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

$121,499

 

$—

 

($2,374
)
 

$119,125

Mortgage-backed securities issued by U.S. government agencies and U.S. government-sponsored enterprises
563,240

 
4,915

 
(6,485
)
 
561,670

Obligations of states and political subdivisions
3,156

 
7

 
—

 
3,163

Individual name issuer trust preferred debt securities
27,897

 
—

 
(1,509
)
 
26,388

Corporate bonds
4,122

 
24

 
(137
)
 
4,009

Total securities available for sale

$719,914

 

$4,946

 

($10,505
)
 

$714,355

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

$13,241

 

$296

 

$—

 

$13,537

Total securities held to maturity

$13,241

 

$296

 

$—

 

$13,537

Total securities

$733,155

 

$5,242

 

($10,505
)
 

$727,892



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

$59,796

 

$59,636

 

$1,792

 

$1,832

Due after one year to five years
226,076

 
224,715

 
5,603

 
5,728

Due after five years to ten years
246,549

 
243,740

 
4,239

 
4,334

Due after ten years
187,493

 
186,264

 
1,607

 
1,643

Total securities

$719,914

 

$714,355

 

$13,241

 

$13,537
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
September 30, 2017
#
 
Fair
Value
Unrealized
Losses
 
#

 
Fair
Value
Unrealized
Losses
 
#

 
Fair
Value
Unrealized
Losses
Obligations of U.S. government-sponsored enterprises
9

 

$79,988


($1,511
)
 
2

 

$29,137


($863
)
 
11

 

$109,125


($2,374
)
Mortgage-backed securities issued by U.S. government agencies and U.S. government-sponsored enterprises
20

 
153,078

(2,200
)
 
14

 
179,166

(4,285
)
 
34

 
332,244

(6,485
)
Individual name issuer trust preferred debt securities
—

 
—

—

 
9

 
26,388

(1,509
)
 
9

 
26,388

(1,509
)
Corporate bonds
2

 
402

(1
)
 
1

 
1,845

(136
)
 
3

 
2,247

(137
)
Total temporarily impaired securities
31

 

$233,468


($3,712
)
 
26

 

$236,536


($6,793
)
 
57

 

$470,004


($10,505
)


(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
)