Income Taxes (Tables)

12 Months Ended

Dec. 31, 2011

Income Taxes [Abstract]

Income Tax Expense

	2011		2010		2009
Current income tax expense	$	60,533	$	52,932	$	63,575
Deferred income tax expense (benefit)		8,167		4,644		(9,854	)
Income tax expense	$	68,700	$	57,576	$	53,721

Income Tax Computed By Applying The U.S. Federal Statutory Income Tax Rate

	2011			2010			2009
Income tax expense computed at the statutory rate	$	100,182		$	93,219		$	81,464
Effect of tax-exempt interest		(35,741	)		(34,355	)		(26,673	)
Bank owned life insurance income		(1,416	)		(1,581	)		(1,694	)
Accrual adjustment for premium amortization on municipal securities		4,146			-			-
Other		1,529			293			624
Income tax expense, as reported	$	68,700		$	57,576		$	53,721

Schedule Of Deferred Tax Assets And Liabilities

	2011			2010
Deferred tax assets:
Allowance for loan losses	$	38,552		$	44,211
Net actuarial loss on defined benefit post-retirement benefit plans		23,131			15,269
Stock-based compensation		16,411			13,314
Bonus accrual		4,352			-
Gain on sale of assets		2,424			2,519
Non-accrual loans		1,763			2,083
Other		5,384			3,760
Total gross deferred tax assets		92,017			81,156
Deferred tax liabilities:
Net unrealized gain on securities available for sale and effective cash flow hedging derivatives		(156,528	)		(98,327	)
Premises and equipment		(23,948	)		(17,502	)
Defined benefit post-retirement benefit plans		(15,732	)		(13,638	)
Intangible assets		(7,383	)		(8,170	)
Leases		(5,563	)		(5,352	)
Bonus accrual 481(a) adjustment		(3,273	)		-
Prepaid expenses		(1,509	)		(1,413	)
Other		(1,772	)		(1,939	)
Total gross deferred tax liabilities		(215,708	)		(146,341	)
Net deferred tax asset (liability)	$	(123,691	)	$	(65,185	)