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Investments (Tables)
 9 Months Ended
Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract]  
Schedule of amortized cost and fair value of securities available for sale The amortized cost and fair value of securities available for sale are as follows:

 
 
September 30, 2018
 
 
Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Estimated Fair Value
Available for sale:
 
 
 
 
 
 
 
 
Mortgage-backed securities
 
$
159,397

 
$
92

 
$
(8,046
)
 
$
151,443

Utah Housing Corporation bonds
 
22,388

 
—

 
(1,461
)
 
20,927

Total
 
$
181,785

 
$
92

 
$
(9,507
)
 
$
172,370

 
 
 
 
 
 
 
 
 
 
 
December 31, 2017
 
 
Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Estimated Fair Value
Available for sale:
 
 
 
 
 
 
 
 
Mortgage-backed securities
 
$
227,607

 
$
650

 
$
(3,210
)
 
$
225,047

Utah Housing Corporation bonds
 
20,000

 
—

 
(959
)
 
19,041

Total
 
$
247,607

 
$
650

 
$
(4,169
)
 
$
244,088
Available-for-sale securities, continuous unrealized loss position, fair value The following table summarizes the amount of gross unrealized losses for our mortgage-backed securities and Utah Housing Corporation bonds and the estimated fair value for securities having gross unrealized losses, categorized by length of time the securities have been in an unrealized loss position:
 
 
Less than 12 months
 
12 months or more
 
Total
 
 
Gross Unrealized Losses
 
Estimated Fair Value
 
Gross Unrealized Losses
 
Estimated Fair Value
 
Gross Unrealized Losses
 
Estimated Fair Value
As of September 30, 2018:
 
 
 
 
 
 
 
 
 
 
 
 
Mortgage-backed securities
 
$
(1,768
)
 
$
43,253

 
$
(6,278
)
 
$
104,841

 
$
(8,046
)
 
$
148,094

Utah Housing Corporation bonds
 
(125
)
 
4,875

 
(1,336
)
 
16,052

 
(1,461
)
 
20,927

Total
 
$
(1,893
)
 
$
48,128

 
$
(7,614
)
 
$
120,893

 
$
(9,507
)
 
$
169,021

 
 
 
 
 
 
 
 
 
 
 
 
 
As of December 31, 2017:
 
 
 
 
 
 
 
 
 
 
 
 
Mortgage-backed securities
 
$
(772
)
 
$
77,356

 
$
(2,438
)
 
$
110,500

 
$
(3,210
)
 
$
187,856

Utah Housing Corporation bonds
 
(77
)
 
4,923

 
(882
)
 
14,118

 
(959
)
 
19,041

Total
 
$
(849
)
 
$
82,279

 
$
(3,320
)
 
$
124,618

 
$
(4,169
)
 
$
206,897
Schedule of amortized cost and fair value of securities, by contractual maturities As of September 30, 2018, the amortized cost and fair value of securities, by contractual maturities, are summarized below. Contractual maturities versus actual maturities may differ due to the effect of prepayments.
Year of Maturity
 
Amortized Cost
 
Estimated Fair Value
2038
 
$
267

 
$
281

2039
 
2,990

 
3,068

2042
 
9,524

 
8,766

2043
 
14,396

 
13,728

2044
 
23,437

 
22,535

2045
 
25,868

 
24,468

2046
 
40,006

 
37,703

2047
 
57,395

 
54,082

2048
 
7,902

 
7,739

Total
 
$
181,785

 
$
172,370