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Securities Available for Sale (Tables)
 12 Months Ended
Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]  
Securities Available for Sale
Securities available for sale at December 31, 2017 and 2016 are summarized as follows (in thousands):
 
2017
 
Amortized
cost
 
Gross
unrealized
gains
 
Gross
unrealized
losses
 
Fair value
Agency obligations
$
19,014

 
—

 
(9
)
 
19,005

Mortgage-backed securities
993,548

 
4,914

 
(10,095
)
 
988,367

State and municipal obligations
3,259

 
129

 
—

 
3,388

Corporate obligations
26,047

 
359

 
(12
)
 
26,394

Equity securities
417

 
241

 
—

 
658

 
$
1,042,285

 
5,643

 
(10,116
)
 
1,037,812

 
2016
 
Amortized
cost
 
Gross
unrealized
gains
 
Gross
unrealized
losses
 
Fair value
U.S. Treasury obligations
$
7,995

 
13

 
—

 
8,008

Agency obligations
57,123

 
90

 
(25
)
 
57,188

Mortgage-backed securities
952,992

 
7,249

 
(8,380
)
 
951,861

State and municipal obligations
3,727

 
19

 
(3
)
 
3,743

Corporate obligations
19,013

 
35

 
(11
)
 
19,037

Equity securities
397

 
152

 
—

 
549

 
$
1,041,247

 
7,558

 
(8,419
)
 
1,040,386
Securities Available for Sale by Contractual Maturity
The amortized cost and fair value of securities available for sale at December 31, 2017, by contractual maturity, are shown below (in thousands). Expected maturities may differ from contractual maturities due to prepayment or early call privileges of the issuer.
 
2017
 
Amortized
cost
 
Fair
value
Due in one year or less
$
20,406

 
20,390

Due after one year through five years
3,009

 
3,048

Due after five years through ten years
24,905

 
25,349

 
$
48,320

 
48,787
Disclosure on Securities Available for Sale with Temporary Impairment
The following table represents the Company’s disclosure on securities available for sale with temporary impairment (in thousands):
 
December 31, 2017 Unrealized Losses
 
Less than 12 months
 
12 months or longer
 
Total
 
Fair value
 
Gross
unrealized
losses
 
Fair value
 
Gross
unrealized
losses
 
Fair value
 
Gross
unrealized
losses
Agency obligations
$
12,006

 
(8
)
 
6,999

 
(1
)
 
19,005

 
(9
)
Mortgage-backed securities
420,746

 
(3,936
)
 
235,056

 
(6,159
)
 
655,802

 
(10,095
)
Corporate obligations
—

 
—

 
989

 
(12
)
 
989

 
(12
)
 
$
432,752

 
(3,944
)
 
243,044

 
(6,172
)
 
675,796

 
(10,116
)
 
December 31, 2016 Unrealized Losses
 
Less than 12 months
 
12 months or longer
 
Total
 
Fair value
 
Gross
unrealized
losses
 
Fair value
 
Gross
unrealized
losses
 
Fair value
 
Gross
unrealized
losses
Agency obligations
$
14,000

 
(25
)
 
—

 
—

 
14,000

 
(25
)
Mortgage-backed securities
553,629

 
(8,377
)
 
65

 
(3
)
 
553,694

 
(8,380
)
State and municipal obligations
661

 
(3
)
 
—

 
—

 
661

 
(3
)
Corporate obligations
—

 


 
990

 
(11
)
 
990

 
(11
)
 
$
568,290

 
(8,405
)
 
1,055

 
(14
)
 
569,345

 
(8,419
)