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Investment Securities (Tables)
 3 Months Ended
Mar. 31, 2015
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, 2015 and December 31, 2014: 

 (in thousands)
March 31, 2015
 
Amortized
 
Unrealized
 
Unrealized
 
Fair
 
Cost
 
Gains
 
Losses
 
Value
AVAILABLE FOR SALE:
 
 
 
 
 
 
 
U.S. Treasury and agencies
$
213

 
$
16

 
$
—

 
$
229

Obligations of states and political subdivisions
321,744

 
16,398

 
(540
)
 
337,602

Residential mortgage-backed securities and collateralized mortgage obligations
2,179,212

 
23,398

 
(7,409
)
 
2,195,201

Investments in mutual funds and other equity securities
2,016

 
73

 
—

 
2,089

 
$
2,503,185

 
$
39,885

 
$
(7,949
)
 
$
2,535,121

HELD TO MATURITY:
 
 
 
 
 
 
 
Residential mortgage-backed securities and collateralized mortgage obligations
$
4,953

 
$
478

 
$
(2
)
 
$
5,429

 
$
4,953

 
$
478

 
$
(2
)
 
$
5,429


 (in thousands)
December 31, 2014
 
Amortized
 
Unrealized
 
Unrealized
 
Fair
 
Cost
 
Gains
 
Losses
 
Value
AVAILABLE FOR SALE:
 
 
 
 
 
 
 
U.S. Treasury and agencies
$
213

 
$
16

 
$
—

 
$
229

Obligations of states and political subdivisions
325,189

 
14,056

 
(841
)
 
338,404

Residential mortgage-backed securities and collateralized mortgage obligations
1,951,514

 
17,398

 
(11,060
)
 
1,957,852

Investments in mutual funds and other equity securities
2,016

 
54

 
—

 
2,070

 
$
2,278,932

 
$
31,524

 
$
(11,901
)
 
$
2,298,555

HELD TO MATURITY:
 
 
 
 
 
 
 
Residential mortgage-backed securities and collateralized mortgage obligations
$
5,088

 
$
358

 
$
(15
)
 
$
5,431

Other investment securities
123

 
—

 
—

 
123

 
$
5,211

 
$
358

 
$
(15
)
 
$
5,554
Schedule Of Fair Value And Unrealized Losses Of Securities
March 31, 2015
 
 
 
 
 
 
 
 
 
 
 
 (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
$
4,169

 
$
434

 
$
6,176

 
$
106

 
$
10,345

 
$
540

Residential mortgage-backed securities and collateralized mortgage obligations
368,351

 
1,242

 
360,210

 
6,167

 
728,561

 
7,409

Total temporarily impaired securities
$
372,520

 
$
1,676

 
$
366,386

 
$
6,273

 
$
738,906

 
$
7,949

HELD TO MATURITY:
 
 
 
 
 
 
 
 
 
 
 
Residential mortgage-backed securities and collateralized mortgage obligations
$
38

 
$
2

 
$
—

 
$
—

 
$
38

 
$
2

Total temporarily impaired securities
$
38

 
$
2

 
$
—

 
$
—

 
$
38

 
$
2


December 31, 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
$
11,100

 
$
547

 
$
8,550

 
$
294

 
$
19,650

 
$
841

Residential mortgage-backed securities and collateralized mortgage obligations
220,577

 
815

 
495,096

 
10,245

 
715,673

 
11,060

Total temporarily impaired securities
$
231,677

 
$
1,362

 
$
503,646

 
$
10,539

 
$
735,323

 
$
11,901

HELD TO MATURITY:
 
 
 
 
 
 
 
 
 
 
 
Residential mortgage-backed securities and collateralized mortgage obligations
$
224

 
$
15

 
$
—

 
$
—

 
$
224

 
$
15

Total temporarily impaired securities
$
224

 
$
15

 
$
—

 
$
—

 
$
224

 
$
15
Schedule Of Maturities Of Investment Securities
The following table presents the maturities of investment securities at March 31, 2015: 
 
 (in thousands)
Available For Sale
 
Held To Maturity
 
Amortized
 
Fair
 
Amortized
 
Fair
 
Cost
 
Value
 
Cost
 
Value
AMOUNTS MATURING IN:
 
 
 
 
 
 
 
Three months or less
$
9,860

 
$
9,888

 
$
—

 
$
—

Over three months through twelve months
56,364

 
57,003

 
—

 
—

After one year through five years
1,486,535

 
1,513,798

 
29

 
30

After five years through ten years
758,471

 
759,196

 
24

 
25

After ten years
189,939

 
193,147

 
4,900

 
5,374

Other investment securities
2,016

 
2,089

 
—

 
—

 
$
2,503,185

 
$
2,535,121

 
$
4,953

 
$
5,429
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, 2015 and 2014:

(in thousands)
Three Months Ended
 
March 31, 2015
 
March 31, 2014
 
Gains
 
Losses
 
Gains
 
Losses
Residential mortgage-backed securities and collateralized mortgage obligations
$
316

 
$
200

 
$
—

 
$
—

 
$
316

 
$
200

 
$
—

 
$
—
Investment Securities Pledged To Secure Borrowings And Public Deposits
The following table presents, as of March 31, 2015, 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
$
2,044

 
$
2,130

To state and local governments to secure public deposits
1,608,409

 
1,633,048

Other securities pledged principally to secure repurchase agreements
449,994

 
453,419

Total pledged securities
$
2,060,447

 
$
2,088,597