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Investments (Tables)
 12 Months Ended
Dec. 31, 2018
Investments [Abstract]  
Aggregate Values And Unrealized Gains And Losses Of Investment Securities
The amortized cost and fair value of investment securities classified as available for sale and held to maturity at December 31, 2018 and 2017, were as follows:
 
December 31, 2018
(Dollars in thousands)
Cost
 
Gross
unrealized
gains
 
Gross unrealized
losses
 
Fair
value
Investment securities available for sale
 
 
 
 
 
 
 
U.S. Treasury
$
1,249,243

 
$
633

 
$
2,166

 
$
1,247,710

Government agency
257,252

 
222

 
639

 
256,835

Mortgage-backed securities
2,956,793

 
5,309

 
52,763

 
2,909,339

Corporate bonds
139,906

 
59

 
864

 
139,101

Other
3,923

 
202

 
—

 
4,125

Total investment securities available for sale
$
4,607,117

 
$
6,425

 
$
56,432

 
$
4,557,110

 
 
 
 
 
 
 
 
 
December 31, 2017
 
Cost
 
Gross
unrealized gains
 
Gross unrealized
losses
 
Fair
value
U.S. Treasury
$
1,658,410

 
$
—

 
$
546

 
$
1,657,864

Government agency
8,695

 
15

 
40

 
8,670

Mortgage-backed securities
5,419,379

 
1,529

 
80,152

 
5,340,756

Marketable equity securities
75,471

 
29,737

 
—

 
105,208

Corporate bonds
59,414

 
557

 
8

 
59,963

Other
7,645

 
256

 
182

 
7,719

Total investment securities available for sale
$
7,229,014

 
$
32,094

 
$
80,928

 
$
7,180,180

 
 
 
 
 
 
 
 
 
December 31, 2018
 
Cost
 
Gross
unrealized
gains
 
Gross unrealized
losses
 
Fair
value
Investment securities held to maturity
 
 
 
 
 
 
 
Mortgage-backed securities
$
2,184,653

 
$
17,339

 
$
490

 
$
2,201,502

 
 
 
 
 
 
 
 
 
December 31, 2017
 
Cost
 
Gross
unrealized
gains
 
Gross unrealized
losses
 
Fair
value
Mortgage-backed securities
$
76

 
$
5

 
$
—

 
$
81
Investment Securities Maturity Information
The following table provides the amortized cost and fair value by contractual maturity. Expected maturities will differ from contractual maturities on certain securities because borrowers and issuers may have the right to call or prepay obligations with or without prepayment penalties. Mortgage-backed, government agency and equity securities are stated separately as they are not due at a single maturity date.
 
December 31, 2018
 
December 31, 2017
(Dollars in thousands)
Cost
 
Fair value
 
Cost
 
Fair value
Investment securities available for sale
 
 
 
 
 
 
 
Non-amortizing securities maturing in:
 
 
 
 
 
 
 
One year or less
$
1,049,253

 
$
1,047,380

 
$
808,768

 
$
808,301

One through five years
205,526

 
205,805

 
849,642

 
849,563

Five through 10 years
134,370

 
133,626

 
59,414

 
59,963

Over 10 years
3,923

 
4,125

 
7,645

 
7,719

Government agency
257,252

 
256,835

 
8,695

 
8,670

Mortgage-backed securities
2,956,793

 
2,909,339

 
5,419,379

 
5,340,756

Marketable equity securities
—

 
—

 
75,471

 
105,208

Total investment securities available for sale
$
4,607,117

 
$
4,557,110

 
$
7,229,014

 
$
7,180,180

Investment securities held to maturity
 
 
 
 
 
 
 
Mortgage-backed securities held to maturity
$
2,184,653

 
$
2,201,502

 
$
76

 
$
81
Securities Gains (Losses)
For each period presented, securities gains (losses) include the following:
 
Year ended December 31
(Dollars in thousands)
2018
 
2017
 
2016
Gross gains on retirement/sales of investment securities available for sale
$
353

 
$
11,635

 
$
27,104

Gross losses on sales of investment securities available for sale
(2
)
 
(7,342
)
 
(431
)
Net securities gains
$
351

 
$
4,293

 
$
26,673
Schedule of Realized and Unrealized Gains or Losses on Marketable Equity Securities
The following table provides the realized and unrealized gains or losses on marketable equity securities for the three and twelve months ended December 31, 2018.
(Dollars in thousands)
Three months ended December 31, 2018
 
Twelve months ended December 31, 2018
Marketable equity securities (losses) gains, net
$
(16,875
)
 
$
(7,610
)
Less net gains recognized on marketable equity securities sold
9

 
1,190

Unrealized (losses) gains recognized on marketable equity securities held
$
(16,884
)
 
$
(8,800
)
Investment Securities With Unrealized Losses
The following table provides information regarding securities with unrealized losses as of December 31, 2018 and 2017:
 
December 31, 2018
 
Less than 12 months
 
12 months or more
 
Total
(Dollars in thousands)
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
Investment securities available for sale:
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury
$
248,983

 
$
113

 
$
848,622

 
$
2,053

 
$
1,097,605

 
$
2,166

Government agency
115,273

 
601

 
2,310

 
38

 
117,583

 
639

Mortgage-backed securities
262,204

 
2,387

 
1,940,695

 
50,376

 
2,202,899

 
52,763

Corporate bonds
79,066

 
842

 
5,000

 
22

 
84,066

 
864

Total
$
705,526

 
$
3,943

 
$
2,796,627

 
$
52,489

 
$
3,502,153

 
$
56,432

Investment securities held to maturity:
 
 
 
 
 
 
 
 
 
 
 
Mortgage-backed securities
$
5,111

 
$
181

 
$
10,131

 
$
309

 
$
15,242

 
$
490

 
 
 
 
 
 
 
 
 
 
 
 
 
December 31, 2017
 
Less than 12 months
 
12 months or more
 
Total
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
Investment securities available for sale:
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury
$
1,408,166

 
$
345

 
$
249,698

 
$
201

 
$
1,657,864

 
$
546

Government agency
848

 
12

 
2,527

 
28

 
3,375

 
40

Mortgage-backed securities
2,333,254

 
20,911

 
2,723,406

 
59,241

 
5,056,660

 
80,152

Corporate bonds
5,025

 
8

 
—

 
—

 
5,025

 
8

Other
5,349

 
182

 
—

 
—

 
5,349

 
182

Total
$
3,752,642

 
$
21,458

 
$
2,975,631

 
$
59,470

 
$
6,728,273

 
$
80,928