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Securities (Tables)
 6 Months Ended
Jun. 30, 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)
 
June 30, 2017
Amortized Cost
 
Unrealized Gains
 
Unrealized Losses
 
Fair Value
Securities Available for Sale:
 
 
 
 
 
 
 
Obligations of U.S. government-sponsored enterprises

$131,484

 

$4

 

($2,558
)
 

$128,930

Mortgage-backed securities issued by U.S. government agencies and U.S. government-sponsored enterprises
587,814

 
4,763

 
(7,928
)
 
584,649

Obligations of states and political subdivisions
5,468

 
16

 
—

 
5,484

Individual name issuer trust preferred debt securities
27,888

 
—

 
(1,498
)
 
26,390

Corporate bonds
4,127

 
22

 
(116
)
 
4,033

Total securities available for sale

$756,781

 

$4,805

 

($12,100
)
 

$749,486

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

$13,942

 

$289

 

$—

 

$14,231

Total securities held to maturity

$13,942

 

$289

 

$—

 

$14,231

Total securities

$770,723

 

$5,094

 

($12,100
)
 

$763,717



(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
June 30, 2017
Amortized Cost
 
Fair Value
 
Amortized Cost
 
Fair Value
Due in one year or less

$64,607

 

$64,271

 

$2,422

 

$2,472

Due after one year to five years
249,039

 
246,979

 
6,586

 
6,723

Due after five years to ten years
251,102

 
247,891

 
3,876

 
3,956

Due after ten years
192,033

 
190,345

 
1,058

 
1,080

Total securities

$756,781

 

$749,486

 

$13,942

 

$14,231
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
June 30, 2017
#
 
Fair
Value
Unrealized
Losses
 
#

 
Fair
Value
Unrealized
Losses
 
#

 
Fair
Value
Unrealized
Losses
Obligations of U.S. government-sponsored enterprises
11

 

$108,930


($2,558
)
 
—

 

$—


$—

 
11

 

$108,930


($2,558
)
Mortgage-backed securities issued by U.S. government agencies and U.S. government-sponsored enterprises
35

 
379,226

(7,928
)
 
—

 
—

—

 
35

 
379,226

(7,928
)
Individual name issuer trust preferred debt securities
—

 
—

—

 
9

 
26,390

(1,498
)
 
9

 
26,390

(1,498
)
Corporate bonds
2

 
402

(3
)
 
1

 
1,868

(113
)
 
3

 
2,270

(116
)
Total temporarily impaired securities
48

 

$488,558


($10,489
)
 
10

 

$28,258


($1,611
)
 
58

 

$516,816


($12,100
)


(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
)