Mergers and Acquisitions (Details Narrative) (USD $) In Thousands, except Share data, unless otherwise specified	6 Months Ended	12 Months Ended		0 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012	Aug. 01, 2012 VIST Financial Corp. ("VIST Financial")	Aug. 01, 2012 VIST Financial Corp. ("VIST Financial") Core Deposits Intangible	Aug. 01, 2012 VIST Financial Corp. ("VIST Financial") Customer Related Intangibles
Business Acquisition [Line Items]
Total Assets				$ 1,400,000
Loans and leases				889,336
Deposits				(1,185,235)
Merger share conversion				$ 0.3127
Common stock issued, shares				2,093,689
Tompkins common stock issued				82,198
Cash payments for VIST Financial employee stock options				1,236
Fair value of VIST Financial employee stock options				1,107
Cash payment for VIST Financial TARP, warrants and accrued interest				26,454
Other intangible assets, net	17,400	18,643	3,761		10,700	5,300
Estimated useful life for amortization					10 years	15 years
Merger and acquisition integration-related expenses	$ 233	$ 15,600