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Securities (Tables)
 3 Months Ended
Mar. 31, 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)
 
March 31, 2019
Amortized Cost
 
Unrealized Gains
 
Unrealized Losses
 
Fair Value
Available for Sale Debt Securities:
 
 
 
 
 
 
 
Obligations of U.S. government-sponsored enterprises

$246,717

 

$682

 

($1,927
)
 

$245,472

Mortgage-backed securities issued by U.S. government agencies and U.S. government-sponsored enterprises
727,511

 
4,341

 
(8,347
)
 
723,505

Obligations of states and political subdivisions
935

 
2

 
—

 
937

Individual name issuer trust preferred debt securities
13,311

 
—

 
(941
)
 
12,370

Corporate bonds
13,911

 
9

 
(1,323
)
 
12,597

Total available for sale debt securities

$1,002,385

 

$5,034

 

($12,538
)
 

$994,881

Total securities

$1,002,385

 

$5,034

 

($12,538
)
 

$994,881



(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
March 31, 2019
Amortized Cost
 
Fair Value
Due in one year or less

$74,364

 

$73,944

Due after one year to five years
345,082

 
343,090

Due after five years to ten years
351,603

 
348,484

Due after ten years
231,336

 
229,363

Total debt securities

$1,002,385

 

$994,881
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, 2019
#
 
Fair
Value
Unrealized
Losses
 
#

 
Fair
Value
Unrealized
Losses
 
#

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

 

$—


$—

 
14

 

$139,573


($1,927
)
 
14

 

$139,573


($1,927
)
Mortgage-backed securities issued by U.S. government agencies and U.S. government-sponsored enterprises
—

 
—

—

 
47

 
409,374

(8,347
)
 
47

 
409,374

(8,347
)
Individual name issuer trust preferred debt securities
—

 
—

—

 
5

 
12,370

(941
)
 
5

 
12,370

(941
)
Corporate bonds
—

 
—

—

 
7

 
11,874

(1,323
)
 
7

 
11,874

(1,323
)
Total temporarily impaired securities
—

 

$—


$—

 
73

 

$573,191


($12,538
)
 
73

 

$573,191


($12,538
)


(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
)