Investment Securities (Tables)

12 Months Ended

Dec. 31, 2011

Investment Securities [Abstract]

Schedule Of Amortized Cost And Fair Values Of Investment Securities, With Gross Unrealized Gains And Losses

(dollars in thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
December 31, 2011
Securities available for sale:
U.S. Government-sponsored enterprise obligations	$	336,859	$	5,633	$	(4	)	$	342,488
Obligations of state and political subdivisions		137,503		6,500		(198	)		143,805
Mortgage backed securities		1,289,775		28,317		(718	)		1,317,374
Other securities		1,460		78		—			1,538
Total securities available for sale	$	1,765,597	$	40,528	$	(920	)	$	1,805,205
Securities held to maturity:
U.S. Government-sponsored enterprise obligations	$	85,172	$	1,921	$	—		$	87,093
Obligations of state and political subdivisions		81,053		3,682		(57	)		84,678
Mortgage backed securities		26,539		800		—			27,339
Total securities held to maturity	$	192,764	$	6,403	$	(57	)	$	199,110
December 31, 2010
Securities available for sale:
U.S. Government-sponsored enterprise obligations	$	424,180	$	2,414	$	(3,794	)	$	422,800
Obligations of state and political subdivisions		39,896		668		(395	)		40,169
Mortgage backed securities		1,255,624		19,508		(11,263	)		1,263,869
Other securities		2,882		74		—			2,956
Total securities available for sale	$	1,722,582	$	22,664	$	(15,452	)	$	1,729,794
Securities held to maturity:
U.S. Government-sponsored enterprise obligations	$	180,479	$	2,549	$	(68	)	$	182,960
Obligations of state and political subdivisions		75,768		480		(1,728	)		74,520
Mortgage backed securities		33,773		741		—			34,514
Total securities held to maturity	$	290,020	$	3,770	$	(1,796	)	$	291,994

Schedule Of Exposure To Investment Security Issuers Exceed Ten Percentage Of Shareholders' Equity

(dollars in thousands)	Amortized Cost		Market Value
Federal National Mortgage Association (Fannie Mae)	$	878,108	$	896,142
Government National Mortgage Association (Ginnie Mae)		257,703		263,122
Federal Home Loan Mortgage Corporation (Freddie Mac)		467,908		477,175
Total	$	1,603,719	$	1,636,439

Schedule Of Securities With Gross Unrealized Losses Aggregated By Investment Category

	Less Than Twelve Months					Over Twelve Months					Total
(dollars in thousands)	Gross Unrealized Losses			Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses			Fair Value
December 31, 2011
Securities available for sale:
U.S. Government-sponsored enterprise obligations	$	(4	)	$	9,996	$	—		$	—	$	(4	)	$	9,996
Obligations of state and political subdivisions		(11	)		1,104		(187	)		1,085		(198	)		2,189
Mortgage backed securities		(545	)		147,803		(173	)		21,679		(718	)		169,482
Total securities available for sale	$	(560	)	$	158,903	$	(360	)	$	22,764	$	(920	)	$	181,667
Securities held to maturity:
U.S. Government-sponsored enterprise obligations	$	—		$	—	$	—		$	—	$	—		$	—
Obligations of state and political subdivisions		(26	)		2,354		(31	)		1,297		(57	)		3,651
Mortgage backed securities		—			—		—			—		—			—
Total securities held to maturity	$	(26	)	$	2,354	$	(31	)	$	1,297	$	(57	)	$	3,651
December 31, 2010
Securities available for sale:
U.S. Government-sponsored enterprise obligations	$	(3,794	)	$	195,785	$	—		$	—	$	(3,794	)	$	195,785
Obligations of state and political subdivisions		(395	)		6,771		—			—		(395	)		6,771
Mortgage backed securities		(10,678	)		528,280		(585	)		20,908		(11,263	)		549,188
Total securities available for sale	$	(14,867	)	$	730,836	$	(585	)	$	20,908	$	(15,452	)	$	751,744
Securities held to maturity:
U.S. Government-sponsored enterprise obligations	$	(68	)	$	7,075	$	—		$	—	$	(68	)	$	7,075
Obligations of state and political subdivisions		(1,526	)		36,646		(202	)		1,128		(1,728	)		37,774
Mortgage backed securities		—			—		—			—		—			—
Total securities held to maturity	$	(1,594	)	$	43,721	$	(202	)	$	1,128	$	(1,796	)	$	44,849

Schedule Of Amortized Cost And Estimated Fair Value By Maturity Of Investment Securities

	Securities Available for Sale							Securities Held to Maturity
(dollars in thousands)	Weighted Average Yield			Amortized Cost		Fair Value		Weighted Average Yield			Amortized Cost		Fair Value
Within one year or less		2.38	%	$	11,116	$	11,298		1.28	%	$	20,971	$	21,087
One through five years		2.21			152,826		155,746		2.12			70,563		72,555
After five through ten years		2.41			567,138		582,033		3.08			24,553		25,927
Over ten years		2.49			1,034,517		1,056,128		3.08			76,677		79,541
Totals		2.44	%	$	1,765,597	$	1,805,205		2.53	%	$	192,764	$	199,110

Schedule Of Realized Gains And Losses From The Sale Of Securities Classified As Available For Sale

	Years Ended December 31,
(dollars in thousands)	2011			2010		2009
Realized gains	$	3,429		$	5,172	$	6,775
Realized losses		(7	)		—		(40	)
Net realized gains	$	3,422		$	5,172	$	6,735