Segment Information (Tables)

12 Months Ended

Dec. 31, 2011

Segment Reporting [Abstract]

Lines of business results and key performance measures

						FirstMerit
December 31, 2011	Commercial	Retail	Wealth	Other		Consolidated
OPERATIONS:
Net interest income	265,196	225,580	18,764	(29,913	)	479,627
Provision for loan losses	38,830	21,672	3,479	10,407		74,388
Other income	57,940	103,248	31,684	31,885		224,757
Other expenses	148,338	235,339	40,004	40,664		464,345
Net income	134,746	62,048	7,122	(84,358	)	119,558
AVERAGES :
Assets	6,203,526	2,935,699	240,952	5,115,153		14,495,330
Loans	6,201,990	2,661,910	227,710	64,363		9,155,973
Earnings assets	6,281,589	2,712,133	228,191	3,506,811		12,728,724
Deposits	3,027,329	7,500,213	644,879	240,080		11,412,501
Economic Capital	368,434	223,772	50,871	905,276		1,548,353

						FirstMerit
December 31, 2010	Commercial	Retail	Wealth	Other		Consolidated
OPERATIONS:
Net interest income	250,597	214,118	19,548	(25,744	)	458,519
Provision for loan losses	54,065	36,249	2,668	(4,767	)	88,215
Other income	46,876	114,497	32,596	18,587		212,556
Other expenses	110,261	224,334	39,604	68,661		442,860
Net income	86,545	44,220	6,416	(34,272	)	102,909
AVERAGES :
Assets	5,404,883	2,983,395	278,143	4,857,930		13,524,351
Loans	5,394,135	2,698,502	266,522	170,144		8,529,303
Earnings assets	5,456,316	2,742,696	266,835	3,291,138		11,756,985
Deposits	2,516,201	7,015,468	578,876	339,886		10,450,431
Economic Capital	308,547	223,304	36,881	746,889		1,315,621

						FirstMerit
December 31, 2009	Commercial	Retail	Wealth	Other		Consolidated
OPERATIONS:
Net interest income	154,504	188,491	17,846	(12,077	)	348,764
Provision for loan losses	24,110	60,780	8,085	5,458		98,433
Other income	41,344	104,212	32,342	32,403		210,301
Other expenses	92,470	194,848	37,838	27,661		352,817
Net income	51,524	24,098	2,771	3,777		82,170
AVERAGES :
Assets	4,071,785	2,864,636	306,690	3,550,383		10,793,494
Loans	4,101,451	2,685,133	297,589	72,810		7,156,983
Earnings assets	4,135,791	2,712,068	297,589	2,779,786		9,925,234
Deposits	1,934,036	4,708,554	533,039	333,959		7,509,588
Economic Capital	258,925	188,586	42,796	559,618		1,049,925