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Investments (Tables)
 12 Months Ended
Dec. 31, 2016
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:
 
 
 
December 31, 2016
 
 
Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Estimated Fair Value
Available for sale:
 
 
 
 
 
 
 
 
Mortgage-backed securities
 
$
196,406

 
$
929

 
$
(3,042
)
 
$
194,293

Utah Housing Corporation bonds
 
15,000

 
—

 
(690
)
 
14,310

Total
 
$
211,406

 
$
929

 
$
(3,732
)
 
$
208,603

 
 
 
 
 
 
 
 
 
 
 
December 31, 2015
 
 
Amortized Cost
 
Gross Unrealized Gains
 
Gross Unrealized Losses
 
Estimated Fair Value
Available for sale:
 
 
 
 
 
 
 
 
Mortgage-backed securities
 
$
196,402

 
$
1,370

 
$
(2,381
)
 
$
195,391
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 bonds and the estimated fair value 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 December 31, 2016:
 
 
 
 
 
 
 
 
 
 
 
 
Mortgage-backed securities
 
$
(2,423
)
 
$
129,549

 
$
(619
)
 
$
10,885

 
$
(3,042
)
 
$
140,434

Utah Housing Corporation bonds
 
(690
)
 
14,310

 
—

 
—

 
(690
)
 
14,310

Total
 
$
(3,113
)
 
$
143,859

 
$
(619
)
 
$
10,885

 
$
(3,732
)
 
$
154,744

 
 
 
 
 
 
 
 
 
 
 
 
 
As of December 31, 2015:
 
 
 
 
 
 
 
 
 
 
 
 
Mortgage-backed securities
 
$
(827
)
 
$
73,802

 
$
(1,554
)
 
$
39,271

 
$
(2,381
)
 
$
113,073
Amortized Cost and Fair Value of Securities by Contractual Maturities
As of December 31, 2016, 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
 
$
278

 
$
303

2039
 
5,405

 
5,758

2042
 
15,344

 
14,621

2043
 
46,996

 
47,045

2044
 
37,970

 
37,876

2045
 
50,814

 
50,084

2046
 
39,599

 
38,606

2047
 
15,000

 
14,310

Total
 
$
211,406

 
$
208,603