Fair Values (Schedule Of Carrying Value And Fair Value Of Financial Instruments Not Recorded At Fair Value) (Details) (USD $) In Thousands, unless otherwise specified							12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008	Dec. 31, 2011 Carrying Value [Member]	Dec. 31, 2010 Carrying Value [Member]	Dec. 31, 2011 Estimated Fair Value [Member]	Dec. 31, 2010 Estimated Fair Value [Member]
Cash and cash equivalents	$ 152,265	$ 111,946			$ 598,766	$ 1,004,125	$ 598,766	$ 1,004,125
Trading securities	2,309	3,024			2,309	3,024	2,309	3,024
Securities available for sale	3,168,578	2,919,180			3,168,578	2,919,180	3,168,578	2,919,180
Securities held to maturity	4,714	4,762			4,714	4,762	4,759	4,774
Loans held for sale	98,691	75,626			98,691	75,626	98,691	75,626
Non-covered loans and leases, net	5,888,098	5,658,987			5,795,130	5,557,066	5,816,714	5,767,506
Covered loans and leases	622,451	785,898			622,451	785,898	722,295	893,682
Restricted equity securities	32,581	34,475			32,581	34,475	32,581	34,475
Mortgage servicing rights	18,184	14,454	12,625	8,205	18,184	14,454	18,184	14,454
Bank owned life insurance assets					92,555	90,161	92,555	90,161
FDIC indemnification asset	91,089	146,413			91,089	146,413	47,008	90,011
Derivatives	7,955	1,060			7,955	1,060	7,955	1,060
Visa Class B common stock							19,230	15,987
Deposits	9,236,690	9,433,805	7,440,434		9,236,690	9,433,805	9,260,327	9,464,406
Securities sold under agreement to repurchase	124,605	73,759			124,605	73,759	124,605	73,759
Term debt	255,676	262,760			255,676	262,760	284,911	282,127
Junior subordinated debentures, at fair value	82,905	80,688			82,905	80,688	82,905	80,688
Junior subordinated debentures, at amortized cost	102,544	102,866			102,544	102,866	68,698	65,771
Derivatives	$ 6,509	$ 361			$ 6,509	$ 361	$ 6,509	$ 361