Investment Securities (Tables)

9 Months Ended

Sep. 30, 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 September 30, 2013 and December 31, 2012: 

September 30, 2013

(in thousands)

	Amortized		Unrealized		Unrealized			Fair
	Cost		Gains		Losses			Value
AVAILABLE FOR SALE:
U.S. Treasury and agencies	$	256	$	22	$	—		$	278
Obligations of states and political subdivisions	233,499		9,146		(2,114		)	240,531
Residential mortgage-backed securities and
collateralized mortgage obligations	1,668,904		18,140		(19,900		)	1,667,144
Other debt securities	60		74		—			134
Investments in mutual funds and
other equity securities	1,959		36		—			1,995
	$	1,904,678	$	27,418	$	(22,014	)	$	1,910,082
HELD TO MATURITY:
Residential mortgage-backed securities and
collateralized mortgage obligations	$	5,766	$	265	$	(1	)	$	6,030
	$	5,766	$	265	$	(1	)	$	6,030

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

September 30, 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	$	—	$	—	$	—	$	—	$	—	$	—
Obligations of states and political subdivisions	47,814		2,114		—		—		47,814		2,114
Residential mortgage-backed securities and
collateralized mortgage obligations	440,921		13,680		264,968		6,220		705,889		19,900
Total temporarily impaired securities	$	488,735	$	15,794	$	264,968	$	6,220	$	753,703	$	22,014
HELD TO MATURITY:
Residential mortgage-backed securities and
collateralized mortgage obligations	$	—	$	—	$	46	$	1	$	46	$	1
Total temporarily impaired securities	$	—	$	—	$	46	$	1	$	46	$	1

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 September 30, 2013: 

(in thousands)

	Available For Sale				Held To Maturity
	Amortized		Fair		Amortized		Fair
	Cost		Value		Cost		Value
AMOUNTS MATURING IN:
Three months or less	$	18,573	$	18,569	$	—	$	—
Over three months through twelve months	191,763		194,660		338		378
After one year through five years	1,294,846		1,303,726		863		1,085
After five years through ten years	361,759		354,446		89		89
After ten years	35,778		36,687		4,476		4,478
Other investment securities	1,959		1,994		—		—
	$	1,904,678	$	1,910,082	$	5,766	$	6,030

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 and nine months ended September 30, 2013 and 2012: 

(in thousands)

	Three months ended				Three months ended
	September 30, 2013				September 30, 2012
	Gains		Losses		Gains		Losses
U.S. Treasury and agencies	$	—	$	—	$	—	$	—
Obligations of states and political subdivisions	3		—		8		—
Residential mortgage-backed securities and
collateralized mortgage obligations	—		—		—		—
Other debt securities	—		—		13		—
	$	3	$	—	$	21	$	—
(in thousands)
	Nine months ended				Nine months ended
	September 30, 2013				September 30, 2012
	Gains		Losses		Gains		Losses
U.S. Treasury and agencies	$	—	$	—	$	371	$	—
Obligations of states and political subdivisions	10		1		10		1
Residential mortgage-backed securities and
collateralized mortgage obligations	—		—		1,484		683
Other debt securities	9		—		18		—
	$	19	$	1	$	1,883	$	684

Investment Securities Pledged To Secure Borrowings And Public Deposits

The following table presents, as of September 30, 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	$	16,831	$	17,287
To state and local governments to secure public deposits	810,529		808,734
Other securities pledged principally to secure repurchase agreements	307,164		304,093
Total pledged securities	$	1,134,524	$	1,130,114