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Investment Securities (Tables)
 6 Months Ended
Jun. 30, 2014
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 June 30, 2014 and December 31, 2013: 

 (in thousands)
June 30, 2014
 
Amortized
 
Unrealized
 
Unrealized
 
Fair
 
Cost
 
Gains
 
Losses
 
Value
AVAILABLE FOR SALE:
 
 
 
 
 
 
 
U.S. Treasury and agencies
$
214

 
$
19

 
$
—

 
$
233

Obligations of states and political subdivisions
336,607

 
13,428

 
(1,056
)
 
348,979

Residential mortgage-backed securities and collateralized mortgage obligations
2,229,391

 
22,995

 
(14,645
)
 
2,237,741

Investments in mutual funds and other equity securities
2,016

 
—

 
—

 
2,016

 
$
2,568,228

 
$
36,442

 
$
(15,701
)
 
$
2,588,969

HELD TO MATURITY:
 
 
 
 
 
 
 
Residential mortgage-backed securities and collateralized mortgage obligations
$
5,375

 
$
306

 
$
(42
)
 
$
5,639

Other investment securities
144

 
—

 
—

 
144

 
$
5,519

 
$
306

 
$
(42
)
 
$
5,783


 (in thousands)
December 31, 2013
 
Amortized
 
Unrealized
 
Unrealized
 
Fair
 
Cost
 
Gains
 
Losses
 
Value
AVAILABLE FOR SALE:
 
 
 
 
 
 
 
U.S. Treasury and agencies
$
249

 
$
20

 
$
(1
)
 
$
268

Obligations of states and political subdivisions
229,969

 
7,811

 
(2,575
)
 
235,205

Residential mortgage-backed securities and collateralized mortgage obligations
1,567,001

 
15,359

 
(28,819
)
 
1,553,541

Investments in mutual funds and other equity securities
1,959

 
5

 
—

 
1,964

 
$
1,799,178

 
$
23,195

 
$
(31,395
)
 
$
1,790,978

HELD TO MATURITY:
 
 
 
 
 
 
 
Residential mortgage-backed securities and collateralized mortgage obligations
$
5,563

 
$
330

 
$
(19
)
 
$
5,874

 
$
5,563

 
$
330

 
$
(19
)
 
$
5,874
Schedule Of Fair Value And Unrealized Losses Of Securities
June 30, 2014
 
 
 
 
 
 
 
 
 
 
 
 (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
$
7,145

 
$
647

 
$
24,892

 
$
409

 
$
32,037

 
$
1,056

Residential mortgage-backed securities and collateralized mortgage obligations
249,624

 
582

 
557,774

 
14,063

 
807,398

 
14,645

Total temporarily impaired securities
$
256,769

 
$
1,229

 
$
582,666

 
$
14,472

 
$
839,435

 
$
15,701

HELD TO MATURITY:
 
 
 
 
 
 
 
 
 
 
 
Residential mortgage-backed securities and collateralized mortgage obligations
$
210

 
$
42

 
$
—

 
$
—

 
$
210

 
$
42

Total temporarily impaired securities
$
210

 
$
42

 
$
—

 
$
—

 
$
210

 
$
42


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, 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
$
—

 
$
—

 
$
32

 
$
1

 
$
32

 
$
1

Obligations of states and political subdivisions
48,342

 
2,575

 
—

 
—

 
48,342

 
2,575

Residential mortgage-backed securities and collateralized mortgage obligations
475,982

 
15,951

 
249,695

 
12,868

 
725,677

 
28,819

Total temporarily impaired securities
$
524,324

 
$
18,526

 
$
249,727

 
$
12,869

 
$
774,051

 
$
31,395

HELD TO MATURITY:
 
 
 
 
 
 
 
 
 
 
 
Residential mortgage-backed securities and collateralized mortgage obligations
$
156

 
$
19

 
$
—

 
$
—

 
$
156

 
$
19

Total temporarily impaired securities
$
156

 
$
19

 
$
—

 
$
—

 
$
156

 
$
19
Schedule Of Maturities Of Investment Securities
The following table presents the maturities of investment securities at June 30, 2014: 
 
 (in thousands)
Available For Sale
 
Held To Maturity
 
Amortized
 
Fair
 
Amortized
 
Fair
 
Cost
 
Value
 
Cost
 
Value
AMOUNTS MATURING IN:
 
 
 
 
 
 
 
Three months or less
$
11,267

 
$
11,314

 
$
—

 
$
—

Over three months through twelve months
40,413

 
40,990

 
5

 
5

After one year through five years
1,522,689

 
1,548,906

 
27

 
28

After five years through ten years
887,929

 
879,608

 
29

 
31

After ten years
103,914

 
106,135

 
5,314

 
5,575

Other investment securities
2,016

 
2,016

 
144

 
144

 
$
2,568,228

 
$
2,588,969

 
$
5,519

 
$
5,783
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 six months ended June 30, 2014 and 2013:

(in thousands)
Three Months Ended
 
June 30, 2014
 
June 30, 2013
 
Gains
 
Losses
 
Gains
 
Losses
Obligations of states and political subdivisions
$
3

 
$
1

 
$
—

 
$
1

Residential mortgage-backed securities and collateralized mortgage obligations
974

 
—

 
—

 
—

Other debt securities
—

 
—

 
9

 
—

 
$
977

 
$
1

 
$
9

 
$
1

 
 
 
 
 
 
 
 
 
Six Months Ended
 
June 30, 2014
 
June 30, 2013
 
Gains
 
Losses
 
Gains
 
Losses
Obligations of states and political subdivisions
$
3

 
$
1

 
$
7

 
$
1

Residential mortgage-backed securities and collateralized mortgage obligations
974

 
—

 
—

 
—

Other debt securities
—

 
—

 
9

 
—

 
$
977

 
$
1

 
$
16

 
$
1
Investment Securities Pledged To Secure Borrowings And Public Deposits
The following table presents, as of June 30, 2014, 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
$
8,290

 
$
8,634

To state and local governments to secure public deposits
1,674,935

 
1,687,353

Other securities pledged principally to secure repurchase agreements
460,240

 
459,421

Total pledged securities
$
2,143,465

 
$
2,155,408