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Investment Securities (Tables)
 9 Months Ended
Sep. 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 September 30, 2017 and December 31, 2016: 

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

 
 

 
 

 
 

U.S. Treasury and agencies
$
40,026

 
$
—

 
$
—

 
$
40,026

Obligations of states and political subdivisions
291,908

 
6,775

 
(889
)
 
297,794

Residential mortgage-backed securities and collateralized mortgage obligations
2,725,745

 
5,499

 
(23,689
)
 
2,707,555

Investments in mutual funds and other equity securities
1,959

 
24

 
—

 
1,983

 
$
3,059,638

 
$
12,298

 
$
(24,578
)
 
$
3,047,358

HELD TO MATURITY:
 
 
 
 
 
 
 
Residential mortgage-backed securities and collateralized mortgage obligations
$
3,905

 
$
1,114

 
$
—

 
$
5,019

 
$
3,905

 
$
1,114

 
$
—

 
$
5,019


 (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
Investment securities that were in an unrealized loss position as of September 30, 2017 and December 31, 2016 are presented in the following tables, based on the length of time individual securities have been in an unrealized loss position.
 
September 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
$
13,108

 
$
147

 
$
25,256

 
$
742

 
$
38,364

 
$
889

Residential mortgage-backed securities and collateralized mortgage obligations
1,169,351

 
10,792

 
667,296

 
12,897

 
1,836,647

 
23,689

Total temporarily impaired securities
$
1,182,459

 
$
10,939

 
$
692,552

 
$
13,639

 
$
1,875,011

 
$
24,578


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 September 30, 2017: 
 
 (in thousands)
Available For Sale
 
Held To Maturity
 
Amortized
 
Fair
 
Amortized
 
Fair
 
Cost
 
Value
 
Cost
 
Value
AMOUNTS MATURING IN:
 
 
 
 
 
 
 
Due within one year
$
1,786

 
$
1,791

 
$
—

 
$
—

Due after one year through five years
101,898

 
102,915

 
—

 
—

Due after five years through ten years
416,627

 
419,502

 
18

 
19

Due after ten years
2,537,368

 
2,521,167

 
3,887

 
5,000

Other investment securities
1,959

 
1,983

 
—

 
—

 
$
3,059,638

 
$
3,047,358

 
$
3,905

 
$
5,019
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 nine months ended September 30, 2017 and 2016:

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

 
$
6

 
$
—

 
$
—

 
$
—

 
$
6

 
$
—

 
$
—

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

 
$
9

 
$
971

 
$
—

Residential mortgage-backed securities and collateralized mortgage obligations
135

 
99

 
270

 
383

 
$
135

 
$
108

 
$
1,241

 
$
383
Investment Securities Pledged To Secure Borrowings And Public Deposits
The following table presents, as of September 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
$
458

 
$
467

To state and local governments to secure public deposits
926,917

 
927,182

Other securities pledged principally to secure repurchase agreements
426,540

 
423,854

Total pledged securities
$
1,353,915

 
$
1,351,503