Investment Securities (Tables)

3 Months Ended

Mar. 31, 2012

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
March 31, 2012
Securities available for sale:
U.S. Government-sponsored enterprise obligations	$	306,811	$	3,075	$	(167	)	$	309,719
Obligations of state and political subdivisions		131,870		6,350		(191	)		138,029
Mortgage backed securities		1,335,071		27,647		(979	)		1,361,739
Other securities		1,461		75		—			1,536
Total securities available for sale	$	1,775,213	$	37,147	$	(1,337	)	$	1,811,023
Securities held to maturity:
U.S. Government-sponsored enterprise obligations	$	85,095	$	1,683	$	—		$	86,778
Obligations of state and political subdivisions		80,486		3,730		(73	)		84,143
Mortgage backed securities		24,503		759		—			25,262
Total securities held to maturity	$	190,084	$	6,172	$	(73	)	$	196,183
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

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
March 31, 2012
Securities available for sale:
U.S. Government-sponsored enterprise obligations	$	(167	)	$	67,848	$	—		$	—	$	(167	)	$	67,848
Obligations of state and political subdivisions		(6	)		334		(185	)		1,087		(191	)		1,421
Mortgage backed securities		(815	)		165,848		(164	)		16,856		(979	)		182,704
Total securities available for sale	$	(988	)	$	234,030	$	(349	)	$	17,943	$	(1,337	)	$	251,973
Securities held to maturity:
U.S. Government-sponsored enterprise obligations	$	—		$	—	$	—		$	—	$	—		$	—
Obligations of state and political subdivisions		(73	)		10,452		—			—		(73	)		10,452
Mortgage backed securities		—			—		—			—		—			—
Total securities held to maturity	$	(73	)	$	10,452	$	—		$	—	$	(73	)	$	10,452
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

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		1.43	%	$	40,084	$	40,352		1.21	%	$	20,258	$	20,324
One through five years		2.02			138,747		140,902		2.08			70,363		72,187
After five through ten years		2.39			555,529		569,060		3.07			22,653		23,834
Over ten years		2.44			1,040,853		1,060,709		3.12			76,810		79,838
Totals		2.37	%	$	1,775,213	$	1,811,023		2.53	%	$	190,084	$	196,183

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

	Three Months Ended March 31,
(dollars in thousands)	2012			2011
Realized gains	$	2,815		$	1
Realized losses		(15	)		—
Net realized gains	$	2,800		$	1