XML 56 R44.htm IDEA: XBRL DOCUMENT
v3.24.1.u1

Securities - Schedule of Held-to-maturity, Unrealized Loss on Investments (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Held-to-maturity: |  |
12 Months or Greater, Fair Value | $ 161,211 | $ 262,536
12 Months or Greater, Gross Unrealized Losses | $ (18,956) | $ (18,698)
12 Months or Greater, Number of Securities | 55 | 57
Total, Fair Value | $ 161,211 | $ 262,536
Total, Gross Unrealized Losses | $ (18,956) | $ (18,698)
Total, Number of Securities | 55 | 57
US Treasury Securities [Member] |  |
Held-to-maturity: |  |
12 Months or Greater, Fair Value | $ 49,802 | $ 148,584
12 Months or Greater, Gross Unrealized Losses | $ (227) | $ (1,482)
12 Months or Greater, Number of Securities | 2 | 4
Total, Fair Value | $ 49,802 | $ 148,584
Total, Gross Unrealized Losses | $ (227) | $ (1,482)
Total, Number of Securities | 2 | 4
US Government-sponsored Enterprises Debt Securities [Member] |  |
Held-to-maturity: |  |
12 Months or Greater, Fair Value | $ 41,135 | $ 42,194
12 Months or Greater, Gross Unrealized Losses | $ (7,897) | $ (7,143)
12 Months or Greater, Number of Securities | 13 | 13
Total, Fair Value | $ 41,135 | $ 42,194
Total, Gross Unrealized Losses | $ (7,897) | $ (7,143)
Total, Number of Securities | 13 | 13
Municipal securities [Member] |  |
Held-to-maturity: |  |
12 Months or Greater, Fair Value | $ 45,840 | $ 46,500
12 Months or Greater, Gross Unrealized Losses | $ (6,582) | $ (6,178)
12 Months or Greater, Number of Securities | 35 | 35
Total, Fair Value | $ 45,840 | $ 46,500
Total, Gross Unrealized Losses | $ (6,582) | $ (6,178)
Total, Number of Securities | 35 | 35
Mortgage-backed securities (GSEs) [Member] |  |
Held-to-maturity: |  |
12 Months or Greater, Fair Value | $ 24,434 | $ 25,258
12 Months or Greater, Gross Unrealized Losses | $ (4,250) | $ (3,895)
12 Months or Greater, Number of Securities | 5 | 5
Total, Fair Value | $ 24,434 | $ 25,258
Total, Gross Unrealized Losses | $ (4,250) | $ (3,895)
Total, Number of Securities | 5 | 5

X
- Definition Number of investments in debt securities held to maturity, in unrealized loss position, for 12 months or longer, without allowance for credit loss. + References No definition available. + Details
Name: | smbk_DebtSecuritiesHeldToMaturityUnrealizedLossPosition12MonthsOrLongerNumberOfPositions
Namespace Prefix: | smbk_
Data Type: | xbrli:decimalItemType
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 No definition available. + Details
Name: | smbk_HeldToMaturityDebtSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
Namespace Prefix: | smbk_
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 No definition available. + Details
Name: | smbk_HeldToMaturityDebtSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerFairValue
Namespace Prefix: | smbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Held-to-Maturity, Debt Securities, Continuous Unrealized Loss Position [Abstract] + References No definition available. + Details
Name: | smbk_HeldToMaturityDebtSecuritiesContinuousUnrealizedLossPositionAbstract
Namespace Prefix: | smbk_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Disclosure regarding factors used to determine that the impairment of securities categorized as held-to-maturity where cost exceeds fair value is not an other than temporary impairment (OTTI). This item contains disclosure of the number of investment positions in the held-to-maturity investments determined to be temporarily impaired. + References No definition available. + Details
Name: | smbk_HeldToMaturityDebtSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions
Namespace Prefix: | smbk_
Data Type: | xbrli:decimalItemType
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 unrealized loss position. + References No definition available. + Details
Name: | smbk_HeldToMaturityDebtSecuritiesUnrealizedLossPositionAccumulatedLoss
Namespace Prefix: | smbk_
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 unrealized loss position. + References No definition available. + Details
Name: | smbk_HeldToMaturityDebtSecuritiesUnrealizedLossPositionFairValue
Namespace Prefix: | smbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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