XML 72 R58.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Loans and Allowance for Loan Losses (Details 6) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with a valuation allowance, Related Allowance | $ 461 |
Total impaired loans, Recorded Investment | 2,657 |
Total impaired loans, Unpaid Principal Balance | 2,826 |
Total impaired loans, Average Recorded Investment | 2,005 |
Total impaired loans, Interest Income Recognized | 129 |
All Other Loans [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans without a valuation allowance, Recorded Investment | 1,427 | $ 1,851
Impaired loans without a valuation allowance, Unpaid Principal Balance | 1,462 | 1,879
Impaired loans without a valuation allowance, Average Recorded Investment | 1,277 | 4,659
Impaired loans without a valuation allowance, Interest Income Recognized | 63 | 180
Impaired loans with a valuation allowance, Recorded Investment | 1,214 | 164
Impaired loans with a valuation allowance, Unpaid Principal Balance | 1,241 | 243
Impaired loans with a valuation allowance, Related Allowance | 445 | 4
Impaired loans with a valuation allowance, Average Recorded Investment | 725 | 306
Impaired loans with a valuation allowance, Interest Income Recognized | 50 | 70
Total impaired loans, Recorded Investment |  | 2,015
Total impaired loans, Unpaid Principal Balance |  | 2,122
Total impaired loans, Average Recorded Investment |  | 4,965
Total impaired loans, Interest Income Recognized |  | 250
All Other Loans [Member] | Commercial Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans without a valuation allowance, Recorded Investment | 424 | 119
Impaired loans without a valuation allowance, Unpaid Principal Balance | 454 | 119
Impaired loans without a valuation allowance, Average Recorded Investment | 204 | 1,311
Impaired loans without a valuation allowance, Interest Income Recognized | 44 | 73
Impaired loans with a valuation allowance, Recorded Investment | 23 | 0
Impaired loans with a valuation allowance, Unpaid Principal Balance | 23 | 0
Impaired loans with a valuation allowance, Related Allowance | 5 | 0
Impaired loans with a valuation allowance, Average Recorded Investment | 5 | 0
Impaired loans with a valuation allowance, Interest Income Recognized | 1 | 0
All Other Loans [Member] | Consumer Real Estate [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans without a valuation allowance, Recorded Investment | 415 | 821
Impaired loans without a valuation allowance, Unpaid Principal Balance | 420 | 849
Impaired loans without a valuation allowance, Average Recorded Investment | 401 | 2,334
Impaired loans without a valuation allowance, Interest Income Recognized | 16 | 100
Impaired loans with a valuation allowance, Recorded Investment | 1,007 | 0
Impaired loans with a valuation allowance, Unpaid Principal Balance | 1,033 | 0
Impaired loans with a valuation allowance, Related Allowance | 256 | 0
Impaired loans with a valuation allowance, Average Recorded Investment | 601 | 0
Impaired loans with a valuation allowance, Interest Income Recognized | 38 | 0
All Other Loans [Member] | Construction and Land Development [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans without a valuation allowance, Recorded Investment | 547 | 865
Impaired loans without a valuation allowance, Unpaid Principal Balance | 547 | 865
Impaired loans without a valuation allowance, Average Recorded Investment | 628 | 967
Impaired loans without a valuation allowance, Interest Income Recognized | 0 | 3
Impaired loans with a valuation allowance, Recorded Investment | 0 | 0
Impaired loans with a valuation allowance, Unpaid Principal Balance | 0 | 0
Impaired loans with a valuation allowance, Related Allowance | 0 | 0
Impaired loans with a valuation allowance, Average Recorded Investment | 0 | 0
Impaired loans with a valuation allowance, Interest Income Recognized | 0 | 0
All Other Loans [Member] | Commercial and Industrial [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans without a valuation allowance, Recorded Investment | 41 | 46
Impaired loans without a valuation allowance, Unpaid Principal Balance | 41 | 46
Impaired loans without a valuation allowance, Average Recorded Investment | 44 | 47
Impaired loans without a valuation allowance, Interest Income Recognized | 3 | 4
Impaired loans with a valuation allowance, Recorded Investment | 172 | 164
Impaired loans with a valuation allowance, Unpaid Principal Balance | 172 | 243
Impaired loans with a valuation allowance, Related Allowance | 172 | 4
Impaired loans with a valuation allowance, Average Recorded Investment | 117 | 306
Impaired loans with a valuation allowance, Interest Income Recognized | 10 | 70
All Other Loans [Member] | Consumer and Other [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans without a valuation allowance, Recorded Investment | 0 | 0
Impaired loans without a valuation allowance, Unpaid Principal Balance | 0 | 0
Impaired loans without a valuation allowance, Average Recorded Investment | 0 | 0
Impaired loans without a valuation allowance, Interest Income Recognized | 0 | 0
Impaired loans with a valuation allowance, Recorded Investment | 12 | 0
Impaired loans with a valuation allowance, Unpaid Principal Balance | 13 | 0
Impaired loans with a valuation allowance, Related Allowance | 12 | 0
Impaired loans with a valuation allowance, Average Recorded Investment | 2 | 0
Impaired loans with a valuation allowance, Interest Income Recognized | 1 | $ 0
Purchased Credit Impaired Loans [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Impaired loans with a valuation allowance, Recorded Investment | 16 |
Impaired loans with a valuation allowance, Unpaid Principal Balance | 123 |
Impaired loans with a valuation allowance, Related Allowance | 16 |
Impaired loans with a valuation allowance, Average Recorded Investment | 3 |
Impaired loans with a valuation allowance, Interest Income Recognized | $ 16 |

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_FinancingReceivableImpairedLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5258-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableAverageRecordedInvestment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of interest income recognized on a cash-basis method of accounting that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableInterestIncomeCashBasisMethod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953550-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableRecordedInvestment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of allowance for credit losses related to recorded investment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableRelatedAllowance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableUnpaidPrincipalBalance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of average investment of impaired financing receivables for which there is no related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5258-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceAverageRecordedInvestment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of interest income, recognized on cash basis, on financing receivables, for which there is no related allowance for credit losses and are recognized as impaired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceInterestIncomeCashBasisMethod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of investment in impaired financing receivables for which there is no related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953550-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceRecordedInvestment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of unpaid principal balance of impaired financing receivables for which there is no related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableWithNoRelatedAllowanceUnpaidPrincipalBalance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of average investment of impaired financing receivables for which there is a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5258-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceAverageRecordedInvestment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of interest income on financing receivables, for which there is a related allowance for credit losses, recognized on a cash-basis method of accounting that the financing receivables were impaired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceInterestIncomeCashBasisMethod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of investment in impaired financing receivables for which there is a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953550-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Unpaid principal balance of impaired financing receivables for which there is a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceUnpaidPrincipalBalance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_ReceivablesAcquiredWithDeterioratedCreditQualityAxis=smbk_ReceivablesOtherthanReceivablesAcquiredwithDeterioratedCreditQualityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialRealEstatePortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=smbk_ConstructionPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ReceivablesAcquiredWithDeterioratedCreditQualityAxis=us-gaap_ReceivablesAcquiredWithDeterioratedCreditQualityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |