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Investment Securities (Tables)
 12 Months Ended
Dec. 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 December 31, 2015 and 2014: 

December 31, 2015
(in thousands)
Amortized
 
Unrealized
 
Unrealized
 
Fair
 
Cost
 
Gains
 
Losses
 
Value
AVAILABLE FOR SALE:
 
 
 
 
 
 
 
Obligations of states and political subdivisions
$
300,998

 
$
12,741

 
$
(622
)
 
$
313,117

Residential mortgage-backed securities and collateralized mortgage obligations
2,223,742

 
7,218

 
(23,540
)
 
2,207,420

Investments in mutual funds and other equity securities
1,959

 
43

 
—

 
2,002

 
$
2,526,699

 
$
20,002

 
$
(24,162
)
 
$
2,522,539

HELD TO MATURITY:
 
 
 
 
 
 
 
Residential mortgage-backed securities and collateralized mortgage obligations
$
4,609

 
$
981

 
$
—

 
$
5,590

 
$
4,609

 
$
981

 
$
—

 
$
5,590


December 31, 2014
(in thousands)
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
December 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
$
2,530

 
$
83

 
$
8,208

 
$
539

 
$
10,738

 
$
622

Residential mortgage-backed securities and collateralized mortgage obligations
1,256,994

 
14,465

 
334,981

 
9,075

 
1,591,975

 
23,540

Total temporarily impaired securities
$
1,259,524

 
$
14,548

 
$
343,189

 
$
9,614

 
$
1,602,713

 
$
24,162


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 December 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
$
4,648

 
$
4,673

 
$
—

 
$
—

Over three months through twelve months
72,886

 
73,615

 
6

 
8

After one year through five years
1,646,982

 
1,648,510

 
257

 
760

After five years through ten years
602,427

 
595,462

 
332

 
808

After ten years
197,797

 
198,277

 
4,014

 
4,014

Other investment securities
1,959

 
2,002

 
—

 
—

 
$
2,526,699

 
$
2,522,539

 
$
4,609

 
$
5,590
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 years ended December 31, 2015, 2014 and 2013: 
(in thousands)
2015
 
2014
 
2013
 
Gains
 
Losses
 
Gains
 
Losses
 
Gains
 
Losses
U.S. Treasury and agencies
$
13

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

Obligations of states and political subdivisions
631

 
—

 
3

 
1

 
10

 
1

Residential mortgage-backed securities and collateralized mortgage obligations
3,119

 
841

 
2,902

 
—

 
—

 
—

Other debt securities
—

 
—

 
—

 
—

 
200

 
—

 
$
3,763

 
$
841

 
$
2,905

 
$
1

 
$
210

 
$
1
Investment Securities Pledged To Secure Borrowings And Public Deposits
The following table presents, as of December 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
$
816

 
$
834

To state and local governments to secure public deposits
1,719,779

 
1,719,098

Other securities pledged principally to secure repurchase agreements
470,883

 
467,936

Total pledged securities
$
2,191,478

 
$
2,187,868