
			December 31, 2020								December 31, 2019
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value		Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
(dollars in thousands)
U.S. Government Sponsored Enterprises	$	244,220	$	389	$	866	$	243,743	$	98,867	$	527	$	96	$	99,298
SBA Backed Securities		37,783		2,002		—		39,785		44,379		182		303		44,258
U.S. Government Sponsored Enterprises Mortgage-Backed Securities		2,227,085		69,522		1,032		2,295,575		2,207,874		20,720		10,846		2,217,748

Total	$	2,509,088	$	71,913	$	1,898	$	2,579,103	$	2,351,120	$	21,429	$	11,245	$	2,361,304

Included in U.S. Government Sponsored Enterprises and U.S. Government Sponsored Enterprise Mortgage-Backed Securities are securities pledged to secure public deposits and repurchase agreements at fair value amounting to $1,866,989,000 and $1,776,399,000 at December 31, 2020, and 2019, respectively. Also included are securities pledged for borrowing at the Federal Home Loan Bank at fair value amounting to $537,367,000 and $399,646,000 at December 31, 2020, and 2019, respectively. The Company did not realize any gains of sales of securities for the year ending December 31, 2020. The Company realized gains on sales of securities of $48,000 from the proceeds of sales of

held-to-maturity

securities of $1,193,000 for the year ending December 31, 2019. The sales from securities

held-to-maturity

relate to certain mortgage-backed securities for which the Company had previously collected a substantial portion of its principle investment. The Company did not realize any gains of sales of securities for the year ending December 31, 2018.