Investments (Tables)

6 Months Ended

Jun. 30, 2011

Aggregate Values And Unrealized Gains And Losses Of Investment Securities


	Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Investment securities available for sale
June 30, 2011
U. S. Treasury	$	1,286,978	$	2,309	$	5	$	1,289,282
Government agency		1,904,135		1,846		1,140		1,904,843
Corporate bonds		461,756		5,258		43		466,971
Residential mortgage-backed securities		327,531		6,403		451		333,483
Equity securities		965		17,644		—		18,609
State, county and municipal		1,037		19		3		1,053

Total investment securities available for sale	$	3,982,402	$	33,481	$	1,642	$	4,014,241

December 31, 2010
U. S. Treasury	$	1,935,666	$	4,041	$	307	$	1,939,400
Government agency		1,930,469		361		10,844		1,919,986
Corporate bonds		479,160		7,498		—		486,658
Residential mortgage-backed securities		139,291		4,522		268		143,545
Equity securities		1,055		18,176		—		19,231
State, county and municipal		1,240		20		4		1,256

Total investment securities available for sale	$	4,486,881	$	34,618	$	11,423	$	4,510,076

June 30, 2010
U. S. Treasury	$	2,173,759	$	9,219	$	—	$	2,182,978
Government agency		899,375		2,387		23		901,739
Corporate bonds		480,738		8,845		—		489,583
Residential mortgage-backed securities		168,307		6,313		104		174,516
Equity securities		1,358		17,333		—		18,691
State, county and municipal		1,242		30		2		1,270

Total investment securities available for sale	$	3,724,779	$	44,127	$	129	$	3,768,777


Investment securities held to maturity
June 30, 2011
Residential mortgage-backed securities	$	2,098	$	206	$	26	$	2,278

December 31, 2010
Residential mortgage-backed securities	$	2,532	$	235	$	26	$	2,741

June 30, 2010
Residential mortgage-backed securities	$	2,933	$	276	$	26	$	3,183
State, county and municipal		151		—		—		151

Total investment securities held to maturity	$	3,084	$	276	$	26	$	3,334

Investment Securities Maturity Information


	June 30, 2011				December 31, 2010				June 30, 2010
	Cost		Fair Value		Cost		Fair Value		Cost		Fair Value
Investment securities available for sale
Maturing in:
One year or less	$	3,133,236	$	3,140,002	$	3,441,185	$	3,436,818	$	2,342,011	$	2,351,171
One through five years		549,912		551,647		916,101		921,536		1,220,914		1,232,535
Five through 10 years		99,834		100,387		1,683		1,710		1,912		1,946
Over 10 years		198,456		203,596		126,857		130,781		158,584		164,434
Equity securities		965		18,609		1,055		19,231		1,358		18,691

Total investment securities available for sale	$	3,982,402	$	4,014,241	$	4,486,881	$	4,510,076	$	3,724,779	$	3,768,777


Investment securities held to maturity
Maturing in:
One through five years	$	8	$	6	$	—	$	—	$	151	$	151
Five through 10 years		1,973		2,110		2,404		2,570		2,797		3,005
Over 10 years		117		162		128		171		136		178

Total investment securities held to maturity	$	2,098	$	2,278	$	2,532	$	2,741	$	3,084	$	3,334

Investment Securities With Unrealized Losses


	Less than 12 months				12 months or more				Total
	Fair Value		Unrealized Losses		Fair Value		Unrealized Losses		Fair Value		Unrealized Losses
June 30, 2011
Investment securities available for sale:

U. S. Treasury	$	50,307	$	5	$	—	$	—	$	50,307	$	5
Government agency		507,210		1,140		—		—		507,210		1,140
Corporate bonds		9,957		43		—		—		9,957		43
Residential mortgage-backed securities		80,866		401		2,016		50		82,882		451
State, county and municipal		529		3		10		—		539		3

Total	$	648,869	$	1,592	$	2,026	$	50	$	650,895	$	1,642

Investment securities held to maturity:
Residential mortgage-backed securities	$	—	$	—	$	24	$	26	$	24	$	26

June 30, 2010
Investment securities available for sale:
Government agency	$	4,005	$	23	$	—	$	—	$	4,005	$	23
Residential mortgage-backed securities		5,151		81		1,152		23		6,303		104
State, county and municipal		—		—		439		2		439		2

Total	$	9,156	$	104	$	1,591	$	25	$	10,747	$	129

Investment securities held to maturity:
Residential mortgage-backed securities	$	—	$	—	$	29	$	26	$	29	$	26

Securities Gains (Losses)


	Three months ended June 30,						Six months ended June 30,
	2011			2010			2011			2010
Gross gains on sales of investment securities available for sale	$	—		$	—		$	156		$	2,860
Gross losses on sales of investment securities available for sale		(96	)		—			(701	)		(1,729	)
Other that temporary impairment loss on equity securities		—			(186	)		—			(186	)

Total securities gains (losses)	$	(96	)	$	(186	)	$	(545	)	$	945