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Securities (Tables)
 9 Months Ended
Sep. 30, 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)
 
September 30, 2016
Amortized Cost
 
Unrealized Gains
 
Unrealized Losses
 
Fair Value
Securities Available for Sale:
 
 
 
 
 
 
 
Obligations of U.S. government-sponsored enterprises

$75,500

 

$49

 

($65
)
 

$75,484

Mortgage-backed securities issued by U.S. government agencies and U.S. government-sponsored enterprises
434,430

 
8,564

 
(307
)
 
442,687

Obligations of states and political subdivisions
18,239

 
157

 
—

 
18,396

Individual name issuer trust preferred debt securities
29,842

 
—

 
(4,158
)
 
25,684

Corporate bonds
1,956

 
49

 
—

 
2,005

Total securities available for sale

$559,967

 

$8,819

 

($4,530
)
 

$564,256

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

$16,848

 

$644

 

$—

 

$17,492

Total securities held to maturity

$16,848

 

$644

 

$—

 

$17,492

Total securities

$576,815

 

$9,463

 

($4,530
)
 

$581,748



(Dollars in thousands)
 
December 31, 2015
Amortized Cost
 
Unrealized Gains
 
Unrealized Losses
 
Fair Value
Securities Available for Sale:
 
 
 
 
 
 
 
Obligations of 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
September 30, 2016
Amortized Cost
 
Fair Value
 
Amortized Cost
 
Fair Value
Due in one year or less

$70,876

 

$72,201

 

$4,019

 

$4,172

Due after one year to five years
187,480

 
190,915

 
8,835

 
9,173

Due after five years to ten years
185,358

 
187,402

 
3,394

 
3,524

Due after ten years
116,253

 
113,738

 
600

 
623

Total securities

$559,967

 

$564,256

 

$16,848

 

$17,492
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, 2016
#
 
Fair
Value
Unrealized
Losses
 
#

 
Fair
Value
Unrealized
Losses
 
#

 
Fair
Value
Unrealized
Losses
Obligations of U.S. government-sponsored enterprises
2

 

$29,935


($65
)
 
—

 

$—


$—

 
2

 

$29,935


($65
)
Mortgage-backed securities issued by U.S. government agencies and U.S. government-sponsored enterprises
8

 
136,398

(307
)
 
—

 
—

—

 
8

 
136,398

(307
)
Individual name issuer trust preferred debt securities
—

 
—

—

 
10

 
25,684

(4,158
)
 
10

 
25,684

(4,158
)
Total temporarily impaired securities
10

 

$166,333


($372
)
 
10

 

$25,684


($4,158
)
 
20

 

$192,017


($4,530
)


(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-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
)