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Fair Value (Details 1) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Fair Value, Inputs, Level 3 [Member] | Servicing Asset [Member]    
Change in fair value $ 306,000 $ 313,000
Balance at end of year $ 306,000 $ 313,000
Fair Value, Inputs, Level 3 [Member] | Servicing Asset [Member] | Miniimum [Member]    
Constant repayment rate 5.66% 4.94%
Discount rate 9.70% 11.38%
Weighted average life 1 year 10 months 6 days 2 years 14 days
Fair Value, Inputs, Level 3 [Member] | Servicing Asset [Member] | Maxiimum [Member]    
Constant repayment rate 17.78% 15.92%
Discount rate 21.23% 19.61%
Weighted average life 6 years 4 months 20 days 6 years 9 months 7 days
Loans Held At Fair Value [Member]    
Change in fair value $ 5,394,000 $ 5,420,000
Balance at end of year $ 5,394,000 $ 5,420,000
Loans Held At Fair Value [Member] | Miniimum [Member]    
Constant repayment rate 0.00% 0.00%
Discount rate 8.70% 5.49%
Weighted average life 1 year 10 months 6 days 2 years 14 days
Project default rate 1.14% 1.07%
Loans Held At Fair Value [Member] | Maxiimum [Member]    
Constant repayment rate 18.10% 16.50%
Discount rate 12.49% 9.76%
Weighted average life 6 years 6 months 6 years 1 month 2 days
Project default rate 11.16% 10.12%