|
Document and Entity Information
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12 Months Ended |
|---|---|
|
Dec. 31, 2013
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|
| Document And Entity Information [Abstract] | |
| Document Type | S-1 |
| Amendment Flag | false |
| Document Period End Date | Dec. 31, 2013 |
| Trading Symbol | EBSB |
| Entity Registrant Name | Meridian Bancorp, Inc. |
| Entity Central Index Key | 0001600125 |
| Entity Filer Category | Accelerated Filer |