XML 117 R102.htm IDEA: XBRL DOCUMENT
v3.22.0.1

Regulatory Matters (Narrative) (Details) - Smart Bank [Member] - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Dividends | $ 10.0 | $ 13.9
Common stock dividends, quarterly (in dollars per share) | $ 0.06 | $ 0.05

X
- Definition Common Stock, Dividends, Per Share + References No definition available. + Details
Name: | smbk_CommonStockDividendsPerShare
Namespace Prefix: | smbk_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of paid and unpaid cash, stock, and paid-in-kind (PIK) dividends declared, for example, but not limited to, common and preferred stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817 + Details
Name: | us-gaap_Dividends
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=smbk_SmartBankMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |