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Debt Securities Held to Maturity (Tables)
 12 Months Ended
Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]  
Debt securities, held-to-maturity

Debt securities held to maturity at December 31, 2019 and 2018 are summarized as follows:
 
December 31, 2019
 
Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized (Losses)
 
Fair Value
 
(In thousands)
 
 
 
 
 
 
 
 
U.S. government and agency obligations
$
20,000

 
$
26

 
$
(66
)
 
$
19,960

Mortgage-backed securities and collateralized mortgage obligations
265,756

 
4,048

 
(259
)
 
269,545

 
$
285,756

 
$
4,074

 
$
(325
)
 
$
289,505

 
December 31, 2018
 
Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized (Losses)
 
Fair Value
 
(In thousands)
 
 
 
 
 
 
 
 
U.S. government and agency obligations
$
23,404

 
$
45

 
$
(208
)
 
$
23,241

Mortgage-backed securities and collateralized mortgage obligations
238,739

 
28

 
(7,167
)
 
231,600

 
$
262,143

 
$
73

 
$
(7,375
)
 
$
254,841
Investments classified by contractual maturity date
The amortized cost and fair value of debt securities available for sale at December 31, 2019, by contractual final maturity is shown below. Expected maturities may differ from contractual maturities due to prepayment or early call options exercised by the issuer.
 
December 31, 2019
 
Amortized Cost
 
Fair Value
 
(In thousands)
 
 
 
 
One year or less
$
31,901

 
$
31,955

More than one year to five years
27,366

 
27,729

More than five years to ten years
53,235

 
53,669

More than ten years
5,476

 
5,102

 
117,978

 
118,455

Mortgage-backed securities and collateralized mortgage obligations
968,165

 
979,881

 
$
1,086,143

 
$
1,098,336


Expected maturities may differ from contractual maturities due to prepayment or early call options exercised by the issuer.
 
December 31, 2019
 
Amortized Cost
 
Fair Value
 
(In thousands)
 
 
 
 
More than ten years
$
20,000

 
$
19,960

Mortgage-backed securities and collateralized mortgage obligations
265,756

 
269,545

 
$
285,756

 
$
289,505
Schedule of unrealized loss on investments
The following table summarizes the fair value and gross unrealized losses of those securities that reported an unrealized loss at December 31, 2019 and 2018 and if the unrealized loss position was continuous for the twelve months prior to those respective dates:
 
December 31, 2019
 
Less Than 12 Months
 
12 Months or Longer
 
Total
 
Fair Value
 
Gross Unrealized (Losses)
 
Fair Value
 
Gross Unrealized (Losses)
 
Fair Value
 
Gross Unrealized (Losses)
 
(In thousands)
 
 
 
 
 
 
 
 
 
 
 
 
U.S. government and agency obligations
$
9,934

 
$
(66
)
 
$
—

 
$
—

 
$
9,934

 
$
(66
)
Mortgage-backed securities and collateralized mortgage obligations
27,911

 
(251
)
 
772

 
(8
)
 
28,683

 
(259
)
 
$
37,845

 
$
(317
)
 
$
772

 
$
(8
)
 
$
38,617

 
$
(325
)











(5)     Debt Securities Held to Maturity (continued)

 
December 31, 2018
 
Less than 12 months
 
12 months or longer
 
Total
 
Fair Value
 
Gross Unrealized (Losses)
 
Fair Value
 
Gross Unrealized (Losses)
 
Fair Value
 
Gross Unrealized (Losses)
 
(In thousands)
 
 
 
 
 
 
 
 
 
 
 
 
U.S. government and agency obligations
$
—

 
$
—

 
$
8,197

 
$
(208
)
 
$
8,197

 
$
(208
)
Mortgage-backed securities and collateralized mortgage obligations
11,265

 
(69
)
 
213,246

 
(7,098
)
 
224,511

 
(7,167
)
 
$
11,265

 
$
(69
)
 
$
221,443

 
$
(7,306
)
 
$
232,708

 
$
(7,375
)