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Investment Securities (Tables)
 12 Months Ended
Dec. 31, 2013
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, 2013 and 2012: 

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


December 31, 2012
(in thousands)
 
Amortized
 
Unrealized
 
Unrealized
 
Fair
 
Cost
 
Gains
 
Losses
 
Value
AVAILABLE FOR SALE:
 
 
 
 
 
 
 
U.S. Treasury and agencies
$
45,503

 
$
318

 
$
(1
)
 
$
45,820

Obligations of states and political subdivisions
245,606

 
18,119

 
—

 
263,725

Residential mortgage-backed securities and
 
 
 
 
 
 
 
collateralized mortgage obligations
2,291,253

 
28,747

 
(6,624
)
 
2,313,376

Other debt securities
143

 
79

 
—

 
222

Investments in mutual funds and
 
 
 
 
 
 
 
other equity securities
1,959

 
127

 
—

 
2,086

 
$
2,584,464

 
$
47,390

 
$
(6,625
)
 
$
2,625,229

HELD TO MATURITY:
 
 
 
 
 
 
 
Obligations of states and political subdivisions
$
595

 
$
1

 
$
—

 
$
596

Residential mortgage-backed securities and
 
 
 
 
 
 
 
collateralized mortgage obligations
3,946

 
197

 
(7
)
 
4,136

 
$
4,541

 
$
198

 
$
(7
)
 
$
4,732
Schedule Of Fair Value And Unrealized Losses Of Securities
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


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, 2012
(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
$
—

 
$
—

 
$
59

 
$
1

 
$
59

 
$
1

Residential mortgage-backed securities and
 
 
 
 
 
 
 
 
 
 
 
collateralized mortgage obligations
780,234

 
5,548

 
106,096

 
1,076

 
886,330

 
6,624

Total temporarily impaired securities
$
780,234

 
$
5,548

 
$
106,155

 
$
1,077

 
$
886,389

 
$
6,625

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

 
$
—

 
$
48

 
$
7

 
$
48

 
$
7

Total temporarily impaired securities
$
—

 
$
—

 
$
48

 
$
7

 
$
48

 
$
7
Schedule Of Maturities Of Investment Securities
The following table presents the maturities of investment securities at December 31, 2013: 
 
(in thousands)
 
Available For Sale
 
Held To Maturity
 
Amortized
 
Fair
 
Amortized
 
Fair
 
Cost
 
Value
 
Cost
 
Value
AMOUNTS MATURING IN:
 
 
 
 
 
 
 
Three months or less
$
15,169

 
$
15,204

 
$
—

 
$
—

Over three months through twelve months
100,712

 
102,426

 
357

 
407

After one year through five years
1,055,812

 
1,067,340

 
728

 
983

After five years through ten years
554,722

 
534,083

 
44

 
49

After ten years
70,804

 
69,961

 
4,434

 
4,435

Other investment securities
1,959

 
1,964

 
—

 
—

 
$
1,799,178

 
$
1,790,978

 
$
5,563

 
$
5,874
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, 2013, 2012 and 2011: 
 
(in thousands)
 
2013
 
2012
 
2011
 
Gains
 
Losses
 
Gains
 
Losses
 
Gains
 
Losses
U.S. Treasury and agencies
$
—

 
$
—

 
$
371

 
$
—

 
$
—

 
$
—

Obligations of states and political subdivisions
10

 
1

 
10

 
1

 
8

 
—

Residential mortgage-backed securities and
 
 
 
 
 
 
 
 
 
 
 
collateralized mortgage obligations
—

 
—

 
4,578

 
953

 
8,544

 
817

Other debt securities
200

 
—

 
18

 
—

 
—

 
—

 
$
210

 
$
1

 
$
4,977

 
$
954

 
$
8,552

 
$
817
Investment Securities Pledged To Secure Borrowings And Public Deposits
The following table presents, as of December 31, 2013, 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
$
11,303

 
$
11,689

To state and local governments to secure public deposits
833,068

 
824,737

Other securities pledged principally to secure repurchase agreements
324,253

 
318,708

Total pledged securities
$
1,168,624

 
$
1,155,134