Financing Receivables - Additional Information (Details) (USD $)
3 Months Ended
Mar. 31, 2015
agent_receivable
MortgageLoan
Dec. 31, 2014
MortgageLoan
Dec. 31, 2013
Agent receivables, net      
Financing Receivable, Recorded Investment [Line Items]      
Financing Receivable, Gross $ 3,400,000 $ 3,700,000  
Allowance 1,719,000 2,003,000 2,245,000
Agent specific loans      
Financing Receivable, Recorded Investment [Line Items]      
Financing Receivable, Gross 1,000,000 1,000,000  
Allowance 300,000 300,000  
Other Agent Receivables      
Financing Receivable, Recorded Investment [Line Items]      
Financing Receivable, Gross 2,400,000 2,700,000  
Allowance 1,400,000 1,700,000  
Mortgage loans, net      
Financing Receivable, Recorded Investment [Line Items]      
Allowance $ 1,923,000 $ 1,914,000 $ 3,251,000
Number of Types of Agent Receivables 2    
Number Of Financing Receivables Past Due 3 0  
Number of Financing Receivables Thirty Or More Days Past Due Subsequent Payment Received 3