Covered Loans (Composition Of Covered Loans By Lending Classification) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011
Covered Loans [Line Items]
Covered loans	$ 372,333		$ 626,360
Allowance for loan losses	(5,716)		(943)
Covered loans, net	366,617
Loans Accounted For Under ASC 310-30 (Purchased Credit Impaired) [Member]
Covered Loans [Line Items]
Allowance for loan losses	(5,716)
Covered loans, net	242,036
Loans Accounted For Under ASC 310-30 (1) (Not Purchased Credit Impaired) [Member]
Covered Loans [Line Items]
Allowance for loan losses	0	[1]
Covered loans, net	124,581	[1]
Commercial Segment [Member]
Covered Loans [Line Items]
Covered loans	55,639
Commercial Segment [Member] | Loans Accounted For Under ASC 310-30 (Purchased Credit Impaired) [Member]
Covered Loans [Line Items]
Covered loans	23,707
Commercial Segment [Member] | Loans Accounted For Under ASC 310-30 (1) (Not Purchased Credit Impaired) [Member]
Covered Loans [Line Items]
Covered loans	31,932	[1]
Commercial Real Estate Segment [Member]
Covered Loans [Line Items]
Covered loans	182,826
Commercial Real Estate Segment [Member] | Loans Accounted For Under ASC 310-30 (Purchased Credit Impaired) [Member]
Covered Loans [Line Items]
Covered loans	162,641
Commercial Real Estate Segment [Member] | Loans Accounted For Under ASC 310-30 (1) (Not Purchased Credit Impaired) [Member]
Covered Loans [Line Items]
Covered loans	20,185	[1]
Residential [Member]
Covered Loans [Line Items]
Covered loans	35,896
Residential [Member] | Loans Accounted For Under ASC 310-30 (Purchased Credit Impaired) [Member]
Covered Loans [Line Items]
Covered loans	35,741
Residential [Member] | Loans Accounted For Under ASC 310-30 (1) (Not Purchased Credit Impaired) [Member]
Covered Loans [Line Items]
Covered loans	155	[1]
Consumer Segment [Member]
Covered Loans [Line Items]
Covered loans	97,972
Consumer Segment [Member] | Loans Accounted For Under ASC 310-30 (Purchased Credit Impaired) [Member]
Covered Loans [Line Items]
Covered loans	25,663
Consumer Segment [Member] | Loans Accounted For Under ASC 310-30 (1) (Not Purchased Credit Impaired) [Member]
Covered Loans [Line Items]
Covered loans	72,309	[1]
Covered Loans [Member]
Covered Loans [Line Items]
Covered loans	372,333
Covered Loans [Member] | Loans Accounted For Under ASC 310-30 (Purchased Credit Impaired) [Member]
Covered Loans [Line Items]
Covered loans	247,752
Covered Loans [Member] | Loans Accounted For Under ASC 310-30 (1) (Not Purchased Credit Impaired) [Member]
Covered Loans [Line Items]
Covered loans	$ 124,581	[1]

[1] (1) Includes loans with revolving privileges which are scoped out of FASB ASC Topic 310-30 and certain loans which Old National elected to treat under the cost recovery method of accounting.