Federal and State Income Taxes (Tables)

6 Months Ended

Jun. 30, 2013

Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]

Reconciliation of income (loss) to income tax expense

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2013			2012			2013			2012
Amount:
Federal statutory tax	$	42,459		$	53,414		$	90,113		$	98,463
Tax exempt revenue	(1,803		)	(1,334		)	(3,545		)	(2,598		)
Effect of state income taxes, net of federal benefit	3,122			3,572			6,500			6,570
Utilization of tax credits	(1,826		)	(1,467		)	(3,548		)	(2,564		)
Bank-owned life insurance	(993		)	(976		)	(1,878		)	(1,955		)
Other, net	464			(60		)	877			753
Total	$	41,423		$	53,149		$	88,519		$	98,669

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2013		2012		2013		2012
Percent of pretax income:
Federal statutory tax	35	%	35	%	35	%	35	%
Tax exempt revenue	(1	)	(1	)	(1	)	(1	)
Effect of state income taxes, net of federal benefit	3		3		2		2
Utilization of tax credits	(2	)	(1	)	(1	)	(1	)
Bank-owned life insurance	(1	)	(1	)	(1	)	(1	)
Other, net	—		—		—		1
Total	34	%	35	%	34	%	35	%