|
Document and Entity Information
|
9 Months Ended | |
|---|---|---|
|
Sep. 30, 2012
|
Nov. 12, 2012
|
|
| Document and Entity Information [Abstract] | ||
| Entity Registrant Name | BSB Bancorp, Inc. | |
| Entity Central Index Key | 0001522420 | |
| Document Type | 10-Q | |
| Document Period End Date | Sep. 30, 2012 | |
| Amendment Flag | false | |
| Document Fiscal Year Focus | 2012 | |
| Document Fiscal Period Focus | Q3 | |
| Current Fiscal Year End Date | --12-31 | |
| Entity Filer Category | Non-accelerated Filer | |
| Entity Common Stock, Shares Outstanding | 9,172,860 |