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Securities (Tables)
 12 Months Ended
Dec. 31, 2019
Gain (Loss) on Securities [Line Items]  
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)
 
 
 
 
 
 
 
December 31, 2019
Amortized Cost
 
Unrealized Gains
 
Unrealized Losses
 
Fair Value
Available for Sale Debt Securities:
 
 
 
 
 
 
 
Obligations of U.S. government-sponsored enterprises

$157,255

 

$626

 

($233
)
 

$157,648

Mortgage-backed securities issued by U.S. government agencies and U.S. government-sponsored enterprises
713,553

 
8,491

 
(2,964
)
 
719,080

Individual name issuer trust preferred debt securities
13,324

 
—

 
(745
)
 
12,579

Corporate bonds
11,141

 
—

 
(958
)
 
10,183

Total available for sale debt securities

$895,273

 

$9,117

 

($4,900
)
 

$899,490

Total securities

$895,273

 

$9,117

 

($4,900
)
 

$899,490


(Dollars in thousands)
 
 
 
 
 
 
 
December 31, 2018
Amortized Cost
 
Unrealized Gains
 
Unrealized Losses
 
Fair Value
Available for Sale Debt Securities:
 
 
 
 
 
 
 
Obligations of U.S. government-sponsored enterprises

$246,708

 

$442

 

($4,467
)
 

$242,683

Mortgage-backed securities issued by U.S. government agencies and U.S. government-sponsored enterprises
675,368

 
1,943

 
(16,518
)
 
660,793

Obligations of states and political subdivisions
935

 
2

 
—

 
937

Individual name issuer trust preferred debt securities
13,307

 
—

 
(1,535
)
 
11,772

Corporate bonds
13,402

 
—

 
(1,777
)
 
11,625

Total available for sale debt securities

$949,720

 

$2,387

 

($24,297
)
 

$927,810

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

$10,415

 

$—

 

($99
)
 

$10,316

Total held to maturity debt securities
10,415

 
—

 
(99
)
 
10,316

Total securities

$960,135

 

$2,387

 

($24,396
)
 

$938,126
Securities by Contractual Maturity
The schedule of maturities of available for sale debt securities 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)
 
December 31, 2019
Amortized Cost
 
Fair Value
Due in one year or less

$103,241

 

$103,962

Due after one year to five years
349,290

 
351,538

Due after five years to ten years
264,354

 
264,958

Due after ten years
178,388

 
179,032

Total securities

$895,273

 

$899,490



Included in the above table are available for sale debt securities with an amortized cost balance of $180.4 million and a fair value of $179.1 million at December 31, 2019 that are callable at the discretion of the issuers.  Final maturities of the callable securities range from 4 months to 17 years, with call features ranging from 1 month to 2 years.
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
December 31, 2019
#

Fair
Value
Unrealized
Losses
 
#

Fair
Value
Unrealized
Losses
 
#

Fair
Value
Unrealized
Losses
Obligations of U.S. government-sponsored enterprises
3


$20,364


($136
)
 
3


$49,902


($97
)
 
6


$70,266


($233
)
Mortgage-backed securities issued by U.S. government agencies and U.S. government-sponsored enterprises
4

41,150

(56
)
 
23

216,804

(2,908
)
 
27

257,954

(2,964
)
Individual name issuer trust preferred debt securities
—

—

—

 
5

12,579

(745
)
 
5

12,579

(745
)
Corporate bonds
—

—

—

 
3

10,183

(958
)
 
3

10,183

(958
)
Total temporarily impaired securities
7


$61,514


($192
)
 
34


$289,468


($4,708
)
 
41


$350,982


($4,900
)

(Dollars in thousands)
Less than 12 Months
 
12 Months or Longer
 
Total
December 31, 2018
#

Fair
Value
Unrealized
Losses
 
#

Fair
Value
Unrealized
Losses
 
#

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


$—


$—

 
16


$157,032


($4,467
)
 
16


$157,032


($4,467
)
Mortgage-backed securities issued by U.S. government agencies and U.S. government-sponsored enterprises
10

47,060

(439
)
 
51

438,701

(16,178
)
 
61

485,761

(16,617
)
Individual name issuer trust preferred debt securities
—

—

—

 
5

11,772

(1,535
)
 
5

11,772

(1,535
)
Corporate bonds
3

1,198

(9
)
 
5

10,427

(1,768
)
 
8

11,625

(1,777
)
Total temporarily impaired securities
13


$48,258


($448
)
 
77


$617,932


($23,948
)
 
90


$666,190


($24,396
)
Schedule of Realized Gain (Loss)
The following table summarizes amounts relating to sales of securities:
(Dollars in thousands)
 
 
 
 
 
For the periods ended December 31,
2019

 
2018

 
2017

Proceeds from sales

$11,877

 

$—

 

$—

 
 
 
 
 
 
Gross realized gains

$—

 

$—

 

$—

Gross realized losses
(53
)
 
—

 
—

Net realized losses on securities

($53
)
 

$—

 

$—