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

$131,456

 

$28

 

($3,240
)
 

$128,244

Mortgage-backed securities issued by U.S. government agencies and U.S. government-sponsored enterprises
592,902

 
4,837

 
(8,946
)
 
588,793

Obligations of states and political subdivisions
8,548

 
36

 
—

 
8,584

Individual name issuer trust preferred debt securities
27,880

 
—

 
(2,743
)
 
25,137

Corporate bonds
4,131

 
14

 
(183
)
 
3,962

Total securities available for sale

$764,917

 

$4,915

 

($15,112
)
 

$754,720

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

$14,721

 

$244

 

$—

 

$14,965

Total securities held to maturity

$14,721

 

$244

 

$—

 

$14,965

Total securities

$779,638

 

$5,159

 

($15,112
)
 

$769,685



(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
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
March 31, 2017
Amortized Cost
 
Fair Value
 
Amortized Cost
 
Fair Value
Due in one year or less

$61,790

 

$61,370

 

$1,851

 

$1,881

Due after one year to five years
249,476

 
246,868

 
5,926

 
6,024

Due after five years to ten years
249,319

 
245,182

 
4,802

 
4,882

Due after ten years
204,332

 
201,300

 
2,142

 
2,178

Total securities

$764,917

 

$754,720

 

$14,721

 

$14,965
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
March 31, 2017
#
 
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

 

$98,249


($3,240
)
 
—

 

$—


$—

 
10

 

$98,249


($3,240
)
Mortgage-backed securities issued by U.S. government agencies and U.S. government-sponsored enterprises
35

 
390,070

(8,946
)
 
—

 
—

—

 
35

 
390,070

(8,946
)
Individual name issuer trust preferred debt securities
—

 
—

—

 
9

 
25,137

(2,743
)
 
9

 
25,137

(2,743
)
Corporate bonds
2

 
401

(3
)
 
1

 
1,800

(180
)
 
3

 
2,201

(183
)
Total temporarily impaired securities
47

 

$488,720


($12,189
)
 
10

 

$26,937


($2,923
)
 
57

 

$515,657


($15,112
)


(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
)