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Investment Securities (Tables)
 3 Months Ended
Mar. 31, 2018
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 March 31, 2018 and December 31, 2017: 
 (in thousands)
March 31, 2018
 
Amortized Cost
 
Unrealized Gains
 
Unrealized Losses
 
Fair Value
AVAILABLE FOR SALE:
 

 
 

 
 

 
 

U.S. Treasury and agencies
$
40,017

 
$
—

 
$
(499
)
 
$
39,518

Obligations of states and political subdivisions
299,855

 
3,295

 
(3,599
)
 
299,551

Residential mortgage-backed securities and collateralized mortgage obligations
2,682,266

 
956

 
(74,877
)
 
2,608,345

 
$
3,022,138

 
$
4,251

 
$
(78,975
)
 
$
2,947,414

HELD TO MATURITY:
 
 
 
 
 
 
 
Residential mortgage-backed securities and collateralized mortgage obligations
$
3,667

 
$
1,002

 
$
—

 
$
4,669

 
$
3,667

 
$
1,002

 
$
—

 
$
4,669


 (in thousands)
December 31, 2017
 
Amortized Cost
 
Unrealized Gains
 
Unrealized Losses
 
Fair Value
AVAILABLE FOR SALE:
 
 
 
 
 
 
 
U.S. Treasury and agencies
$
40,021

 
$
—

 
$
(323
)
 
$
39,698

Obligations of states and political subdivisions
303,352

 
6,206

 
(1,102
)
 
308,456

Residential mortgage-backed securities and collateralized mortgage obligations
2,703,997

 
2,039

 
(40,391
)
 
2,665,645

Investments in mutual funds and other securities
51,959

 
11

 
—

 
51,970

 
$
3,099,329

 
$
8,256

 
$
(41,816
)
 
$
3,065,769

HELD TO MATURITY:
 
 
 
 
 
 
 
Residential mortgage-backed securities and collateralized mortgage obligations
$
3,803

 
$
1,103

 
$
—

 
$
4,906

 
$
3,803

 
$
1,103

 
$
—

 
$
4,906
Schedule Of Fair Value And Unrealized Losses Of Securities
Investment securities that were in an unrealized loss position as of March 31, 2018 and December 31, 2017 are presented in the following tables, based on the length of time individual securities have been in an unrealized loss position.
March 31, 2018
 
 
 
 
 
 
 
 
 
 
 
 (in thousands)
Less than 12 Months
 
12 Months or Longer
 
Total
 
Fair Value
 
Unrealized Losses
 
Fair Value
 
Unrealized Losses
 
Fair Value
 
Unrealized Losses
AVAILABLE FOR SALE:
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury and agencies
$
39,518

 
$
499

 
$
—

 
$
—

 
$
39,518

 
$
499

Obligations of states and political subdivisions
92,400

 
2,058

 
24,496

 
1,541

 
116,896

 
3,599

Residential mortgage-backed securities and collateralized mortgage obligations
1,309,122

 
27,267

 
1,209,663

 
47,610

 
2,518,785

 
74,877

Total temporarily impaired securities
$
1,441,040

 
$
29,824

 
$
1,234,159

 
$
49,151

 
$
2,675,199

 
$
78,975


December 31, 2017
 
 
 
 
 
 
 
 
 
 
 
 (in thousands)
Less than 12 Months
 
12 Months or Longer
 
Total
 
Fair Value
 
Unrealized Losses
 
Fair Value
 
Unrealized Losses
 
Fair Value
 
Unrealized Losses
AVAILABLE FOR SALE:
 

 
 

 
 

 
 

 
 

 
 

U.S. Treasury and agencies
$
39,699

 
$
323

 
$
—

 
$
—

 
$
39,699

 
$
323

Obligations of states and political subdivisions
20,566

 
322

 
24,798

 
780

 
45,364

 
1,102

Residential mortgage-backed securities and collateralized mortgage obligations
1,184,000

 
10,368

 
1,226,364

 
30,023

 
2,410,364

 
40,391

Total temporarily impaired securities
$
1,244,265

 
$
11,013

 
$
1,251,162

 
$
30,803

 
$
2,495,427

 
$
41,816
Schedule Of Maturities Of Investment Securities
The following table presents the contractual maturities of investment securities at March 31, 2018:  
 (in thousands)
Available For Sale
 
Held To Maturity
 
Amortized Cost
 
Fair Value
 
Amortized Cost
 
Fair Value
AMOUNTS MATURING IN:
 
 
 
 
 
 
 
Due within one year
$
22,399

 
$
22,267

 
$
—

 
$
—

Due after one year through five years
73,780

 
73,824

 
—

 
—

Due after five years through ten years
435,437

 
429,274

 
18

 
19

Due after ten years
2,490,522

 
2,422,049

 
3,649

 
4,650

 
$
3,022,138

 
$
2,947,414

 
$
3,667

 
$
4,669
Investment Securities Pledged To Secure Borrowings And Public Deposits
The following table presents, as of March 31, 2018, investment securities which were pledged to secure borrowings, public deposits, and repurchase agreements as permitted or required by law: 
 (in thousands)
Amortized Cost
 
Fair Value
To the Federal Home Loan Bank to secure borrowings
$
449

 
$
448

To state and local governments to secure public deposits
904,227

 
887,820

Other securities pledged principally to secure repurchase agreements
435,384

 
422,762

Total pledged securities
$
1,340,060

 
$
1,311,030