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Securities Available for Sale (Tables)
 12 Months Ended
Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract]  
Schedule of amortized cost, gross unrealized gains, gross unrealized losses and the fair value of securities available-for-sale
Securities available for sale at December 31, 2018 and 2017 are summarized as follows:
 
December 31, 2018
 
Amortized cost
 
Gross unrealized gains
 
Gross unrealized (losses)
 
Fair value
 
 
 
(In thousands)
 
 
 
 
 
 
 
 
 
 
U.S. government and agency obligations
$
54,821

 
$
53

 
$
(717
)
 
$
54,157

Mortgage-backed securities and collateralized mortgage obligations
934,631

 
2,812

 
(17,436
)
 
920,007

Municipal obligations
987

 
—

 
—

 
987

Corporate debt securities
54,493

 
129

 
(1,155
)
 
53,467

Trust preferred securities
5,000

 
—

 
(750
)
 
4,250

Equity securities
1,196

 
694

 
—

 
1,890

 
$
1,051,128

 
$
3,688

 
$
(20,058
)
 
$
1,034,758

 
December 31, 2017
 
Amortized cost
 
Gross unrealized gains
 
Gross unrealized (losses)
 
Fair value
 
 
 
(In thousands)
 
 
 
 
 
 
 
 
 
 
U.S. government and agency obligations
$
39,909

 
$
17

 
$
(282
)
 
$
39,644

Mortgage-backed securities and collateralized mortgage obligations
615,924

 
383

 
(9,695
)
 
606,612

Municipal obligations
1,957

 
—

 
—

 
1,957

Corporate debt securities
54,489

 
536

 
(511
)
 
54,514

Trust preferred securities
5,000

 
—

 
(344
)
 
4,656

Equity securities
2,328

 
859

 
—

 
3,187

 
$
719,607

 
$
1,795

 
$
(10,832
)
 
$
710,570
Schedule of securities by contractual maturity
The amortized cost and fair value of debt securities available for sale at December 31, 2018, by contractual final maturity, excluding equity securities is shown below. Expected maturities may differ from contractual maturities due to prepayment or early call privileges of the issuer.
 
December 31, 2018
 
Amortized cost
 
Fair value
 
(In thousands)
 
 
 
 
One year or less
$
797

 
$
797

More than one year to five years
50,131

 
49,613

More than five years to ten years
59,373

 
57,971

More than ten years
5,000

 
4,480

 
115,301

 
112,861

Mortgage-backed securities and collateralized mortgage obligations
934,631

 
920,007

 
$
1,049,932

 
$
1,032,868

The amortized cost and fair value of debt securities held to maturity at December 31, 2018, by contractual final maturity, are shown below. Expected maturities may differ from contractual maturities due to prepayment or early call privileges of the issuer.
 
December 31, 2018
 
Amortized cost
 
Fair value
 
(In thousands)
 
 
 
 
More than one year to five years
$
5,000

 
$
5,000

More than five years to ten years
8,404

 
8,196

More than ten years
10,000

 
10,045

 
23,404

 
23,241

Mortgage-backed securities and collateralized mortgage obligations
238,739

 
231,600

 
$
262,143

 
$
254,841
Schedule of available-for-sale securities reported in a continuous unrealized loss position
The following table summarizes the fair value and gross unrealized losses of those securities that reported an unrealized loss at December 31, 2018 and 2017 and if the unrealized loss position was continuous for the twelve months prior to those respective dates:
 
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
$
14,668

 
$
(202
)
 
$
29,437

 
$
(515
)
 
$
44,105

 
$
(717
)
Mortgage-backed securities and collateralized mortgage obligations
176,614

 
(1,034
)
 
509,397

 
(16,402
)
 
686,011

 
(17,436
)
Corporate debt securities
26,480

 
(512
)
 
9,358

 
(643
)
 
35,838

 
(1,155
)
Trust preferred securities
—

 
—

 
4,250

 
(750
)
 
4,250

 
(750
)
 
$
217,762

 
$
(1,748
)
 
$
552,442

 
$
(18,310
)
 
$
770,204

 
$
(20,058
)














(3)     Securities Available for Sale (continued)
 
December 31, 2017
 
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
$
29,654

 
$
(282
)
 
$
—

 
$
—

 
$
29,654

 
$
(282
)
Mortgage-backed securities and collateralized mortgage obligations
514,283

 
(8,037
)
 
48,788

 
(1,658
)
 
563,071

 
(9,695
)
Corporate debt securities
4,866

 
(135
)
 
4,624

 
(376
)
 
9,490

 
(511
)
Trust preferred securities
—

 
—

 
4,656

 
(344
)
 
4,656

 
(344
)
 
$
548,803

 
$
(8,454
)
 
$
58,068

 
$
(2,378
)
 
$
606,871

 
$
(10,832
)