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Securities (Tables)
 12 Months Ended
Dec. 31, 2017
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, 2017
Amortized Cost
 
Unrealized Gains
 
Unrealized Losses
 
Fair Value
Securities Available for Sale:
 
 
 
 
 
 
 
Obligations of U.S. government-sponsored enterprises

$161,479

 

$—

 

($3,875
)
 

$157,604

Mortgage-backed securities issued by U.S. government agencies and U.S. government-sponsored enterprises
594,944

 
3,671

 
(7,733
)
 
590,882

Obligations of states and political subdivisions
2,355

 
4

 
—

 
2,359

Individual name issuer trust preferred debt securities
18,106

 
—

 
(1,122
)
 
16,984

Corporate bonds
13,917

 
13

 
(805
)
 
13,125

Total securities available for sale

$790,801

 

$3,688

 

($13,535
)
 

$780,954

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

$12,541

 

$180

 

$—

 

$12,721

Total securities held to maturity
12,541

 
180

 
—

 
12,721

Total securities

$803,342

 

$3,868

 

($13,535
)
 

$793,675


(Dollars in thousands)
 
 
 
 
 
 
 
December 31, 2016
Amortized Cost
 
Unrealized Gains
 
Unrealized Losses
 
Fair Value
Securities Available for Sale:
 
 
 
 
 
 
 
Obligations of 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
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, 2017
Amortized Cost
 
Fair Value
 
Amortized Cost
 
Fair Value
Due in one year or less

$62,120

 

$61,700

 

$1,719

 

$1,743

Due after one year to five years
247,054

 
244,392

 
5,374

 
5,451

Due after five years to ten years
285,543

 
280,870

 
4,019

 
4,077

Due after ten years
196,084

 
193,992

 
1,429

 
1,450

Total securities

$790,801

 

$780,954

 

$12,541

 

$12,721



Included in the above table were debt securities with an amortized cost balance of $195.4 million and a fair value of $189.7 million at December 31, 2017 that are callable at the discretion of the issuers.  Final maturities of the callable securities range from 5 months to 19 years, with call features ranging from 1 month to 4 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, 2017
#

Fair
Value
Unrealized
Losses
 
#

Fair
Value
Unrealized
Losses
 
#

Fair
Value
Unrealized
Losses
Obligations of U.S. government-sponsored enterprises
8


$69,681


($798
)
 
8


$87,923


($3,077
)
 
16


$157,604


($3,875
)
Mortgage-backed securities issued by U.S. government agencies and U.S. government-sponsored enterprises
20

128,965

(613
)
 
22

279,693

(7,120
)
 
42

408,658

(7,733
)
Individual name issuer trust preferred debt securities
—

—

—

 
7

16,984

(1,122
)
 
7

16,984

(1,122
)
Corporate bonds
3

921

(5
)
 
3

10,980

(800
)
 
6

11,901

(805
)
Total temporarily impaired securities
31


$199,567


($1,416
)
 
40


$395,580


($12,119
)
 
71


$595,147


($13,535
)

(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-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
)