Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2016	Jul. 31, 2016
Document and Entity Information [Abstract]
Entity Registrant Name	1ST CONSTITUTION BANCORP
Document Type	10-Q
Current Fiscal year End Date	--12-31
Amendment Flag	false
Entity CIK	0001141807
Entity Filer Category	Smaller Reporting Company
Document Period End Date	Jun. 30, 2016
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	Q2
Entity Common stock, Shares Outstanding		7,952,794