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Capitalized Mortgage Servicing Rights (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Capitalized Mortgage Servicing Rights          
Balance at beginning of period     $ 227,742,986    
Balance at end of period $ 247,875,659   247,875,659   $ 227,742,986
Valuation allowance 0   0   0
MSRs          
Capitalized Mortgage Servicing Rights          
Balance at beginning of period 243,083,459   227,742,986    
Additions 20,719,529   66,273,164 $ 233,552,815  
Amortization (11,711,378)   (35,427,217) (7,586,524)  
Write-offs (4,215,951)   (10,713,274) (1,669,081)  
Balance at end of period 247,875,659 $ 224,297,210 247,875,659 224,297,210 $ 227,742,986
Prepayment fees 3,800,000 1,500,000 7,900,000 1,500,000  
Expected amortization of capitalized MSR balances          
2017 (three months ended 12/31/2017) 11,925,780   11,925,780    
2018 45,577,306   45,577,306    
2019 41,680,988   41,680,988    
2020 35,461,494   35,461,494    
2021 28,170,144   28,170,144    
2022 22,176,139   22,176,139    
Thereafter 62,883,808   62,883,808    
Total 247,875,659   $ 247,875,659    
MSRs | Minimum          
Capitalized Mortgage Servicing Rights          
Percentage of MSRs discount rate     8.00%    
MSRs | Maximum          
Capitalized Mortgage Servicing Rights          
Percentage of MSRs discount rate     15.00%    
MSRs | Weighted average          
Capitalized Mortgage Servicing Rights          
Percentage of MSRs discount rate     13.00%    
Estimated life remaining     7 years 1 month 6 days   6 years 10 months 24 days
Acquired MSRs          
Capitalized Mortgage Servicing Rights          
Balance at beginning of period 168,189,300   $ 194,800,754    
Additions       221,647,421  
Amortization (8,952,573)   (29,074,057) (7,358,639)  
Write-offs (4,193,665)   (10,683,635) (1,669,081)  
Balance at end of period 155,043,062 212,619,701 155,043,062 212,619,701 $ 194,800,754
Originated MSRs          
Capitalized Mortgage Servicing Rights          
Balance at beginning of period 74,894,159   32,942,232    
Additions 20,719,529   66,273,164 11,905,394  
Amortization (2,758,805)   (6,353,160) (227,885)  
Write-offs (22,286)   (29,639)    
Balance at end of period $ 92,832,597 $ 11,677,509 $ 92,832,597 $ 11,677,509 $ 32,942,232