]    
Securities loaned $ 33,700,000  
CF & Co [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Stated interest rate 2.97%  
CF & Co [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Stated interest rate 3.15%