Segment Information (Tables)

3 Months Ended

Mar. 31, 2013

Segment Reporting [Abstract]

Lines of business results and key performance measures

						FirstMerit
	Commercial	Retail	Wealth	Other		Consolidated
March 31, 2013	1st Qtr	1st Qtr	1st Qtr	1st Qtr		1st Qtr
OPERATIONS:
Net interest income	65,519	46,431	3,775	(4,376	)	111,349
Provision for loan losses	4,766	4,073	208	899		9,946
Other income	19,232	24,388	8,310	5,462		57,392
Other expenses	43,027	52,907	10,174	817		106,925
Net income	24,022	8,996	1,107	3,221		37,346
AVERAGES:
Assets	6,737,236	3,016,495	236,811	4,993,001		14,983,543

										FirstMerit
	Commercial		Retail		Wealth		Other			Consolidated
March 31, 2012	1st Qtr		1st Qtr		1st Qtr		1st Qtr			1st Qtr
OPERATIONS:
Net interest income	$	63,853	$	54,277	$	4,598	$	(3,941	)	$	118,787
Provision for loan losses	9,104		2,537		225		2,195			14,061
Other income	14,309		25,265		8,068		4,084			51,726
Other expenses	43,351		57,481		10,214		2,722			113,768
Net income	16,709		12,691		1,447		(503		)	30,344
AVERAGES:
Assets	6,328,473		2,910,354		236,571		5,021,539			14,496,937