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Borrowings Under Credit Facilities and Promissory Note Payable (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Borrowings under credit facilities and promissory note    
Carrying Value $ 316,962 $ 326,610
Promissory note payable 6,773 7,378
Borrowings under credit facilities and promissory note payable    
Borrowings under credit facilities and promissory note    
Pledged Assets Carrying Value 369,720 378,416
Carrying Value 323,735 333,988
JPMorgan | Commercial | Borrowings under credit facilities and promissory note payable    
Borrowings under credit facilities and promissory note    
Maximum Facility Size 250,000  
Pledged Assets Carrying Value 190,837 226,253
Carrying Value $ 151,525 190,066
JPMorgan | Commercial | Borrowings under credit facilities and promissory note payable | Minimum | LIBOR    
Borrowings under credit facilities and promissory note    
Pricing (as a percent) 3.25%  
JPMorgan | Commercial | Borrowings under credit facilities and promissory note payable | Maximum | LIBOR    
Borrowings under credit facilities and promissory note    
Pricing (as a percent) 3.50%  
Keybank | Commercial | Borrowings under credit facilities and promissory note payable    
Borrowings under credit facilities and promissory note    
Maximum Facility Size $ 100,000  
Pledged Assets Carrying Value 54,231 17,311
Carrying Value $ 53,469 17,162
Keybank | Commercial | Borrowings under credit facilities and promissory note payable | LIBOR    
Borrowings under credit facilities and promissory note    
Pricing (as a percent) 1.75%  
FCB | Commercial | Borrowings under credit facilities and promissory note payable    
Borrowings under credit facilities and promissory note    
Pricing (as a percent) 2.75%  
Maximum Facility Size $ 9,164  
Pledged Assets Carrying Value 8,358 9,144
Carrying Value 6,773 7,378
Comerica | Residential | Borrowings under credit facilities and promissory note payable    
Borrowings under credit facilities and promissory note    
Maximum Facility Size 150,000  
Pledged Assets Carrying Value 71,725 35,102
Carrying Value $ 69,037 33,575
Comerica | Residential | Borrowings under credit facilities and promissory note payable | LIBOR    
Borrowings under credit facilities and promissory note    
Pricing (as a percent) 2.125%  
UBS | Residential | Borrowings under credit facilities and promissory note payable    
Borrowings under credit facilities and promissory note    
Maximum Facility Size $ 65,000  
Pledged Assets Carrying Value   43,121
Carrying Value   39,750
UBS | Residential | Borrowings under credit facilities and promissory note payable | LIBOR    
Borrowings under credit facilities and promissory note    
Pricing (as a percent) 2.30%  
Associated Bank | Residential | Borrowings under credit facilities and promissory note payable    
Borrowings under credit facilities and promissory note    
Maximum Facility Size $ 40,000  
Pledged Assets Carrying Value 19,870 28,575
Carrying Value $ 18,789 27,869
Associated Bank | Residential | Borrowings under credit facilities and promissory note payable | LIBOR    
Borrowings under credit facilities and promissory note    
Pricing (as a percent) 2.25%  
Origin Bank | Residential | Borrowings under credit facilities and promissory note payable    
Borrowings under credit facilities and promissory note    
Maximum Facility Size $ 40,000  
Pledged Assets Carrying Value 24,699 18,910
Carrying Value $ 24,142 $ 18,188
Origin Bank | Residential | Borrowings under credit facilities and promissory note payable | LIBOR    
Borrowings under credit facilities and promissory note    
Pricing (as a percent) 2.25%