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Securities (Tables)
 12 Months Ended
Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]  
Summary of Investments
The following tables present the amortized cost, gross unrealized holding gains, gross unrealized holding losses, and fair value of securities by major security type and class of security:
(Dollars in thousands)
 
 
 
 
 
 
 
December 31, 2016
Amortized Cost
 
Unrealized Gains
 
Unrealized Losses
 
Fair Value
Securities Available for Sale:
 
 
 
 
 
 
 
Obligations of U.S. government agencies and U.S. government-sponsored enterprises

$111,483

 

$7

 

($3,050
)
 

$108,440

Mortgage-backed securities issued by U.S. government agencies and U.S. government-sponsored enterprises
592,833

 
4,923

 
(9,671
)
 
588,085

Obligations of states and political subdivisions
14,423

 
62

 
—

 
14,485

Individual name issuer trust preferred debt securities
29,851

 
—

 
(3,115
)
 
26,736

Corporate bonds
2,155

 
16

 
(5
)
 
2,166

Total securities available for sale

$750,745

 

$5,008

 

($15,841
)
 

$739,912

Held to Maturity:
 
 
 
 
 
 
 
Mortgage-backed securities issued by U.S. government agencies and U.S. government-sponsored enterprises

$15,633

 

$287

 

$—

 

$15,920

Total securities held to maturity
15,633

 
287

 
—

 
15,920

Total securities

$766,378

 

$5,295

 

($15,841
)
 

$755,832


(Dollars in thousands)
 
 
 
 
 
 
 
December 31, 2015
Amortized Cost
 
Unrealized Gains
 
Unrealized Losses
 
Fair Value
Securities Available for Sale:
 
 
 
 
 
 
 
Obligations of U.S. government agencies and U.S. government-sponsored enterprises

$77,330

 

$73

 

($388
)
 

$77,015

Mortgage-backed securities issued by U.S. government agencies and U.S. government-sponsored enterprises
228,908

 
6,398

 
(450
)
 
234,856

Obligations of states and political subdivisions
35,353

 
727

 
—

 
36,080

Individual name issuer trust preferred debt securities
29,815

 
—

 
(4,677
)
 
25,138

Corporate bonds
1,970

 
5

 
(20
)
 
1,955

Total securities available for sale

$373,376

 

$7,203

 

($5,535
)
 

$375,044

Held to Maturity:
 
 
 
 
 
 
 
Mortgage-backed securities issued by U.S. government agencies and U.S. government-sponsored enterprises

$20,023

 

$493

 

$—

 

$20,516

Total securities held to maturity
20,023

 
493

 
—

 
20,516

Total securities

$393,399

 

$7,696

 

($5,535
)
 

$395,560
Securities by Contractual Maturity
The schedule of maturities of debt securities available for sale and held to maturity is presented below. Mortgage-backed securities are included based on weighted average maturities, adjusted for anticipated prepayments.  All other debt securities are included based on contractual maturities.  Actual maturities may differ from amounts presented because certain issuers have the right to call or prepay obligations with or without call or prepayment penalties.
(Dollars in thousands)
Available for Sale
 
Held to Maturity
December 31, 2016
Amortized Cost
 
Fair Value
 
Amortized Cost
 
Fair Value
Due in one year or less

$75,499

 

$74,921

 

$2,605

 

$2,653

Due after one year to five years
254,974

 
252,489

 
7,157

 
7,288

Due after five years to ten years
239,622

 
236,175

 
4,414

 
4,495

Due after ten years
180,650

 
176,327

 
1,457

 
1,484

Total securities

$750,745

 

$739,912

 

$15,633

 

$15,920



Included in the above table were debt securities with an amortized cost balance of $155.6 million and a fair value of $149.5 million at December 31, 2016 that are callable at the discretion of the issuers.  Final maturities of the callable securities range from 2 months to 20 years, with call features ranging from 1 month to 5 years.
Securities in a Continuous Unrealized Loss Position
The following tables summarize temporarily impaired securities, segregated by length of time the securities have been in a continuous unrealized loss position:
(Dollars in thousands)
Less than 12 Months
 
12 Months or Longer
 
Total
December 31, 2016
#

Fair
Value
Unrealized
Losses
 
#

Fair
Value
Unrealized
Losses
 
#

Fair
Value
Unrealized
Losses
Obligations of U.S. government agencies and U.S. government-sponsored enterprises
10


$98,433


($3,050
)
 
—


$—


$—

 
10


$98,433


($3,050
)
Mortgage-backed securities issued by U.S. government agencies and U.S. government-sponsored enterprises
35

407,073

(9,671
)
 
—

—

—

 
35

407,073

(9,671
)
Individual name issuer trust preferred debt securities
—

—

—

 
10

26,736

(3,115
)
 
10

26,736

(3,115
)
Corporate bonds
2

400

(5
)
 
—

—

—

 
2

400

(5
)
Total temporarily impaired securities
47


$505,906


($12,726
)
 
10


$26,736


($3,115
)
 
57


$532,642


($15,841
)

(Dollars in thousands)
Less than 12 Months
 
12 Months or Longer
 
Total
December 31, 2015
#

Fair
Value
Unrealized
Losses
 
#

Fair
Value
Unrealized
Losses
 
#

Fair
Value
Unrealized
Losses
Obligations of U.S. government agencies and U.S. government-sponsored enterprises
4


$34,767


($388
)
 
—


$—


$—

 
4


$34,767


($388
)
Mortgage-backed securities issued by U.S. government agencies and U.S. government-sponsored enterprises
9

61,764

(450
)
 
—

—

—

 
9

61,764

(450
)
Individual name issuer trust preferred debt securities
—

—

—

 
10

25,138

(4,677
)
 
10

25,138

(4,677
)
Corporate bonds
3

1,235

(20
)
 
—

—

—

 
3

1,235

(20
)
Total temporarily impaired securities
16


$97,766


($858
)
 
10


$25,138


($4,677
)
 
26


$122,904


($5,535
)