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Investment Securities (Tables)
 6 Months Ended
Jun. 30, 2018
Investments, Debt and Equity Securities [Abstract]  
Investment Securities, Available-for-sale
As of June 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)
June 30, 2018
 
Agency bond securities
$
14,904

 
$
(48
)
 
$
—

 
$
—

 
$
14,904

 
$
(48
)
Agency mortgage-backed securities
52,114

 
(366
)
 
45,236

 
(1,148
)
 
97,350

 
(1,514
)
Municipal bonds
427

 
(12
)
 
156

 
(9
)
 
583

 
(21
)
Asset-backed securities
29,436

 
(13
)
 
9,238

 
(68
)
 
38,674

 
(81
)
Total investment securities
$
96,881

 
$
(439
)
 
$
54,630

 
$
(1,225
)
 
$
151,511

 
$
(1,664
)
 
 
 
 
 
 
 
 
 
 
 
 
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
)
Our available-for-sale investment securities were as follows:
 
Amortized cost
 
Gross unrealized gains
 
Gross unrealized losses
 
Fair value
 
(In thousands)
June 30, 2018
 
Negotiable certificate of deposit
$
20,000

 
$
—

 
$
—

 
$
20,000

Agency bond securities
14,952

 
—

 
(48
)
 
14,904

Agency mortgage-backed securities
118,350

 
32

 
(1,514
)
 
116,868

Municipal bonds
604

 
—

 
(21
)
 
583

Asset-backed securities
38,756

 
—

 
(81
)
 
38,675

Total investment securities
$
192,662

 
$
32

 
$
(1,664
)
 
$
191,030

 
 
 
 
 
 
 
 
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
Investments Classified by Contractual Maturity Date
As of June 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
$
15,000

 
$
15,000

Due after one year through five years
19,952

 
19,904

Due after five years through ten years
—

 
—

Due after ten years
604

 
583

Mortgage and asset-backed securities
157,106

 
155,543

Total investment securities
$
192,662

 
$
191,030