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Guarantees (Details) - USD ($)
1 Months Ended
May. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Residential mortgage operation      
Guarantee Obligations [Line Items]      
Equity method investment, ownership percentage   50.00%  
Company guarantee of full and prompt payment      
Guarantee Obligations [Line Items]      
Term of line-of-credit agreement 13 months    
Maximum total amount of advances requested and unpaid principle balance $ 15,000,000    
Outstanding balance of line of credit   $ 5,222,000 $ 4,548,000
Company guarantee of full and prompt payment | Residential mortgage operation      
Guarantee Obligations [Line Items]      
Equity method investment, ownership percentage 50.00%