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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

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- Definition Amount of other-than-temporary impairment (OTTI) applied to contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (a)(6) -URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122739-111746 + Details
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