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Investment Securities (Tables)
 9 Months Ended
Sep. 30, 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 September 30, 2015 and December 31, 2014: 

 (in thousands)
September 30, 2015
 
Amortized
 
Unrealized
 
Unrealized
 
Fair
 
Cost
 
Gains
 
Losses
 
Value
AVAILABLE FOR SALE:
 
 
 
 
 
 
 
Obligations of states and political subdivisions
$
314,305

 
$
12,974

 
$
(815
)
 
$
326,464

Residential mortgage-backed securities and collateralized mortgage obligations
2,143,275

 
18,866

 
(8,208
)
 
2,153,933

Investments in mutual funds and other equity securities
2,016

 
65

 
—

 
2,081

 
$
2,459,596

 
$
31,905

 
$
(9,023
)
 
$
2,482,478

HELD TO MATURITY:
 
 
 
 
 
 
 
Residential mortgage-backed securities and collateralized mortgage obligations
$
4,699

 
$
582

 
$
(1
)
 
$
5,280

 
$
4,699

 
$
582

 
$
(1
)
 
$
5,280


 (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
September 30, 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
$
12,536

 
$
158

 
$
8,034

 
$
657

 
$
20,570

 
$
815

Residential mortgage-backed securities and collateralized mortgage obligations
463,453

 
3,239

 
312,840

 
4,969

 
776,293

 
8,208

Total temporarily impaired securities
$
475,989

 
$
3,397

 
$
320,874

 
$
5,626

 
$
796,863

 
$
9,023

HELD TO MATURITY:
 
 
 
 
 
 
 
 
 
 
 
Residential mortgage-backed securities and collateralized mortgage obligations
$
39

 
$
1

 
$
—

 
$
—

 
$
39

 
$
1

Total temporarily impaired securities
$
39

 
$
1

 
$
—

 
$
—

 
$
39

 
$
1


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 September 30, 2015: 
 
 (in thousands)
Available For Sale
 
Held To Maturity
 
Amortized
 
Fair
 
Amortized
 
Fair
 
Cost
 
Value
 
Cost
 
Value
AMOUNTS MATURING IN:
 
 
 
 
 
 
 
Three months or less
$
13,055

 
$
13,108

 
$
—

 
$
—

Over three months through twelve months
82,603

 
83,377

 
9

 
12

After one year through five years
1,778,642

 
1,798,598

 
391

 
934

After five years through ten years
431,360

 
431,514

 
239

 
273

After ten years
151,920

 
153,800

 
4,060

 
4,061

Other investment securities
2,016

 
2,081

 
—

 
—

 
$
2,459,596

 
$
2,482,478

 
$
4,699

 
$
5,280
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 and nine months ended September 30, 2015 and 2014:

(in thousands)
Three Months Ended
 
September 30, 2015
 
September 30, 2014
 
Gains
 
Losses
 
Gains
 
Losses
U.S. Treasury and agencies
$
13

 
$
—

 
$
—

 
$
—

Obligations of states and political subdivisions
6

 
—

 
—

 
—

Residential mortgage-backed securities and collateralized mortgage obligations
634

 
433

 
902

 
—

 
$
653

 
$
433

 
$
902

 
$
—

 
 
 
 
 
 
 
 
 
Nine Months Ended
 
September 30, 2015
 
September 30, 2014
 
Gains
 
Losses
 
Gains
 
Losses
U.S. Treasury and agencies
$
13

 
$
—

 
$
—

 
$
—

Obligations of states and political subdivisions
6

 
—

 
3

 
1

Residential mortgage-backed securities and collateralized mortgage obligations
1,177

 
841

 
1,876

 
—

 
$
1,196

 
$
841

 
$
1,879

 
$
1
Investment Securities Pledged To Secure Borrowings And Public Deposits
The following table presents, as of September 30, 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
$
825

 
$
850

To state and local governments to secure public deposits
1,633,090

 
1,651,026

Other securities pledged principally to secure repurchase agreements
508,903

 
511,231

Total pledged securities
$
2,142,818

 
$
2,163,107