Investment Securities (Tables)

12 Months Ended

Dec. 31, 2011

Investment Securities [Abstract]

Amortized Cost, Gross Unrealized Gains, And Fair Value Of Securities Held To Maturity

			Gross Unrealized Gains		Gross Unrealized Losses
	Amortized Cost							Fair Value
	(in thousands)
December 31, 2011
U.S. Treasury securities	$	100,018	$	13,841	$	—		$	113,859
Obligations of states and political subdivisions		433,284		19,931		(14	)		453,201
Residential mortgage-backed securities		1,180,104		51,041		(152	)		1,230,993
Trust preferred securities		193,312		4,308		(22,867	)		174,753
Corporate and other debt securities		52,198		3,799		(1,606	)		54,391
Total investment securities held to maturity	$	1,958,916	$	92,920	$	(24,639	)	$	2,027,197
December 31, 2010
U.S. Treasury securities	$	100,161	$	251	$	(909	)	$	99,503
Obligations of states and political subdivisions		387,280		2,146		(3,467	)		385,959
Residential mortgage-backed securities		1,114,469		30,728		(3,081	)		1,142,116
Trust preferred securities		269,368		5,891		(59,365	)		215,894
Corporate and other debt securities		52,715		2,911		(226	)		55,400
Total investment securities held to maturity	$	1,923,993	$	41,927	$	(67,048	)	$	1,898,872

Held To Maturity Securities Age Of Unrealized Losses And Fair Value Of Related Securities

	Less than Twelve Months					More than Twelve Months					Total
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
	(in thousands)
December 31, 2011
Obligations of states and political subdivisions	$	1,854	$	(13	)	$	50	$	(1	)	$	1,904	$	(14	)
Residential mortgage-backed securities		33,520		(152	)		—		—			33,520		(152	)
Trust preferred securities		35,527		(730	)		55,612		(22,137	)		91,139		(22,867	)
Corporate and other debt securities		14,756		(192	)		7,560		(1,414	)		22,316		(1,606	)
Total	$	85,657	$	(1,087	)	$	63,222	$	(23,552	)	$	148,879	$	(24,639	)

December 31, 2010
U.S. Treasury securities	$	57,027	$	(909	)	$	—	$	—		$	57,027	$	(909	)
Obligations of states and political subdivisions		123,399		(3,467	)		50		—			123,449		(3,467	)
Residential mortgage-backed securities		226,135		(3,081	)		—		—			226,135		(3,081	)
Trust preferred securities		14,152		(250	)		75,477		(59,115	)		89,629		(59,365	)
Corporate and other debt securities		7,971		(13	)		8,761		(213	)		16,732		(226	)
Total	$	428,684	$	(7,720	)	$	84,288	$	(59,328	)	$	512,972	$	(67,048	)

Contractual Maturities Of Debt Securities Held To Maturity

	December 31, 2011
	Amortized Cost		Fair Value
	(in thousands)
Due in one year	$	129,523	$	129,775
Due after one year through five years		44,746		45,839
Due after five years through ten years		189,250		210,535
Due after ten years		415,293		410,055
Residential mortgage-backed securities		1,180,104		1,230,993
Total investment securities held to maturity	$	1,958,916	$	2,027,197

Amortized Cost, Gross Unrealized Gains, And Fair Value Of Securities Available For Sale

	Amortized Cost		Unrealized Gains		Unrealized Losses			Fair Value
	(in thousands)
December 31, 2011
U.S. government agency securities	$	89,787	$	1,204	$	(243	)	$	90,748
Obligations of states and political subdivisions		18,893		1,322		(1	)		20,214
Residential mortgage-backed securities		304,631		10,950		(5,444	)		310,137
Trust preferred securities*		96,956		78		(33,176	)		63,858
Corporate and other debt securities		40,638		2,554		(3,582	)		39,610
Equity securities		47,932		1,320		(7,299	)		41,953
Total investment securities available for sale	$	598,837	$	17,428	$	(49,745	)	$	566,520
December 31, 2010
U.S. Treasury securities	$	162,404	$	1,406	$	—		$	163,810
U.S. government agency securities		88,926		26		(152	)		88,800
Obligations of states and political subdivisions		28,231		1,234		(3	)		29,462
Residential mortgage-backed securities		578,282		35,016		(2,940	)		610,358
Trust preferred securities*		54,060		1,142		(14,119	)		41,083
Corporate and other debt securities		53,379		2,612		(2,030	)		53,961
Equity securities		48,724		812		(1,728	)		47,808
Total investment securities available for sale	$	1,014,006	$	42,248	$	(20,972	)	$	1,035,282

* Includes three pooled trust preferred securities, principally collateralized by securities issued by banks and insurance companies.

Available For Sale Securities Age Of Unrealized Losses And Fair Value Of Related Securities

	Less than Twelve Months					More than Twelve Months					Total
	Fair Value		Unrealized Losses			Fair Value		Unrealized Losses			Fair Value		Unrealized Losses
	(in thousands)
December 31, 2011
U.S. government agency securities	$	7,980	$	(243	)	$	—	$	—		$	7,980	$	(243	)
Obligations of states and political subdivisions		141		(1	)		—		—			141		(1	)
Residential mortgage-backed securities		41,673		(1,655	)		22,639		(3,789	)		64,312		(5,444	)
Trust preferred securities		23,962		(1,061	)		38,191		(32,115	)		62,153		(33,176	)
Corporate and other debt securities		3,243		(173	)		6,567		(3,409	)		9,810		(3,582	)
Equity securities		20,570		(4,430	)		12,551		(2,869	)		33,121		(7,299	)
Total	$	97,569	$	(7,563	)	$	79,948	$	(42,182	)	$	177,517	$	(49,745	)

December 31, 2010
U.S. government agency securities	$	66,157	$	(152	)	$	—	$	—		$	66,157	$	(152	)
Obligations of states and political subdivisions		1,146		(3	)		—		—			1,146		(3	)
Residential mortgage-backed securities		11,439		(350	)		46,206		(2,590	)		57,645		(2,940	)
Trust preferred securities		1,262		(153	)		33,831		(13,966	)		35,093		(14,119	)
Corporate and other debt securities		—		—			7,944		(2,030	)		7,944		(2,030	)
Equity securities		1,538		(243	)		13,736		(1,485	)		15,274		(1,728	)
Total	$	81,542	$	(901	)	$	101,717	$	(20,071	)	$	183,259	$	(20,972	)

Contractual Maturities Of Debt Securities Available For Sale

	December 31, 2011
	Amortized Cost		Fair Value
	(in thousands)
Due in one year	$	452	$	455
Due after one year through five years		2,599		2,550
Due after five years through ten years		94,440		97,261
Due after ten years		148,783		114,164
Residential mortgage-backed securities		304,631		310,137
Equity securities		47,932		41,953
Total investment securities available for sale	$	598,837	$	566,520

Other-Than-Temporary Impairment Losses On Securities Recognized In Earnings

	2011		2010		2009
	(in thousands)
Held to maturity:
Trust preferred securities	$	18,314	$	—	$	—
Available for sale:
Residential mortgage-backed securities		829		2,265		5,735
Trust preferred securities		825		2,377		183
Equity securities		—		—		434
Net impairment losses on securities recognized in earnings	$	19,968	$	4,642	$	6,352

Realized Gains And Losses On Sales Of Investment Securities

	2011			2010			2009
	(in thousands)
Sales transactions:
Gross gains	$	31,456		$	8,615		$	8,006
Gross losses		—			(96	)		(36	)
	$	31,456		$	8,519		$	7,970
Maturities and other securities transactions:
Gross gains	$	623		$	3,158		$	79
Gross losses		(11	)		(79	)		(44	)
	$	612		$	3,079		$	35
Gains on securities transactions, net	$	32,068		$	11,598		$	8,005

Changes In The Credit Loss Component Of Cumulative Other-Than-Temporary Impairment Losses On Debt Securities

	2011			2010			2009
	(in thousands)
Balance, beginning of period	$	10,500		$	6,119		$	549
Additions:
Initial credit impairments		19,143			124			2,171
Subsequent credit impairments		825			4,518			3,747
Reductions:
Accretion of credit loss impairment due to anincrease in expected cash flows		(1,398	)		(261	)		(348	)
Balance, end of period	$	29,070		$	10,500		$	6,119