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Securities (Tables)
 3 Months Ended
Mar. 31, 2018
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, 2018
Amortized Cost
 
Unrealized Gains
 
Unrealized Losses
 
Fair Value
Securities Available for Sale:
 
 
 
 
 
 
 
Obligations of U.S. government-sponsored enterprises

$171,491

 

$9

 

($5,886
)
 

$165,614

Mortgage-backed securities issued by U.S. government agencies and U.S. government-sponsored enterprises
605,430

 
1,936

 
(17,619
)
 
589,747

Obligations of states and political subdivisions
2,355

 
4

 
—

 
2,359

Individual name issuer trust preferred debt securities
18,112

 
—

 
(1,016
)
 
17,096

Corporate bonds
13,914

 
—

 
(888
)
 
13,026

Total securities available for sale

$811,302

 

$1,949

 

($25,409
)
 

$787,842

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

$11,973

 

$38

 

($16
)
 

$11,995

Total securities held to maturity

$11,973

 

$38

 

($16
)
 

$11,995

Total securities

$823,275

 

$1,987

 

($25,425
)
 

$799,837



(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
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, 2018
Amortized Cost
 
Fair Value
 
Amortized Cost
 
Fair Value
Due in one year or less

$63,132

 

$61,513

 

$1,663

 

$1,666

Due after one year to five years
262,288

 
254,949

 
5,192

 
5,202

Due after five years to ten years
290,876

 
281,962

 
3,840

 
3,847

Due after ten years
195,006

 
189,418

 
1,278

 
1,280

Total securities

$811,302

 

$787,842

 

$11,973

 

$11,995
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, 2018
#
 
Fair
Value
Unrealized
Losses
 
#

 
Fair
Value
Unrealized
Losses
 
#

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

 

$68,706


($1,787
)
 
8

 

$86,901


($4,099
)
 
16

 

$155,607


($5,886
)
Mortgage-backed securities issued by U.S. government agencies and U.S. government-sponsored enterprises
32

 
249,667

(4,807
)
 
22

 
265,077

(12,828
)
 
54

 
514,744

(17,635
)
Individual name issuer trust preferred debt securities
—

 
—

—

 
7

 
17,096

(1,016
)
 
7

 
17,096

(1,016
)
Corporate bonds
6

 
2,112

(18
)
 
3

 
10,914

(870
)
 
9

 
13,026

(888
)
Total temporarily impaired securities
46

 

$320,485


($6,612
)
 
40

 

$379,988


($18,813
)
 
86

 

$700,473


($25,425
)


(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
)