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Investment Securities (Tables)
 9 Months Ended
Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract]  
Schedule of available-for-sale investment securities
Our available-for-sale investment securities were as follows:
 
Amortized cost
 
Gross unrealized gains
 
Gross unrealized losses
 
Fair value
 
(In thousands)
September 30, 2018
 
Negotiable certificate of deposit
$
15,000

 
$
—

 
$
—

 
$
15,000

Agency bond securities
19,712

 
—

 
(128
)
 
19,584

Agency mortgage-backed securities
114,158

 
43

 
(1,730
)
 
112,471

Municipal bonds
507

 
—

 
(30
)
 
477

Asset-backed securities
76,452

 
2

 
(109
)
 
76,345

Total investment securities
$
225,829

 
$
45

 
$
(1,997
)
 
$
223,877

 
 
 
 
 
 
 
 
December 31, 2017
 
 
 
 
 
 
 
Corporate bonds
$
1,000

 
$
—

 
$
—

 
$
1,000

U.S. Treasury notes
10,921

 
—

 
(46
)
 
10,875

Agency mortgage-backed securities
121,037

 
52

 
(1,055
)
 
120,034

Municipal bonds
742

 
4

 
(7
)
 
739

Asset-backed securities
20,952

 
—

 
(91
)
 
20,861

Total investment securities
$
154,652

 
$
56

 
$
(1,199
)
 
$
153,509


Note 5—Investment Securities (continued)
As of September 30, 2018 and December 31, 2017, the gross unrealized losses and fair values of available-for-sale investment securities that were in unrealized loss positions were as follows:
 
Less than 12 months
 
12 months or more
 
Total fair value
 
Total unrealized loss
 
Fair value
 
Unrealized loss
 
Fair value
 
Unrealized loss
 
 
 
(In thousands)
September 30, 2018
 
Agency bond securities
$
19,584

 
$
(128
)
 
$
—

 
$
—

 
$
19,584

 
$
(128
)
Agency mortgage-backed securities
32,282

 
(328
)
 
65,414

 
(1,402
)
 
97,696

 
(1,730
)
Municipal bonds
346

 
(21
)
 
131

 
(9
)
 
477

 
(30
)
Asset-backed securities
55,665

 
(65
)
 
9,259

 
(44
)
 
64,924

 
(109
)
Total investment securities
$
107,877

 
$
(542
)
 
$
74,804

 
$
(1,455
)
 
$
182,681

 
$
(1,997
)
 
 
 
 
 
 
 
 
 
 
 
 
December 31, 2017
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury notes
$
4,588

 
$
(21
)
 
$
6,288

 
$
(25
)
 
$
10,876

 
$
(46
)
Agency mortgage-backed securities
62,683

 
(453
)
 
44,159

 
(602
)
 
106,842

 
(1,055
)
Municipal bonds
—

 
—

 
193

 
(7
)
 
193

 
(7
)
Asset-backed securities
2,134

 
(2
)
 
18,727

 
(89
)
 
20,861

 
(91
)
Total investment securities
$
69,405

 
$
(476
)
 
$
69,367

 
$
(723
)
 
$
138,772

 
$
(1,199
)
Schedule of maturity dates for available-for-sale investment securities
As of September 30, 2018, the contractual maturities of our available-for-sale investment securities were as follows:
 
Amortized cost
 
Fair value
 
(In thousands)
Due in one year or less
$
14,962

 
$
14,946

Due after one year through five years
19,750

 
19,638

Due after five years through ten years
—

 
—

Due after ten years
507

 
477

Mortgage and asset-backed securities
190,610

 
188,816

Total investment securities
$
225,829

 
$
223,877