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Mortgage Servicing Rights (Tables) | 9 Months Ended
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Sep. 30, 2018
Transfers and Servicing [Abstract] |
Changes in the Company's MSRs | Changes in the Company’s MSRs were as follows:
Balance at January 1, 2018 | $ | 39,339 |
Capitalization | 10,745 |
Amortization | (3,671 | )
Balance at September 30, 2018 | $ | 46,413 |
Data and key economic assumptions related to the Company's MSRs | Data and key economic assumptions related to the Company’s MSRs are as follows as of the dates presented:
| September 30, 2018 |  | December 31, 2017 |  | September 30, 2017
Unpaid principal balance | $ | 4,533,400 |  |  | $ | 4,012,519 |  |  | $ | 3,703,064 |
Weighted-average prepayment speed (CPR) | 7.46 | % |  | 8.04 | % |  | 8.89 | %
Estimated impact of a 10% increase | $ | (5,872 | ) |  | $ | (1,592 | ) |  | $ | (1,501 | )
Estimated impact of a 20% increase | (3,732 | ) |  | (3,095 | ) |  | (2,910 | )
Discount rate | 9.43 | % |  | 9.69 | % |  | 9.68 | %
Estimated impact of a 10% increase | $ | (2,758 | ) |  | $ | (2,027 | ) |  | $ | (1,711 | )
Estimated impact of a 20% increase | (5,291 | ) |  | (3,896 | ) |  | (3,292 | )
Weighted-average coupon interest rate | 4.00 | % |  | 3.89 | % |  | 3.89 | %
Weighted-average servicing fee (basis points) | 27.02 |  |  | 26.36 |  |  | 26.22 |
Weighted-average remaining maturity (in years) | 8.32 |  | 7.98 |  | 14.94

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- Definition Schedule of fair value assumption related to mortgage servicing rights. + References No definition available. + Details
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- Definition Tabular disclosure of activity in the balance of servicing assets subsequently measured at amortized cost. Includes, but is not limited to, beginning and ending balances, additions, disposals, and amortization. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122739-111746 + Details
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- References No definition available. + Details
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