Securities (Tables)

9 Months Ended

Sep. 30, 2012

Securities Available for Sale

This table provides detailed information about securities available for sale at September 30, 2012 and December 31, 2011 (in thousands):

September 30, 2012	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
U.S. Treasury	$	117,064	$	1,489	$	(36	)	$	118,517
U.S. Agencies		809,490		8,047		(13	)		817,524
Mortgage-backed		3,344,828		91,997		(202	)		3,436,623
State and political subdivisions		1,827,424		56,572		(269	)		1,883,727
Corporates		227,954		2,811		(32	)		230,733
Total	$	6,326,760	$	160,916	$	(552	)	$	6,487,124
December 31, 2011	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
U.S. Treasury	$	184,523	$	4,802	$	—		$	189,325
U.S. Agencies		1,615,637		16,434		(62	)		1,632,009
Mortgage-backed		2,437,282		55,985		(919	)		2,492,348
State and political subdivisions		1,642,844		51,336		(144	)		1,694,036
Corporates		99,620		566		(22	)		100,164
Total	$	5,979,906	$	129,123	$	(1,147	)	$	6,107,882

Securities Held to Maturity

The table below provides detailed information for securities held to maturity at September 30, 2012 and December 31, 2011 (in thousands):

September 30, 2012	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
State and political subdivisions	$	98,479	$	14,742	$	—	$	113,221
December 31, 2011
State and political subdivisions	$	89,246	$	13,041	$	—	$	102,287

Available For Sale Investments' Gross Unrealized Losses and Fair Value, Aggregated by Investment Category and Length of Time that Individual Securities have been in Continuous Unrealized Loss Position

The following table shows the Company’s available for sale investments’ gross unrealized losses and fair value, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at September 30, 2012 and December 31, 2011 (in thousands).

September 30, 2012	Less than 12 months					12 months or more					Total
Description of Securities	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
U.S. Treasury	$	10,141	$	(36	)	$	—	$	—		$	10,141	$	(36	)
U.S. Agencies		35,284		(13	)		—		—			35,284		(13	)
Mortgage-backed		57,372		(202	)		—		—			57,372		(202	)
State and political subdivisions		58,622		(268	)		1,917		(1	)		60,539		(269	)
Corporates		27,711		(32	)		—		—			27,711		(32	)
Total temporarily- impaired debt securities available for sale	$	189,130	$	(551	)	$	1,917	$	(1	)	$	191,047	$	(552	)

December 31, 2011	Less than 12 months					12 months or more					Total
Description of Securities	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
U.S. Treasury	$	—	$	—		$	—	$	—		$	—	$	—
U.S. Agencies		66,992		(62	)		—		—			66,992		(62	)
Mortgage-backed		226,081		(919	)		—		—			226,081		(919	)
State and political subdivisions		45,918		(139	)		2,571		(5	)		48,489		(144	)
Corporates		12,471		(22	)		—		—			12,471		(22	)
Total temporarily- impaired debt securities available for sale	$	351,462	$	(1,142	)	$	2,571	$	(5	)	$	354,033	$	(1,147	)

Held-to-maturity Securities

Contractual Maturity Information

The following table presents contractual maturity information for securities held to maturity at September 30, 2012 (in thousands):

	Amortized Cost		Fair Value
Due in 1 year or less	$	2,042	$	2,348
Due after 1 year through 5 years		24,846		28,565
Due after 5 years through 10 years		23,724		27,275
Due after 10 years		47,867		55,033
Total securities held to maturity	$	98,479	$	113,221

Available-for-sale Securities

Contractual Maturity Information

The following table presents contractual maturity information for securities available for sale at September 30, 2012 (in thousands):

	Amortized Cost		Fair Value
Due in 1 year or less	$	503,011	$	505,373
Due after 1 year through 5 years		1,679,302		1,714,184
Due after 5 years through 10 years		677,475		705,935
Due after 10 years		122,144		125,009
Total		2,981,932		3,050,501
Mortgage-backed securities		3,344,828		3,436,623
Total securities available for sale	$	6,326,760	$	6,487,124