|
Document and Entity Information
|
12 Months Ended |
|---|---|
|
Dec. 31, 2014
|
|
| Document And Entity Information [Abstract] | |
| Document Type | S-1/A |
| Amendment Flag | false |
| Document Period End Date | Dec. 31, 2014 |
| Document Fiscal Year Focus | 2014 |
| Document Fiscal Period Focus | FY |
| Entity Registrant Name | NATIONAL COMMERCE CORPORATION |
| Entity Central Index Key | 0001609951 |
| Current Fiscal Year End Date | --12-31 |
| Entity Filer Category | Smaller Reporting Company |