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Investment Securities (Tables)
 12 Months Ended
Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]  
Schedule of investment securities available-for-sale
The following table shows investment securities available-for-sale.
(Dollars in thousands)
 
Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Fair Value
December 31, 2017
 
 

 
 

 
 

 
 

U.S. Treasury and Federal agencies securities
 
$
471,508

 
$
57

 
$
(3,446
)
 
$
468,119

U.S. States and political subdivisions securities
 
116,260

 
648

 
(908
)
 
116,000

Mortgage-backed securities - Federal agencies
 
289,327

 
1,456

 
(2,873
)
 
287,910

Corporate debt securities
 
31,573

 
5

 
(284
)
 
31,294

Foreign government and other securities
 
700

 
10

 
—

 
710

Total investment securities available-for-sale
 
$
909,368

 
$
2,176

 
$
(7,511
)
 
$
904,033

December 31, 2016
 
 

 
 

 
 

 
 

U.S. Treasury and Federal agencies securities
 
$
424,495

 
$
809

 
$
(4,471
)
 
$
420,833

U.S. States and political subdivisions securities
 
133,509

 
1,036

 
(1,570
)
 
132,975

Mortgage-backed securities - Federal agencies
 
252,981

 
2,175

 
(2,582
)
 
252,574

Corporate debt securities
 
35,266

 
111

 
(301
)
 
35,076

Foreign government and other securities
 
800

 
7

 
—

 
807

Total debt securities
 
847,051

 
4,138

 
(8,924
)
 
842,265

Marketable equity securities
 
1,265

 
7,007

 
(70
)
 
8,202

Total investment securities available-for-sale
 
$
848,316

 
$
11,145

 
$
(8,994
)
 
$
850,467
Schedule of contractual maturities of debt securities available-for-sale
The following table shows the contractual maturities of investments in debt securities available-for-sale at December 31, 2017. Expected maturities will differ from contractual maturities, because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.
(Dollars in thousands)
 
Amortized Cost
 
Fair Value
Due in one year or less
 
$
94,929

 
$
95,016

Due after one year through five years
 
493,262

 
489,615

Due after five years through ten years
 
31,850

 
31,492

Due after ten years
 
—

 
—

Mortgage-backed securities
 
289,327

 
287,910

Total debt securities available-for-sale
 
$
909,368

 
$
904,033
Schedule of gross unrealized losses and fair value by investment category and age
The following table summarizes gross unrealized losses and fair value by investment category and age.
 
 
Less than 12 Months
 
12 months or Longer
 
Total
(Dollars in thousands) 
 
Fair Value
 
Unrealized Losses
 
Fair Value
 
Unrealized Losses
 
Fair Value
 
Unrealized Losses
December 31, 2017
 
 

 
 

 
 

 
 

 
 

 
 

U.S. Treasury and Federal agencies securities
 
$
311,865

 
$
(1,161
)
 
$
89,617

 
$
(2,285
)
 
$
401,482

 
$
(3,446
)
U.S. States and political subdivisions securities
 
34,971

 
(287
)
 
24,909

 
(621
)
 
59,880

 
(908
)
Mortgage-backed securities - Federal agencies
 
137,169

 
(1,336
)
 
60,162

 
(1,537
)
 
197,331

 
(2,873
)
Corporate debt securities
 
13,747

 
(57
)
 
10,048

 
(227
)
 
23,795

 
(284
)
Foreign government and other securities
 
—

 
—

 
—

 
—

 
—

 
—

Total temporarily impaired available-for-sale securities
 
$
497,752

 
$
(2,841
)
 
$
184,736

 
$
(4,670
)
 
$
682,488

 
$
(7,511
)
December 31, 2016
 
 

 
 

 
 

 
 

 
 

 
 

U.S. Treasury and Federal agencies securities
 
$
263,680

 
$
(4,471
)
 
$
—

 
$
—

 
$
263,680

 
$
(4,471
)
U.S. States and political subdivisions securities
 
74,129

 
(1,515
)
 
3,337

 
(55
)
 
77,466

 
(1,570
)
Mortgage-backed securities - Federal agencies
 
168,554

 
(2,341
)
 
5,102

 
(241
)
 
173,656

 
(2,582
)
Corporate debt securities
 
13,312

 
(301
)
 
—

 
—

 
13,312

 
(301
)
Foreign government and other securities
 
—

 
—

 
—

 
—

 
—

 
—

Total debt securities
 
519,675

 
(8,628
)
 
8,439

 
(296
)
 
528,114

 
(8,924
)
Marketable equity securities
 
280

 
(70
)
 
4

 
—

 
284

 
(70
)
Total temporarily impaired available-for-sale securities
 
$
519,955

 
$
(8,698
)
 
$
8,443

 
$
(296
)
 
$
528,398

 
$
(8,994
)
Schedule of gross realized gains and losses from the securities available-for-sale portfolio, including marketable equity securities
The following table shows the gross realized gains and losses from the securities available-for-sale portfolio, including marketable equity securities.
(Dollars in thousands)
 
2017
 
2016
 
2015
Gross realized gains
 
$
7,425

 
$
2,090

 
$
4

Gross realized losses
 
(2,895
)
 
—

 
—

OTTI losses
 
(190
)
 
(294
)
 
—

Net realized gains
 
$
4,340

 
$
1,796

 
$
4