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Financing and Other Debt - Amounts Outstanding Under Participation Debt Agreements (Details) - USD ($)
Jun. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Amounts Available $ 719,526,000 $ 666,486,000
Loan Participations and Assignments    
Debt Instrument [Line Items]    
Amounts Available 180,000,000 180,000,000
Amounts Outstanding 57,499,000 114,849,000
Remaining Funding Capacity $ 122,501,000 $ 65,151,000
Average interest rate 4.67% 4.30%
Short-term Debt | Loan Participations and Assignments    
Debt Instrument [Line Items]    
Amounts Available $ 130,000,000 $ 130,000,000
Amounts Outstanding 7,499,000 64,849,000
Remaining Funding Capacity 122,501,000 65,151,000
Long-term Debt | Loan Participations and Assignments    
Debt Instrument [Line Items]    
Amounts Available 50,000,000 50,000,000
Amounts Outstanding $ 50,000,000 $ 50,000,000