Investment Securities (Tables)

3 Months Ended

Mar. 31, 2013

Investments, Debt and Equity Securities [Abstract]

Amortized Cost, Unrealized Gains And Losses, And Fair Value Of Investment Securities

The following table presents the amortized costs, unrealized gains, unrealized losses and approximate fair values of investment securities at March 31, 2013 and December 31, 2012: 

March 31, 2013

(in thousands)

	Amortized		Unrealized		Unrealized			Fair
	Cost		Gains		Losses			Value
AVAILABLE FOR SALE:
U.S. Treasury and agencies	$	45,276	$	162	$	(1	)	$	45,437
Obligations of states and political subdivisions	243,244		15,961		(218		)	258,987
Residential mortgage-backed securities and
collateralized mortgage obligations	2,069,664		25,854		(5,627		)	2,089,891
Other debt securities	143		88		—			231
Investments in mutual funds and
other equity securities	1,959		112		—			2,071
	$	2,360,286	$	42,177	$	(5,846	)	$	2,396,617
HELD TO MATURITY:
Obligations of states and political subdivisions	$	350	$	1	$	—		$	351
Residential mortgage-backed securities and
collateralized mortgage obligations	3,839		187		(16		)	4,010
	$	4,189	$	188	$	(16	)	$	4,361

December 31, 2012

(in thousands)

	Amortized		Unrealized		Unrealized			Fair
	Cost		Gains		Losses			Value
AVAILABLE FOR SALE:
U.S. Treasury and agencies	$	45,503	$	318	$	(1	)	$	45,820
Obligations of states and political subdivisions	245,606		18,119		—			263,725
Residential mortgage-backed securities and
collateralized mortgage obligations	2,291,253		28,747		(6,624		)	2,313,376
Other debt securities	143		79		—			222
Investments in mutual funds and
other equity securities	1,959		127		—			2,086
	$	2,584,464	$	47,390	$	(6,625	)	$	2,625,229
HELD TO MATURITY:
Obligations of states and political subdivisions	$	595	$	1	$	—		$	596
Residential mortgage-backed securities and
collateralized mortgage obligations	3,946		197		(7		)	4,136
	$	4,541	$	198	$	(7	)	$	4,732

Schedule Of Fair Value And Unrealized Losses Of Securities

March 31, 2013

(in thousands)

	Less than 12 Months				12 Months or Longer				Total
	Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
	Value		Losses		Value		Losses		Value		Losses
AVAILABLE FOR SALE:
U.S. Treasury and agencies	$	—	$	—	$	52	$	1	$	52	$	1
Obligations of states and political subdivisions	10,363		218		—		—		10,363		218
Residential mortgage-backed securities and
collateralized mortgage obligations	604,636		4,198		222,754		1,429		827,390		5,627
Total temporarily impaired securities	$	614,999	$	4,416	$	222,806	$	1,430	$	837,805	$	5,846
HELD TO MATURITY:
Residential mortgage-backed securities and
collateralized mortgage obligations	$	118	$	12	$	50	$	4	$	168	$	16
Total temporarily impaired securities	$	118	$	12	$	50	$	4	$	168	$	16

Unrealized losses on the impaired held to maturity collateralized mortgage obligations include the unrealized losses related to factors other than credit that are included in other comprehensive income. 

December 31, 2012

(in thousands)

	Less than 12 Months				12 Months or Longer				Total
	Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
	Value		Losses		Value		Losses		Value		Losses
AVAILABLE FOR SALE:
U.S. Treasury and agencies	$	—	$	—	$	59	$	1	$	59	$	1
Residential mortgage-backed securities and
collateralized mortgage obligations	780,234		5,548		106,096		1,076		886,330		6,624
Total temporarily impaired securities	$	780,234	$	5,548	$	106,155	$	1,077	$	886,389	$	6,625
HELD TO MATURITY:
Residential mortgage-backed securities and
collateralized mortgage obligations	$	—	$	—	$	48	$	7	$	48	$	7
Total temporarily impaired securities	$	—	$	—	$	48	$	7	$	48	$	7

Schedule Of Maturities Of Investment Securities

The following table presents the maturities of investment securities at March 31, 2013: 

(in thousands)

	Available For Sale				Held To Maturity
	Amortized		Fair		Amortized		Fair
	Cost		Value		Cost		Value
AMOUNTS MATURING IN:
Three months or less	$	73,106	$	73,295	$	350	$	351
Over three months through twelve months	348,163		351,017		—		—
After one year through five years	1,442,344		1,467,309		940		1,117
After five years through ten years	400,317		406,476		401		393
After ten years	94,397		96,449		2,498		2,500
Other investment securities	1,959		2,071		—		—
	$	2,360,286	$	2,396,617	$	4,189	$	4,361

Gross Realized Gains And Losses On Sales Of Available-For-Sale Securities

The following table presents the gross realized gains and gross realized losses on the sale of securities available for sale for the three months ended March 31, 2013 and 2012: 

(in thousands)

	Three months ended				Three months ended
	March 31, 2013				March 31, 2012
	Gains		Losses		Gains		Losses
U.S. Treasury and agencies	$	—	$	—	$	371	$	—
Obligations of states and political subdivisions	7		—		2		—
Residential mortgage-backed securities and
collateralized mortgage obligations	—		—		—		230
Other debt securities	—		—		5		—
	$	7	$	—	$	378	$	230

Investment Securities Pledged To Secure Borrowings And Public Deposits

The following table presents, as of March 31, 2013, investment securities which were pledged to secure borrowings, public deposits, and repurchase agreements as permitted or required by law: 

(in thousands)

	Amortized		Fair
	Cost		Value
To Federal Home Loan Bank to secure borrowings	$	47,663	$	48,838
To state and local governments to secure public deposits	736,556		751,180
Other securities pledged principally to secure repurchase agreements	194,609		195,728
Total pledged securities	$	978,828	$	995,746