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Investment Securities (Tables)
 3 Months Ended
Mar. 31, 2017
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, 2017 and December 31, 2016: 

 (in thousands)
March 31, 2017
 
Amortized
 
Unrealized
 
Unrealized
 
Fair
 
Cost
 
Gains
 
Losses
 
Value
AVAILABLE FOR SALE:
 

 
 

 
 

 
 

Obligations of states and political subdivisions
$
303,534

 
$
6,276

 
$
(2,591
)
 
$
307,219

Residential mortgage-backed securities and collateralized mortgage obligations
2,968,607

 
3,693

 
(38,081
)
 
2,934,219

Investments in mutual funds and other equity securities
1,959

 
11

 
—

 
1,970

 
$
3,274,100

 
$
9,980

 
$
(40,672
)
 
$
3,243,408

HELD TO MATURITY:
 
 
 
 
 
 
 
Residential mortgage-backed securities and collateralized mortgage obligations
$
4,121

 
$
1,025

 
$
—

 
$
5,146

 
$
4,121

 
$
1,025

 
$
—

 
$
5,146


 (in thousands)
December 31, 2016
 
Amortized
 
Unrealized
 
Unrealized
 
Fair
 
Cost
 
Gains
 
Losses
 
Value
AVAILABLE FOR SALE:
 
 
 
 
 
 
 
Obligations of states and political subdivisions
$
305,708

 
$
5,526

 
$
(3,537
)
 
$
307,697

Residential mortgage-backed securities and collateralized mortgage obligations
2,428,387

 
3,664

 
(40,498
)
 
2,391,553

Investments in mutual funds and other equity securities
1,959

 
11

 
—

 
1,970

 
$
2,736,054

 
$
9,201

 
$
(44,035
)
 
$
2,701,220

HELD TO MATURITY:
 
 
 
 
 
 
 
Residential mortgage-backed securities and collateralized mortgage obligations
$
4,216

 
$
1,001

 
$
—

 
$
5,217

 
$
4,216

 
$
1,001

 
$
—

 
$
5,217
Schedule Of Fair Value And Unrealized Losses Of Securities
March 31, 2017
 
 
 
 
 
 
 
 
 
 
 
 (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:
 
 
 
 
 
 
 
 
 
 
 
Obligations of states and political subdivisions
$
57,669

 
$
2,119

 
$
1,828

 
$
472

 
$
59,497

 
$
2,591

Residential mortgage-backed securities and collateralized mortgage obligations
2,336,941

 
34,077

 
174,784

 
4,004

 
2,511,725

 
38,081

Total temporarily impaired securities
$
2,394,610

 
$
36,196

 
$
176,612

 
$
4,476

 
$
2,571,222

 
$
40,672


December 31, 2016
 
 
 
 
 
 
 
 
 
 
 
 (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:
 

 
 

 
 

 
 

 
 

 
 

Obligations of states and political subdivisions
$
71,571

 
$
3,065

 
$
1,828

 
$
472

 
$
73,399

 
$
3,537

Residential mortgage-backed securities and collateralized mortgage obligations
1,855,304

 
35,981

 
182,804

 
4,517

 
2,038,108

 
40,498

Total temporarily impaired securities
$
1,926,875

 
$
39,046

 
$
184,632

 
$
4,989

 
$
2,111,507

 
$
44,035
Schedule Of Maturities Of Investment Securities
The following table presents the maturities of investment securities at March 31, 2017: 
 
 (in thousands)
Available For Sale
 
Held To Maturity
 
Amortized
 
Fair
 
Amortized
 
Fair
 
Cost
 
Value
 
Cost
 
Value
AMOUNTS MATURING IN:
 
 
 
 
 
 
 
Three months or less
$
—

 
$
—

 
$
1

 
$
1

Over three months through twelve months
1,904

 
1,922

 
—

 
—

After one year through five years
80,558

 
81,463

 
—

 
—

After five years through ten years
402,632

 
406,211

 
9

 
10

After ten years
2,787,047

 
2,751,842

 
4,111

 
5,135

Other investment securities
1,959

 
1,970

 
—

 
—

 
$
3,274,100

 
$
3,243,408

 
$
4,121

 
$
5,146
Gross Realized Gains And Losses On Sales Of Available-For-Sale Securities
The following table presents the gross realized gains and losses on the sale of securities available for sale for the three months ended March 31, 2017 and 2016:

(in thousands)
Three Months Ended
 
March 31, 2017
 
March 31, 2016
 
Gains
 
Losses
 
Gains
 
Losses
Obligations of states and political subdivisions
$
—

 
$
2

 
$
696

 
$
—

 
$
—

 
$
2

 
$
696

 
$
—
Investment Securities Pledged To Secure Borrowings And Public Deposits
The following table presents, as of March 31, 2017, 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
$
507

 
$
514

To state and local governments to secure public deposits
897,105

 
895,844

Other securities pledged principally to secure repurchase agreements
434,549

 
429,702

Total pledged securities
$
1,332,161

 
$
1,326,060