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Debt Securities Held to Maturity (Tables)
 6 Months Ended
Jun. 30, 2019
Investments, Debt and Equity Securities [Abstract]  
Schedule of amortized cost, gross unrealized gains, gross unrealized losses and the fair value of securities held-to-maturity
Debt securities held to maturity at June 30, 2019 and December 31, 2018 are summarized as follows:
 
June 30, 2019
 
Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized (Losses)
 
Fair Value
 
(In thousands)
 
 
 
 
 
 
 
 
U.S. government and agency obligations
$
38,406

 
$
115

 
$
—

 
$
38,521

Mortgage-backed securities and collateralized mortgage obligations
261,199

 
3,926

 
(467
)
 
264,658

 
$
299,605

 
$
4,041

 
$
(467
)
 
$
303,179

 
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
Schedule of securities by contractual maturity
The amortized cost and fair value of debt securities available for sale at June 30, 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.
 
June 30, 2019
 
Amortized Cost
 
Fair Value
 
(In thousands)
 
 
 
 
One year or less
$
12,319

 
$
12,322

More than one year to five years
45,050

 
45,319

More than five years to ten years
59,168

 
59,261

More than ten years
5,000

 
4,480

 
$
121,537

 
$
121,382

Mortgage-backed securities and collateralized mortgage obligations
965,224

 
978,419

 
$
1,086,761

 
$
1,099,801

Expected maturities may differ from contractual maturities due to prepayment or early call options exercised by the issuer.
 
June 30, 2019
 
Amortized Cost
 
Fair Value
 
(In thousands)
 
 
 
 
More than five years to ten years
$
28,406

 
$
28,443

More than ten years
10,000

 
10,078

 
38,406

 
38,521

Mortgage-backed securities and collateralized mortgage obligations
261,199

 
264,658

 
$
299,605

 
$
303,179
Schedule of held-to-maturity securities reported in a continuous unrealized loss position
The following tables summarize the fair value and gross unrealized losses of those securities that reported an unrealized loss at June 30, 2019 and December 31, 2018 and if the unrealized loss position was continuous for the twelve months prior to June 30, 2019 and December 31, 2018:
 
June 30, 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)
 
 
 
 
 
 
 
 
 
 
 
 
Mortgage-backed securities and collateralized mortgage obligations
$
7,711

 
$
(103
)
 
$
44,849

 
$
(364
)
 
$
52,560

 
$
(467
)
 
$
7,711

 
$
(103
)
 
$
44,849

 
$
(364
)
 
$
52,560

 
$
(467
)
 
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
)