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Mortgage Servicing Rights (Tables) | 3 Months Ended
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Mar. 31, 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 | 2,098 |
Amortization | (1,221 | )
Balance at March 31, 2018 | $ | 40,216 |
Data and key economic assumptions related to the Company's MSRs | Data and key economic assumptions related to the Company’s MSRs as of March 31, 2018 and December 31, 2017 are as follows:
| March 31, 2018 |  | December 31, 2017
Unpaid principal balance | $ | 4,089,045 |  |  | $ | 4,012,519 |
Weighted-average prepayment speed (CPR) | 7.42 | % |  | 8.04 | %
Estimated impact of a 10% increase | $ | (1,692 | ) |  | $ | (1,592 | )
Estimated impact of a 20% increase | (3,280 | ) |  | (3,095 | )
Discount rate | 9.40 | % |  | 9.69 | %
Estimated impact of a 10% increase | $ | (2,374 | ) |  | $ | (2,027 | )
Estimated impact of a 20% increase | (4,556 | ) |  | (3,896 | )
Weighted-average coupon interest rate | 3.89 | % |  | 3.89 | %
Weighted-average servicing fee (basis points) | 26.54 |  |  | 26.36 |
Weighted-average remaining maturity (in years) | 8.27 |  |  | 7.98 |

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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://www.xbrl.org/2003/role/presentationRef -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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