Investments (Tables)

12 Months Ended

Dec. 31, 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:

	December 31, 2018
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
Available for sale:
Mortgage-backed securities	$	159,937	$	155	$	(5,517	)	$	154,575
Utah Housing Corporation bonds	22,388		23		(741		)	21,670
Total	$	182,325	$	178	$	(6,258	)	$	176,245
	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 loss positions, 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 December 31, 2018:
Mortgage-backed securities	$	(228	)	$	16,948	$	(5,289	)	$	125,537	$	(5,517	)	$	142,485
Utah Housing Corporation bonds	—			—		(741		)	16,647		(741		)	16,647
Total	$	(228	)	$	16,948	$	(6,030	)	$	142,184	$	(6,258	)	$	159,132
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

Amortized cost and fair value of securities by contractual maturities

As of December 31, 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	$	265	$	279
2039	2,963		3,060
2042	8,689		8,156
2043	14,192		13,779
2044	22,132		21,556
2045	23,918		23,005
2046	37,939		36,290
2047	56,376		54,216
2048	15,851		15,904
Total	$	182,325	$	176,245