Income Taxes (Schedule Of Significant Components Of Net Deferred Tax Assets (Liabilities)) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Income Taxes [Abstract]
Deferred Tax Assets Allowance for loan losses, net of recapture	$ 24,100	$ 29,334
Benefit plan accruals	7,881	1,369
AMT credit	25,765	25,509
Unrealized losses on benefit Plans	9,665	7,715
Net operating loss	2,860	3,452
Premises and equipment	30,348	35,657
Federal tax credits	4,066	3,621
Other-than-temporary-impairment	9,776	9,624
Loans - ASC 310	63,658	0
Other real estate owned	3,209	422
Other, net	6,032	6,005
Total deferred tax assets	187,360	122,708
Accretion on investment securities	(717)	(559)
Lease receivable, net	(5,263)	(7,761)
Purchase accounting	(4,215)	(11,605)
FDIC indemnification asset	(64,672)	0
Unrealized gains on available-for-sale investment securities	(15,873)	(2,600)
Unrealized gains on held-to-maturity securities	(3,160)	(3,773)
Unrealized gains on hedges	(96)	(567)
Other, net	(1,672)	(1,940)
Total deferred tax liabilities	(95,668)	(28,805)
Net deferred tax assets	$ 91,692	$ 93,903