XML 76 R61.htm IDEA: XBRL DOCUMENT
v3.22.4

Securities - Gross Unrealized Losses and Fair Value by Investment Category (Details) $ in Thousands | Dec. 31, 2022 USD ($) security | Dec. 31, 2021 USD ($) security
--- | --- | ---
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 247 | 121
Fair Value, Less than 12 Months | $ 726,431 | $ 1,899,384
Unrealized Losses, Less than 12 Months | $ (41,924) | $ (30,120)
Number of positions, 12 Months or More | security | 98 | 7
Fair Value, 12 Months or More | $ 788,657 | $ 25,634
Unrealized Losses, 12 Months or More | $ (159,375) | $ (904)
Number of positions | security | 345 | 128
Fair Value | $ 1,515,088 | $ 1,925,018
Unrealized Losses | $ (201,299) | $ (31,024)
Held to Maturity: |  |
Number of positions, Less than 12 Months | security | 122 | 90
Fair Value, Less than 12 Months | $ 448,575 | $ 201,791
Unrealized Losses, Less than 12 Months | $ (51,435) | $ (1,154)
Number of positions, 12 Months or More | security | 115 | 1
Fair Value, 12 Months or More | $ 755,527 | $ 5,354
Unrealized Losses, 12 Months or More | $ (66,112) | $ (17)
Number of positions | security | 237 | 91
Fair Value | $ 1,204,102 | $ 207,145
Unrealized Losses | $ (117,547) | $ (1,171)
Obligations of other U.S. Government agencies and corporations |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 5 |
Fair Value, Less than 12 Months | $ 164,660 |
Unrealized Losses, Less than 12 Months | $ (5,340) |
Number of positions, 12 Months or More | security | 0 |
Fair Value, 12 Months or More | $ 0 |
Unrealized Losses, 12 Months or More | $ 0 |
Number of positions | security | 5 |
Fair Value | $ 164,660 |
Unrealized Losses | $ (5,340) |
Obligations of states and political subdivisions |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 84 | 8
Fair Value, Less than 12 Months | $ 96,939 | $ 34,303
Unrealized Losses, Less than 12 Months | $ (4,869) | $ (216)
Number of positions, 12 Months or More | security | 11 | 3
Fair Value, 12 Months or More | $ 33,038 | $ 3,892
Unrealized Losses, 12 Months or More | $ (4,499) | $ (53)
Number of positions | security | 95 | 11
Fair Value | $ 129,977 | $ 38,195
Unrealized Losses | $ (9,368) | $ (269)
Held to Maturity: |  |
Number of positions, Less than 12 Months | security | 105 | 24
Fair Value, Less than 12 Months | $ 191,442 | $ 62,131
Unrealized Losses, Less than 12 Months | $ (35,870) | $ (685)
Number of positions, 12 Months or More | security | 24 | 0
Fair Value, 12 Months or More | $ 49,697 | $ 0
Unrealized Losses, 12 Months or More | $ (12,454) | $ 0
Number of positions | security | 129 | 24
Fair Value | $ 241,139 | $ 62,131
Unrealized Losses | $ (48,324) | $ (685)
Other debt securities |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 25 | 1
Fair Value, Less than 12 Months | $ 63,423 | $ 8,699
Unrealized Losses, Less than 12 Months | $ (3,167) | $ (148)
Number of positions, 12 Months or More | security | 1 | 0
Fair Value, 12 Months or More | $ 7,412 | $ 0
Unrealized Losses, 12 Months or More | $ (883) | $ 0
Number of positions | security | 26 | 1
Fair Value | $ 70,835 | $ 8,699
Unrealized Losses | $ (4,050) | $ (148)
Held to Maturity: |  |
Number of positions, Less than 12 Months | security | 2 | 8
Fair Value, Less than 12 Months | $ 42,567 | $ 21,972
Unrealized Losses, Less than 12 Months | $ (2,013) | $ (79)
Number of positions, 12 Months or More | security | 8 | 0
Fair Value, 12 Months or More | $ 16,042 | $ 0
Unrealized Losses, 12 Months or More | $ (2,253) | $ 0
Number of positions | security | 10 | 8
Fair Value | $ 58,609 | $ 21,972
Unrealized Losses | $ (4,266) | $ (79)
Government agency mortgage backed securities | Residential mortgage backed securities: |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 97 | 41
Fair Value, Less than 12 Months | $ 214,516 | $ 727,546
Unrealized Losses, Less than 12 Months | $ (15,115) | $ (6,312)
Number of positions, 12 Months or More | security | 29 | 1
Fair Value, 12 Months or More | $ 237,970 | $ 12,305
Unrealized Losses, 12 Months or More | $ (36,921) | $ (504)
Number of positions | security | 126 | 42
Fair Value | $ 452,486 | $ 739,851
Unrealized Losses | $ (52,036) | $ (6,816)
Held to Maturity: |  |
Number of positions, Less than 12 Months | security | 8 | 50
Fair Value, Less than 12 Months | $ 94,258 | $ 53,560
Unrealized Losses, Less than 12 Months | $ (4,186) | $ (181)
Number of positions, 12 Months or More | security | 62 | 1
Fair Value, 12 Months or More | $ 364,870 | $ 5,354
Unrealized Losses, 12 Months or More | $ (20,246) | $ (17)
Number of positions | security | 70 | 51
Fair Value | $ 459,128 | $ 58,914
Unrealized Losses | $ (24,432) | $ (198)
Government agency mortgage backed securities | Commercial mortgage backed securities: |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 4 | 1
Fair Value, Less than 12 Months | $ 10,114 | $ 1,791
Unrealized Losses, Less than 12 Months | $ (1,053) | $ (1)
Number of positions, 12 Months or More | security | 0 | 1
Fair Value, 12 Months or More | $ 0 | $ 432
Unrealized Losses, 12 Months or More | $ 0 | $ 0
Number of positions | security | 4 | 2
Fair Value | $ 10,114 | $ 2,223
Unrealized Losses | $ (1,053) | $ (1)
Held to Maturity: |  |
Number of positions, Less than 12 Months | security | 1 |
Fair Value, Less than 12 Months | $ 13,745 |
Unrealized Losses, Less than 12 Months | $ (3,261) |
Number of positions, 12 Months or More | security | 0 |
Fair Value, 12 Months or More | $ 0 |
Unrealized Losses, 12 Months or More | $ 0 |
Number of positions | security | 1 |
Fair Value | $ 13,745 |
Unrealized Losses | $ (3,261) |
Government agency collateralized mortgage obligations | Residential mortgage backed securities: |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 16 | 49
Fair Value, Less than 12 Months | $ 109,753 | $ 966,126
Unrealized Losses, Less than 12 Months | $ (8,552) | $ (20,371)
Number of positions, 12 Months or More | security | 36 | 0
Fair Value, 12 Months or More | $ 391,416 | $ 0
Unrealized Losses, 12 Months or More | $ (95,312) | $ 0
Number of positions | security | 52 | 49
Fair Value | $ 501,169 | $ 966,126
Unrealized Losses | $ (103,864) | $ (20,371)
Held to Maturity: |  |
Number of positions, Less than 12 Months | security | 4 | 1
Fair Value, Less than 12 Months | $ 98,912 | $ 24,740
Unrealized Losses, Less than 12 Months | $ (5,479) | $ (92)
Number of positions, 12 Months or More | security | 14 | 0
Fair Value, 12 Months or More | $ 293,698 | $ 0
Unrealized Losses, 12 Months or More | $ (25,227) | $ 0
Number of positions | security | 18 | 1
Fair Value | $ 392,610 | $ 24,740
Unrealized Losses | $ (30,706) | $ (92)
Government agency collateralized mortgage obligations | Commercial mortgage backed securities: |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 16 | 21
Fair Value, Less than 12 Months | $ 67,026 | $ 160,919
Unrealized Losses, Less than 12 Months | $ (3,828) | $ (3,072)
Number of positions, 12 Months or More | security | 21 | 2
Fair Value, 12 Months or More | $ 118,821 | $ 9,005
Unrealized Losses, 12 Months or More | $ (21,760) | $ (347)
Number of positions | security | 37 | 23
Fair Value | $ 185,847 | $ 169,924
Unrealized Losses | $ (25,588) | $ (3,419)
Held to Maturity: |  |
Number of positions, Less than 12 Months | security | 2 | 7
Fair Value, Less than 12 Months | $ 7,651 | $ 39,388
Unrealized Losses, Less than 12 Months | $ (626) | $ (117)
Number of positions, 12 Months or More | security | 7 | 0
Fair Value, 12 Months or More | $ 31,220 | $ 0
Unrealized Losses, 12 Months or More | $ (5,932) | $ 0
Number of positions | security | 9 | 7
Fair Value | $ 38,871 | $ 39,388
Unrealized Losses | $ (6,558) | $ (117)

X
- Definition Debt Securities, Held for maturity, Continuous Unrealized Loss Position, 12 Months Or More, Number Of Positions + References No definition available. + Details
Name: | rnst_DebtSecuritiesHeldForMaturityContinuousUnrealizedLossPosition12MonthsOrMoreNumberOfPositions
Namespace Prefix: | rnst_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Debt Securities, Held for maturity, Continuous Unrealized Loss Position, Less than 12 Months, Number Of Positions + References No definition available. + Details
Name: | rnst_DebtSecuritiesHeldForMaturityContinuousUnrealizedLossPositionLessThan12MonthsNumberOfPositions
Namespace Prefix: | rnst_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Debt Securities, Held for maturity, Unrealized Loss Position, Number Of Positions + References No definition available. + Details
Name: | rnst_DebtSecuritiesHeldForMaturityUnrealizedLossPositionNumberOfPositions
Namespace Prefix: | rnst_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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

X
- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI https://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without an allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922888-210455 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI https://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27337-111563 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without an allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922888-210455 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsNumberOfPositions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position without allowance for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922888-210455 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI https://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(2) -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922888-210455 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b)(3) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922888-210455 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity), in continuous loss position for 12 months or longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27337-111563 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27290-111563 + Details
Name: | us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity), in unrealized loss position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27290-111563 + Details
Name: | us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionAccumulatedLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Definition Fair value of investment in debt security measured at amortized cost (held-to-maturity), in unrealized loss position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27290-111563 + Details
Name: | us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity), in continuous loss position for less than 12 months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27290-111563 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27337-111563 + Details
Name: | us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value of investment in debt security measured at amortized cost (held-to-maturity), in continuous unrealized loss position for less than 12 months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27337-111563 + Details
Name: | us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value of investment in debt security measured at amortized cost (held-to-maturity), in continuous unrealized loss position for 12 months or longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27337-111563 + Details
Name: | us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_USGovernmentCorporationsAndAgenciesSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_USStatesAndPoliticalSubdivisionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_OtherDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=rnst_GovernmentAgencyMortgageBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_ResidentialMortgageBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CommercialMortgageBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=rnst_GovernmentAgencyCollateralizedMortgageObligationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |