Debt Securities Held-to-Maturity (Tables)

12 Months Ended

Dec. 31, 2019

Investments, Debt and Equity Securities [Abstract]

Summary of Mortgage-Backed Securities Held-to-Maturity

The following is a summary of mortgage-backed securities held-to-maturity at December 31, 2019 and 2018 (in thousands): 

	2019
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Mortgage-backed securities:
Pass-through certificates:
GSEs	$	8,762	$	129	$	5	$	8,886
Total securities held-to-maturity	$	8,762	$	129	$	5	$	8,886

	2018
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Mortgage-backed securities:
Pass-through certificates:
GSEs	$	9,505	$	—	$	256	$	9,249
Total securities held-to-maturity	$	9,505	$	—	$	256	$	9,249

Held-to-Maturity Securities

Gross unrealized losses on mortgage-backed securities held-to-maturity, and the estimated fair value of the related securities, aggregated by security category and length of time that individual securities have been in a continuous unrealized loss position, at December 31, 2019 and 2018, were as follows (in thousands):

	December 31, 2019
	Less than 12 months				12 months or more				Total
	Unrealized		Estimated		Unrealized		Estimated		Unrealized		Estimated
	losses		fair value		losses		fair value		losses		fair value
Mortgage-backed securities:
Pass-through certificates:
GSEs	$	—	$	—	$	5	$	378	$	5	$	378
Total	$	—	$	—	$	5	$	378	$	5	$	378

	December 31, 2018
	Less than 12 months				12 months or more				Total
	Unrealized		Estimated		Unrealized		Estimated		Unrealized		Estimated
	losses		fair value		losses		fair value		losses		fair value
Mortgage-backed securities:
Pass-through certificates:
GSEs	$	34	$	2,133	$	222	$	7,116	$	256	$	9,249
Total	$	34	$	2,133	$	222	$	7,116	$	256	$	9,249