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Investment Securities (Tables)
 9 Months Ended
Sep. 30, 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
September 30, 2017
 
 

 
 

 
 

 
 

U.S. Treasury and Federal agencies securities
 
$
460,282

 
$
453

 
$
(3,109
)
 
$
457,626

U.S. States and political subdivisions securities
 
122,178

 
1,407

 
(459
)
 
123,126

Mortgage-backed securities — Federal agencies
 
276,791

 
1,989

 
(1,923
)
 
276,857

Corporate debt securities
 
31,599

 
48

 
(168
)
 
31,479

Foreign government and other securities
 
200

 
2

 
—

 
202

Total debt securities
 
891,050

 
3,899

 
(5,659
)
 
889,290

Marketable equity securities
 
598

 
4,098

 
(13
)
 
4,683

Total investment securities available-for-sale
 
$
891,648

 
$
7,997

 
$
(5,672
)
 
$
893,973

 
 
 
 
 
 
 
 
 
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 investments in debt securities available-for-sale
The following table shows the contractual maturities of investments in debt securities available-for-sale at September 30, 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
 
$
119,304

 
$
119,624

Due after one year through five years
 
448,884

 
446,985

Due after five years through ten years
 
46,071

 
45,824

Due after ten years
 
—

 
—

Mortgage-backed securities
 
276,791

 
276,857

Total debt securities available-for-sale
 
$
891,050

 
$
889,290
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
September 30, 2017
 
 

 
 

 
 

 
 

 
 

 
 

U.S. Treasury and Federal agencies securities
 
$
238,505

 
$
(1,482
)
 
$
97,156

 
$
(1,627
)
 
$
335,661

 
$
(3,109
)
U.S. States and political subdivisions securities
 
17,119

 
(107
)
 
22,213

 
(352
)
 
39,332

 
(459
)
Mortgage-backed securities - Federal agencies
 
108,863

 
(1,043
)
 
59,233

 
(880
)
 
168,096

 
(1,923
)
Corporate debt securities
 
9,789

 
(13
)
 
8,134

 
(155
)
 
17,923

 
(168
)
Foreign government and other securities
 
—

 
—

 
—

 
—

 
—

 
—

Total debt securities
 
374,276

 
(2,645
)
 
186,736

 
(3,014
)
 
561,012

 
(5,659
)
Marketable equity securities
 
149

 
(12
)
 
3

 
(1
)
 
152

 
(13
)
Total investment securities available-for-sale
 
$
374,425

 
$
(2,657
)
 
$
186,739

 
$
(3,015
)
 
$
561,164

 
$
(5,672
)
 
 
 
 
 
 
 
 
 
 
 
 
 
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 investment securities available-for-sale
 
$
519,955

 
$
(8,698
)
 
$
8,443

 
$
(296
)
 
$
528,398

 
$
(8,994
)
Schedule of gross realized gains and losses from securities available-for-sale portfolio
The following table shows the gross realized gains and losses from the securities available-for-sale portfolio, including marketable equity securities. Realized gains and losses of all securities are computed using the specific identification cost basis.
 
 
Three Months Ended 
 September 30,
 
Nine Months Ended 
 September 30,
(Dollars in thousands)
 
2017
 
2016
 
2017
 
2016
Gross realized gains
 
$
1,007

 
$
989

 
$
2,947

 
$
1,084

Gross realized losses
 
—

 
—

 
—

 
—

OTTI losses
 
—

 
—

 
(190
)
 
(294
)
Net realized gains (losses)
 
$
1,007

 
$
989

 
$
2,757

 
$
790