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Basis of Presentation and Significant Accounting Policies (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Significant Accounting Policies        
Acquisition costs   $ 10,261,902 $ 3,133,681  
Selling and administrative   17,586,871 9,392,136 $ 9,600,139
Reclassification adjustments        
Significant Accounting Policies        
Acquisition costs     3,100,000  
Selling and administrative     $ (3,100,000)  
MSRs        
Significant Accounting Policies        
Reduction in net income due to increase in amortization   $ 3,400,000    
Reduction in diluted earnings per share due to increase in amortization expense   $ 0.07    
MSRs | Forecast        
Significant Accounting Policies        
Reduction in net income due to increase in amortization $ 1,400,000