Federal and State Income Taxes (Tables)

3 Months Ended

Mar. 31, 2013

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

Reconciliation of income (loss) to income tax expense

	Three Months Ended
	March 31,
	2013			2012
Amount:
Federal statutory tax	$	47,654		$	45,050
Tax exempt revenue	(1,742		)	(1,264		)
Effect of state income taxes, net of federal benefit	3,378			2,998
Utilization of tax credits	(1,722		)	(1,097		)
Bank-owned life insurance	(885		)	(979		)
Other, net	413			812
Total	$	47,096		$	45,520

	Three Months Ended
	March 31,
	2013		2012
Percent of pretax income:
Federal statutory tax	35	%	35	%
Tax exempt revenue	(1	)	(1	)
Effect of state income taxes, net of federal benefit	3		2
Utilization of tax credits	(1	)	(1	)
Bank-owned life insurance	(1	)	(1	)
Other, net	—		1
Total	35	%	35	%