Segment Information (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012 segment	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Segment Information [Line Items]
Net interest income	$ 75,973	$ 62,319	$ 150,246	$ 123,686
Noninterest expense	86,027	79,758	177,314	159,683
Income before income taxes	38,095	22,943	68,158	43,894
Number of Operating Segments	2
Community Banking [Member]
Segment Information [Line Items]
Net interest income	66,866	73,975	136,298	143,064
Noninterest expense	61,005	69,066	122,824	131,243
Income before income taxes	36,539	31,875	71,142	57,491
Community Banking [Member] | Integra Bank [Member]
Segment Information [Line Items]
Net interest income	6,300		13,300
Noninterest expense	2,400		5,200
Income before income taxes	9,500		17,200
Other [Member] | Integra Bank [Member]
Segment Information [Line Items]
Net interest income	10,100		19,200
Noninterest expense	1,800		11,800
Income before income taxes	$ 1,100		$ 3,900