XML 86 R64.htm IDEA: XBRL DOCUMENT
v3.24.0.1

Securities - Gross Unrealized Losses and Fair Value by Investment Category (Details) $ in Thousands | Dec. 31, 2023 USD ($) security | Dec. 31, 2022 USD ($) security
--- | --- | ---
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 6 | 247
Fair Value, Less than 12 Months | $ 6,819 | $ 726,431
Unrealized Losses, Less than 12 Months | $ (222) | $ (41,924)
Number of positions, 12 Months or More | security | 127 | 98
Fair Value, 12 Months or More | $ 685,774 | $ 788,657
Unrealized Losses, 12 Months or More | $ (139,572) | $ (159,375)
Number of positions | security | 133 | 345
Fair Value | $ 692,593 | $ 1,515,088
Unrealized Losses | $ (139,794) | $ (201,299)
Held to Maturity: |  |
Number of positions, Less than 12 Months | security | 2 | 122
Fair Value, Less than 12 Months | $ 2,807 | $ 448,575
Unrealized Losses, Less than 12 Months | $ (25) | $ (51,435)
Number of positions, 12 Months or More | security | 234 | 115
Fair Value, 12 Months or More | $ 1,117,285 | $ 755,527
Unrealized Losses, 12 Months or More | $ (99,715) | $ (66,112)
Number of positions | security | 236 | 237
Fair Value | $ 1,120,092 | $ 1,204,102
Unrealized Losses | $ (99,740) | $ (117,547)
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 | 3 | 84
Fair Value, Less than 12 Months | $ 2,914 | $ 96,939
Unrealized Losses, Less than 12 Months | $ (2) | $ (4,869)
Number of positions, 12 Months or More | security | 9 | 11
Fair Value, 12 Months or More | $ 15,198 | $ 33,038
Unrealized Losses, 12 Months or More | $ (1,881) | $ (4,499)
Number of positions | security | 12 | 95
Fair Value | $ 18,112 | $ 129,977
Unrealized Losses | $ (1,883) | $ (9,368)
Held to Maturity: |  |
Number of positions, Less than 12 Months | security | 2 | 105
Fair Value, Less than 12 Months | $ 2,807 | $ 191,442
Unrealized Losses, Less than 12 Months | $ (25) | $ (35,870)
Number of positions, 12 Months or More | security | 126 | 24
Fair Value, 12 Months or More | $ 249,995 | $ 49,697
Unrealized Losses, 12 Months or More | $ (33,663) | $ (12,454)
Number of positions | security | 128 | 129
Fair Value | $ 252,802 | $ 241,139
Unrealized Losses | $ (33,688) | $ (48,324)
Other debt securities |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 2 | 25
Fair Value, Less than 12 Months | $ 3,099 | $ 63,423
Unrealized Losses, Less than 12 Months | $ (195) | $ (3,167)
Number of positions, 12 Months or More | security | 19 | 1
Fair Value, 12 Months or More | $ 35,072 | $ 7,412
Unrealized Losses, 12 Months or More | $ (4,263) | $ (883)
Number of positions | security | 21 | 26
Fair Value | $ 38,171 | $ 70,835
Unrealized Losses | $ (4,458) | $ (4,050)
Held to Maturity: |  |
Number of positions, Less than 12 Months | security | 0 | 2
Fair Value, Less than 12 Months | $ 0 | $ 42,567
Unrealized Losses, Less than 12 Months | $ 0 | $ (2,013)
Number of positions, 12 Months or More | security | 10 | 8
Fair Value, 12 Months or More | $ 54,254 | $ 16,042
Unrealized Losses, 12 Months or More | $ (4,119) | $ (2,253)
Number of positions | security | 10 | 10
Fair Value | $ 54,254 | $ 58,609
Unrealized Losses | $ (4,119) | $ (4,266)
Government agency mortgage-backed securities | Residential mortgage-backed securities |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 1 | 97
Fair Value, Less than 12 Months | $ 806 | $ 214,516
Unrealized Losses, Less than 12 Months | $ (25) | $ (15,115)
Number of positions, 12 Months or More | security | 35 | 29
Fair Value, 12 Months or More | $ 166,963 | $ 237,970
Unrealized Losses, 12 Months or More | $ (24,943) | $ (36,921)
Number of positions | security | 36 | 126
Fair Value | $ 167,769 | $ 452,486
Unrealized Losses | $ (24,968) | $ (52,036)
Held to Maturity: |  |
Number of positions, Less than 12 Months | security | 0 | 8
Fair Value, Less than 12 Months | $ 0 | $ 94,258
Unrealized Losses, Less than 12 Months | $ 0 | $ (4,186)
Number of positions, 12 Months or More | security | 70 | 62
Fair Value, 12 Months or More | $ 405,950 | $ 364,870
Unrealized Losses, 12 Months or More | $ (20,314) | $ (20,246)
Number of positions | security | 70 | 70
Fair Value | $ 405,950 | $ 459,128
Unrealized Losses | $ (20,314) | $ (24,432)
Government agency mortgage-backed securities | Commercial mortgage-backed securities |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 0 | 4
Fair Value, Less than 12 Months | $ 0 | $ 10,114
Unrealized Losses, Less than 12 Months | $ 0 | $ (1,053)
Number of positions, 12 Months or More | security | 2 | 0
Fair Value, 12 Months or More | $ 5,392 | $ 0
Unrealized Losses, 12 Months or More | $ (637) | $ 0
Number of positions | security | 2 | 4
Fair Value | $ 5,392 | $ 10,114
Unrealized Losses | $ (637) | $ (1,053)
Held to Maturity: |  |
Number of positions, Less than 12 Months | security | 0 | 1
Fair Value, Less than 12 Months | $ 0 | $ 13,745
Unrealized Losses, Less than 12 Months | $ 0 | $ (3,261)
Number of positions, 12 Months or More | security | 1 | 0
Fair Value, 12 Months or More | $ 14,011 | $ 0
Unrealized Losses, 12 Months or More | $ (2,972) | $ 0
Number of positions | security | 1 | 1
Fair Value | $ 14,011 | $ 13,745
Unrealized Losses | $ (2,972) | $ (3,261)
Government agency collateralized mortgage obligations | Residential mortgage-backed securities |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 0 | 16
Fair Value, Less than 12 Months | $ 0 | $ 109,753
Unrealized Losses, Less than 12 Months | $ 0 | $ (8,552)
Number of positions, 12 Months or More | security | 37 | 36
Fair Value, 12 Months or More | $ 354,574 | $ 391,416
Unrealized Losses, 12 Months or More | $ (85,883) | $ (95,312)
Number of positions | security | 37 | 52
Fair Value | $ 354,574 | $ 501,169
Unrealized Losses | $ (85,883) | $ (103,864)
Held to Maturity: |  |
Number of positions, Less than 12 Months | security | 0 | 4
Fair Value, Less than 12 Months | $ 0 | $ 98,912
Unrealized Losses, Less than 12 Months | $ 0 | $ (5,479)
Number of positions, 12 Months or More | security | 18 | 14
Fair Value, 12 Months or More | $ 355,538 | $ 293,698
Unrealized Losses, 12 Months or More | $ (31,670) | $ (25,227)
Number of positions | security | 18 | 18
Fair Value | $ 355,538 | $ 392,610
Unrealized Losses | $ (31,670) | $ (30,706)
Government agency collateralized mortgage obligations | Commercial mortgage-backed securities |  |
Available for Sale: |  |
Number of positions, Less than 12 Months | security | 0 | 16
Fair Value, Less than 12 Months | $ 0 | $ 67,026
Unrealized Losses, Less than 12 Months | $ 0 | $ (3,828)
Number of positions, 12 Months or More | security | 25 | 21
Fair Value, 12 Months or More | $ 108,575 | $ 118,821
Unrealized Losses, 12 Months or More | $ (21,965) | $ (21,760)
Number of positions | security | 25 | 37
Fair Value | $ 108,575 | $ 185,847
Unrealized Losses | $ (21,965) | $ (25,588)
Held to Maturity: |  |
Number of positions, Less than 12 Months | security | 0 | 2
Fair Value, Less than 12 Months | $ 0 | $ 7,651
Unrealized Losses, Less than 12 Months | $ 0 | $ (626)
Number of positions, 12 Months or More | security | 9 | 7
Fair Value, 12 Months or More | $ 37,537 | $ 31,220
Unrealized Losses, 12 Months or More | $ (6,977) | $ (5,932)
Number of positions | security | 9 | 9
Fair Value | $ 37,537 | $ 38,871
Unrealized Losses | $ (6,977) | $ (6,558)

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/exampleRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479081/326-30-55-8 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-7 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-5 + 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://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-7 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-5 + 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 -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-4 + 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/exampleRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479081/326-30-55-8 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-7 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-5 + 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://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-7 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-5 + 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 -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-4 + 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/exampleRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479081/326-30-55-8 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-6 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-4 + 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://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-6 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-4 + 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://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (b)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-6 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-4 + 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/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-7 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-6 + 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/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-6 + 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/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-6 + 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/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-7 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-6 + 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/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-7 + 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/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-7 + 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: |