XML 66 R45.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Mortgage Servicing Rights (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2017
Transfers and Servicing [Abstract] |
Changes in the Company's mortgage servicing rights | Changes in the Company’s mortgage servicing rights (“MSRs”) were as follows, for the periods presented:
Carrying Value at January 1, 2016 | $ | 29,642 |
Sale of MSRs | (18,477 | )
Capitalization | 18,061 |
Amortization | (2,884 | )
Impairment | (40 | )
Carrying Value at December 31, 2016 | $ | 26,302 |
Capitalization | 16,973 |
Amortization | (3,936 | )
Carrying Value at December 31, 2017 | $ | 39,339 |
Data and key economic assumptions related to the Company's mortgage servicing rights | Data and key economic assumptions related to the Company’s mortgage servicing rights as of December 31 are as follows:
| 2017 |  | 2016 |  | 2015
Unpaid principal balance | $ | 4,012,519 |  |  | $ | 2,763,344 |  |  | $ | 3,090,839 |
Weighted-average prepayment speed (CPR) | 8.04 | % |  | 7.34 | % |  | 8.89 | %
Estimated impact of a 10% increase | $ | (1,592 | ) |  | $ | (1,034 | ) |  | $ | (1,203 | )
Estimated impact of a 20% increase | (3,095 | ) |  | (2,010 | ) |  | (2,330 | )
Discount rate | 9.69 | % |  | 9.64 | % |  | 9.51 | %
Estimated impact of a 100bp increase | $ | (2,027 | ) |  | $ | (1,368 | ) |  | $ | (1,357 | )
Estimated impact of a 200bp increase | (3,896 | ) |  | (2,629 | ) |  | (2,612 | )
Weighted-average coupon interest rate | 3.89 | % |  | 3.83 | % |  | 3.97 | %
Weighted-average servicing fee (basis points) | 26.36 |  |  | 25.87 |  |  | 25.04 |
Weighted-average remaining maturity (in years) | 7.98 |  |  | 11.11 |  |  | 15.23 |

X
- Definition Schedule of fair value assumption related to mortgage servicing rights. + References No definition available. + Details
Name: | rnst_ScheduleOfFairValueAssumptionRelatedToMortgageServicingRightsTableTextBlock
Namespace Prefix: | rnst_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_ScheduleOfServicingAssetsAtAmortizedValueTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_TransfersAndServicingAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration