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Investment Securities (Tables)
 6 Months Ended
Jun. 30, 2017
Investments, Debt and Equity Securities [Abstract]  
Amortized Cost, Unrealized Gains And Losses, And Fair Value Of Investment Securities
The following tables present the amortized costs, unrealized gains, unrealized losses and approximate fair values of investment securities at June 30, 2017 and December 31, 2016: 

 (in thousands)
June 30, 2017
 
Amortized
 
Unrealized
 
Unrealized
 
Fair
 
Cost
 
Gains
 
Losses
 
Value
AVAILABLE FOR SALE:
 

 
 

 
 

 
 

Obligations of states and political subdivisions
$
292,528

 
$
7,091

 
$
(1,059
)
 
$
298,560

Residential mortgage-backed securities and collateralized mortgage obligations
2,854,484

 
5,177

 
(27,636
)
 
2,832,025

Investments in mutual funds and other equity securities
1,959

 
22

 
—

 
1,981

 
$
3,148,971

 
$
12,290

 
$
(28,695
)
 
$
3,132,566

HELD TO MATURITY:
 
 
 
 
 
 
 
Residential mortgage-backed securities and collateralized mortgage obligations
$
4,017

 
$
1,054

 
$
—

 
$
5,071

 
$
4,017

 
$
1,054

 
$
—

 
$
5,071


 (in thousands)
December 31, 2016
 
Amortized
 
Unrealized
 
Unrealized
 
Fair
 
Cost
 
Gains
 
Losses
 
Value
AVAILABLE FOR SALE:
 
 
 
 
 
 
 
Obligations of states and political subdivisions
$
305,708

 
$
5,526

 
$
(3,537
)
 
$
307,697

Residential mortgage-backed securities and collateralized mortgage obligations
2,428,387

 
3,664

 
(40,498
)
 
2,391,553

Investments in mutual funds and other equity securities
1,959

 
11

 
—

 
1,970

 
$
2,736,054

 
$
9,201

 
$
(44,035
)
 
$
2,701,220

HELD TO MATURITY:
 
 
 
 
 
 
 
Residential mortgage-backed securities and collateralized mortgage obligations
$
4,216

 
$
1,001

 
$
—

 
$
5,217

 
$
4,216

 
$
1,001

 
$
—

 
$
5,217
Schedule Of Fair Value And Unrealized Losses Of Securities
June 30, 2017
 
 
 
 
 
 
 
 
 
 
 
 (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
$
32,681

 
$
816

 
$
6,187

 
$
243

 
$
38,868

 
$
1,059

Residential mortgage-backed securities and collateralized mortgage obligations
1,847,048

 
23,754

 
217,245

 
3,882

 
2,064,293

 
27,636

Total temporarily impaired securities
$
1,879,729

 
$
24,570

 
$
223,432

 
$
4,125

 
$
2,103,161

 
$
28,695


December 31, 2016
 
 
 
 
 
 
 
 
 
 
 
 (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
$
71,571

 
$
3,065

 
$
1,828

 
$
472

 
$
73,399

 
$
3,537

Residential mortgage-backed securities and collateralized mortgage obligations
1,855,304

 
35,981

 
182,804

 
4,517

 
2,038,108

 
40,498

Total temporarily impaired securities
$
1,926,875

 
$
39,046

 
$
184,632

 
$
4,989

 
$
2,111,507

 
$
44,035
Schedule Of Maturities Of Investment Securities
The following table presents the maturities of investment securities at June 30, 2017: 
 
 (in thousands)
Available For Sale
 
Held To Maturity
 
Amortized
 
Fair
 
Amortized
 
Fair
 
Cost
 
Value
 
Cost
 
Value
AMOUNTS MATURING IN:
 
 
 
 
 
 
 
Three months or less
$
722

 
$
724

 
$
—

 
$
—

Over three months through twelve months
1,272

 
1,281

 
—

 
—

After one year through five years
58,973

 
59,861

 
—

 
—

After five years through ten years
406,007

 
409,846

 
19

 
20

After ten years
2,680,038

 
2,658,873

 
3,998

 
5,051

Other investment securities
1,959

 
1,981

 
—

 
—

 
$
3,148,971

 
$
3,132,566

 
$
4,017

 
$
5,071
Gross Realized Gains And Losses On Sales Of Available-For-Sale Securities
The following tables present the gross realized gains and losses on the sale of securities available for sale for the three and six months ended June 30, 2017 and 2016:

(in thousands)
Three Months Ended
 
June 30, 2017
 
June 30, 2016
 
Gains
 
Losses
 
Gains
 
Losses
Obligations of states and political subdivisions
$
—

 
$
1

 
$
275

 
$
—

Residential mortgage-backed securities and collateralized mortgage obligations
135

 
99

 
270

 
383

 
$
135

 
$
100

 
$
545

 
$
383

 
 
 
 
 
 
 
 
 
Six Months Ended
 
June 30, 2017
 
June 30, 2016
 
Gains
 
Losses
 
Gains
 
Losses
Obligations of states and political subdivisions
$
—

 
$
3

 
$
971

 
$
—

Residential mortgage-backed securities and collateralized mortgage obligations
135

 
99

 
270

 
383

 
$
135

 
$
102

 
$
1,241

 
$
383
Investment Securities Pledged To Secure Borrowings And Public Deposits
The following table presents, as of June 30, 2017, 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 the Federal Home Loan Bank to secure borrowings
$
502

 
$
511

To state and local governments to secure public deposits
931,950

 
932,534

Other securities pledged principally to secure repurchase agreements
423,380

 
420,042

Total pledged securities
$
1,355,832

 
$
1,353,087