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Fair Value (Details 3) - Recurring basis - Level 3
6 Months Ended
Jun. 30, 2015
USD ($)
Available-for-sale Securities  
Financial assets  
Balance at the beginning of the period $ 2,000,000
Adjustment to fair value:  
Changes in fair value 100,000
Commercial mortgage-backed security (CMBS)  
Adjustment to fair value:  
Payoff $ (2,100,000)