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Securities (Tables)
 9 Months Ended
Sep. 30, 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)
 
September 30, 2018
Amortized Cost
 
Unrealized Gains
 
Unrealized Losses
 
Fair Value
Securities Available for Sale:
 
 
 
 
 
 
 
Obligations of U.S. government-sponsored enterprises

$201,398

 

$9

 

($7,934
)
 

$193,473

Mortgage-backed securities issued by U.S. government agencies and U.S. government-sponsored enterprises
616,552

 
1,143

 
(24,833
)
 
592,862

Obligations of states and political subdivisions
935

 
2

 
—

 
937

Individual name issuer trust preferred debt securities
13,303

 
—

 
(839
)
 
12,464

Corporate bonds
13,911

 
—

 
(1,000
)
 
12,911

Total securities available for sale

$846,099

 

$1,154

 

($34,606
)
 

$812,647

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

$10,863

 

$—

 

($206
)
 

$10,657

Total securities held to maturity

$10,863

 

$—

 

($206
)
 

$10,657

Total securities

$856,962

 

$1,154

 

($34,812
)
 

$823,304



(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
September 30, 2018
Amortized Cost
 
Fair Value
 
Amortized Cost
 
Fair Value
Due in one year or less

$64,023

 

$61,577

 

$1,370

 

$1,344

Due after one year to five years
314,353

 
302,124

 
4,529

 
4,443

Due after five years to ten years
278,106

 
266,878

 
3,709

 
3,639

Due after ten years
189,617

 
182,068

 
1,255

 
1,231

Total securities

$846,099

 

$812,647

 

$10,863

 

$10,657
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, 2018
#
 
Fair
Value
Unrealized
Losses
 
#

 
Fair
Value
Unrealized
Losses
 
#

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

 

$77,958


($2,040
)
 
11

 

$105,606


($5,894
)
 
19

 

$183,564


($7,934
)
Mortgage-backed securities issued by U.S. government agencies and U.S. government-sponsored enterprises
37

 
235,900

(6,567
)
 
34

 
304,937

(18,472
)
 
71

 
540,837

(25,039
)
Individual name issuer trust preferred debt securities
—

 
—

—

 
5

 
12,464

(839
)
 
5

 
12,464

(839
)
Corporate bonds
4

 
1,706

(13
)
 
5

 
11,205

(987
)
 
9

 
12,911

(1,000
)
Total temporarily impaired securities
49

 

$315,564


($8,620
)
 
55

 

$434,212


($26,192
)
 
104

 

$749,776


($34,812
)


(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
)