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Investment Securities (Tables)
 12 Months Ended
Dec. 31, 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 December 31, 2014 and 2013: 

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


December 31, 2013
(in thousands)
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
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


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 December 31, 2014: 
(in thousands)
Available For Sale
 
Held To Maturity
 
Amortized
 
Fair
 
Amortized
 
Fair
 
Cost
 
Value
 
Cost
 
Value
AMOUNTS MATURING IN:
 
 
 
 
 
 
 
Three months or less
$
8,077

 
$
8,118

 
$
—

 
$
—

Over three months through twelve months
63,008

 
63,755

 
138

 
200

After one year through five years
1,620,464

 
1,639,949

 
427

 
655

After five years through ten years
514,770

 
511,260

 
271

 
298

After ten years
70,597

 
73,403

 
4,252

 
4,278

Other investment securities
2,016

 
2,070

 
123

 
123

 
$
2,278,932

 
$
2,298,555

 
$
5,211

 
$
5,554
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, 2014, 2013 and 2012: 
(in thousands)
2014
 
2013
 
2012
 
Gains
 
Losses
 
Gains
 
Losses
 
Gains
 
Losses
U.S. Treasury and agencies
$
—

 
$
—

 
$
—

 
$
—

 
$
371

 
$
—

Obligations of states and political subdivisions
3

 
1

 
10

 
1

 
10

 
1

Residential mortgage-backed securities and
 
 
 
 
 
 
 
 
 
 
 
collateralized mortgage obligations
2,902

 
—

 
—

 
—

 
4,578

 
953

Other debt securities
—

 
—

 
200

 
—

 
18

 
—

 
$
2,905

 
$
1

 
$
210

 
$
1

 
$
4,977

 
$
954
Investment Securities Pledged To Secure Borrowings And Public Deposits
The following table presents, as of December 31, 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
$
2,109

 
$
2,183

To state and local governments to secure public deposits
1,693,153

 
1,706,717

Other securities pledged principally to secure repurchase agreements
474,380

 
475,430

Total pledged securities
$
2,169,642

 
$
2,184,330