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Securities (Tables)
 9 Months Ended
Sep. 30, 2019
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, 2019
Amortized Cost
 
Unrealized Gains
 
Unrealized Losses
 
Fair Value
Available for Sale Debt Securities:
 
 
 
 
 
 
 
Obligations of U.S. government-sponsored enterprises

$196,734

 

$927

 

($337
)
 

$197,324

Mortgage-backed securities issued by U.S. government agencies and U.S. government-sponsored enterprises
659,096

 
8,614

 
(2,805
)
 
664,905

Individual name issuer trust preferred debt securities
13,320

 
—

 
(899
)
 
12,421

Corporate bonds
13,715

 
32

 
(1,377
)
 
12,370

Total available for sale debt securities

$882,865

 

$9,573

 

($5,418
)
 

$887,020

Total securities

$882,865

 

$9,573

 

($5,418
)
 

$887,020



(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)
Available for Sale
September 30, 2019
Amortized Cost
 
Fair Value
Due in one year or less

$105,671

 

$106,401

Due after one year to five years
340,179

 
342,582

Due after five years to ten years
289,520

 
290,083

Due after ten years
147,495

 
147,954

Total debt securities

$882,865

 

$887,020
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, 2019
#
 
Fair
Value
Unrealized
Losses
 
#

 
Fair
Value
Unrealized
Losses
 
#

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

 

$20,331


($169
)
 
4

 

$50,832


($168
)
 
7

 

$71,163


($337
)
Mortgage-backed securities issued by U.S. government agencies and U.S. government-sponsored enterprises
2

 
692

(1
)
 
25

 
239,550

(2,804
)
 
27

 
240,242

(2,805
)
Individual name issuer trust preferred debt securities
—

 
—

—

 
5

 
12,421

(899
)
 
5

 
12,421

(899
)
Corporate bonds
—

 
—

—

 
3

 
10,425

(1,377
)
 
3

 
10,425

(1,377
)
Total temporarily impaired securities
5

 

$21,023


($170
)
 
37

 

$313,228


($5,248
)
 
42

 

$334,251


($5,418
)


(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)
Three Months
 
Nine Months
For the periods ended September 30,
2019
 
2018
 
2019
 
2018
Proceeds from sales

$—

 

$—

 

$9,920

 

$—

 
 
 
 
 
 
 
 
Gross realized gains

$—

 

$—

 

$—

 

$—

Gross realized losses
—

 
—

 
(80
)
 
—

Net realized losses on securities

$—

 

$—

 

($80
)
 

$—