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Investment Securities (Tables)
 9 Months Ended
Sep. 30, 2014
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, 2014
 
 

 
 

 
 

 
 

U.S. Treasury and Federal agencies securities
 
$
392,578

 
$
3,793

 
$
(2,472
)
 
$
393,899

U.S. States and political subdivisions securities
 
123,152

 
4,012

 
(149
)
 
127,015

Mortgage-backed securities — Federal agencies
 
249,710

 
5,337

 
(1,586
)
 
253,461

Corporate debt securities
 
31,729

 
285

 
(35
)
 
31,979

Foreign government and other securities
 
800

 
8

 
—

 
808

Total debt securities
 
797,969

 
13,435

 
(4,242
)
 
807,162

Marketable equity securities
 
1,893

 
4,651

 
(2
)
 
6,542

Total investment securities available-for-sale
 
$
799,862

 
$
18,086

 
$
(4,244
)
 
$
813,704

 
 
 
 
 
 
 
 
 
December 31, 2013
 
 

 
 

 
 

 
 

U.S. Treasury and Federal agencies securities
 
$
394,558

 
$
5,008

 
$
(4,527
)
 
$
395,039

U.S. States and political subdivisions securities
 
120,416

 
3,670

 
(847
)
 
123,239

Mortgage-backed securities — Federal agencies
 
273,495

 
5,148

 
(3,563
)
 
275,080

Corporate debt securities
 
30,828

 
241

 
(4
)
 
31,065

Foreign government and other securities
 
700

 
9

 
—

 
709

Total debt securities
 
819,997

 
14,076

 
(8,941
)
 
825,132

Marketable equity securities
 
2,166

 
5,404

 
(2
)
 
7,568

Total investment securities available-for-sale
 
$
822,163

 
$
19,480

 
$
(8,943
)
 
$
832,700
Schedule of contractual maturities of investments in debt securities available-for-sale
The following table shows the contractual maturities of investments in securities available-for-sale at September 30, 2014. 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
 
$
34,526

 
$
34,874

Due after one year through five years
 
416,243

 
421,493

Due after five years through ten years
 
95,275

 
95,054

Due after ten years
 
2,215

 
2,280

Mortgage-backed securities
 
249,710

 
253,461

Total debt securities available-for-sale
 
$
797,969

 
$
807,162
Schedule of gross realized gains and losses on sale of securities from securities available-for-sale portfolio
The following table shows the gross realized gains and losses on sale of securities from the securities available-for-sale portfolio, including marketable equity securities. Realized gains and losses on the sales of all securities are computed using the specific identification cost basis. The gross gains for the nine months ended September 30, 2014 reflect the sale of marketable equity securities during the first quarter. The gross gains and losses for the three and nine months ended September 30, 2013 primarily reflect the sale of federal agency securities. The trades were done for the purpose of balance sheet realignment and managing reinvestment risk by adjusting the timing of future cash flows.
 
 
 
Three Months Ended 
 September 30,
 
Nine Months Ended 
 September 30,
(Dollars in thousands)
 
2014
 
2013
 
2014
 
2013
Gross realized gains
 
$
—

 
$
903

 
$
963

 
$
903

Gross realized losses
 
—

 
(931
)
 
—

 
(931
)
Net realized gains (losses)
 
$
—

 
$
(28
)
 
$
963

 
$
(28
)
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, 2014
 
 

 
 

 
 

 
 

 
 

 
 

U.S. Treasury and Federal agencies securities
 
$
81,375

 
$
(285
)
 
$
119,848

 
$
(2,187
)
 
$
201,223

 
$
(2,472
)
U.S. States and political subdivisions securities
 
5,130

 
(36
)
 
8,630

 
(113
)
 
13,760

 
(149
)
Mortgage-backed securities - Federal agencies
 
48,001

 
(287
)
 
36,914

 
(1,299
)
 
84,915

 
(1,586
)
Corporate debt securities
 
8,560

 
(35
)
 
—

 
—

 
8,560

 
(35
)
Foreign government and other securities
 
—

 
—

 
—

 
—

 
—

 
—

Total debt securities
 
143,066

 
(643
)
 
165,392

 
(3,599
)
 
308,458

 
(4,242
)
Marketable equity securities
 
1

 
—

 
3

 
(2
)
 
4

 
(2
)
Total investment securities available-for-sale
 
$
143,067

 
$
(643
)
 
$
165,395

 
$
(3,601
)
 
$
308,462

 
$
(4,244
)
 
 
 
 
 
 
 
 
 
 
 
 
 
December 31, 2013
 
 

 
 

 
 

 
 

 
 

 
 

U.S. Treasury and Federal agencies securities
 
$
153,868

 
$
(4,404
)
 
$
15,085

 
$
(123
)
 
$
168,953

 
$
(4,527
)
U.S. States and political subdivisions securities
 
37,115

 
(814
)
 
1,419

 
(33
)
 
38,534

 
(847
)
Mortgage-backed securities - Federal agencies
 
99,488

 
(3,099
)
 
5,352

 
(464
)
 
104,840

 
(3,563
)
Corporate debt securities
 
6,332

 
(4
)
 
—

 
—

 
6,332

 
(4
)
Foreign government and other securities
 
—

 
—

 
—

 
—

 
—

 
—

Total debt securities
 
296,803

 
(8,321
)
 
21,856

 
(620
)
 
318,659

 
(8,941
)
Marketable equity securities
 
—

 
—

 
4

 
(2
)
 
4

 
(2
)
Total investment securities available-for-sale
 
$
296,803

 
$
(8,321
)
 
$
21,860

 
$
(622
)
 
$
318,663

 
$
(8,943
)