At March 31, 2021 and December 31, 2020, the Company had $244.7 million and $239.0 million, respectively, of term notes issued by SPVs that have acquired rights to receive cash flows representing the servicing fees and/or excess servicing spread associated with certain MSRs. Payment of principal and interest on these term notes is considered to be largely dependent on cash flows generated by the underlying MSRs, as this impacts the cash flows available to the SPV that issued the term notes.

At March 31, 2021, these term notes had an amortized cost of $185.6 million, gross unrealized gains of approximately $59.1 million, a weighted average yield of 12.1% and a weighted average term to maturity of 8.2 years. At December 31, 2020, the term notes had an amortized cost of $184.9 million, gross unrealized gains of approximately $54.0 million, a weighted average yield of 12.30% and a weighted average term to maturity of 8.7 years. During the three months ended March 31, 2020, the Company sold certain term notes for $136.8 million, realizing gains of $24.6 million, respectively. During the three months ended March 31, 2020, the Company recognized an impairment loss related to its term notes of $280.8 million based on its intent to sell, or the likelihood it will be required to sell, such notes.

CRT securities are debt obligations issued by or sponsored by Fannie Mae and Freddie Mac. The coupon payments on CRT securities are paid by the issuer and the principal payments received are dependent on the performance of loans in either a reference pool or an actual pool of loans. As an investor in a CRT security, the Company may incur a principal loss if the performance of the actual or reference pool loans results in either an actual or calculated loss that exceeds the credit enhancement of the security owned by the Company. The Company assesses the credit risk associated with its investments in CRT securities by assessing the current and expected future performance of the associated loan pool. The Company pledges a portion of its CRT securities as collateral against its borrowings under repurchase agreements (see Note 7).

MBS investments held during the year December 31, 2020 or in prior periods included Agency MBS and Non-Agency MBS which include MBS issued prior to 2008 (“Legacy Non-Agency MBS”). These MBS are secured by: (i) hybrid mortgages (“Hybrids”), which have interest rates that are fixed for a specified period of time and, thereafter, generally adjust annually to an increment over a specified interest rate index; (ii) adjustable-rate mortgages (“ARMs”), which have interest rates that reset annually or more frequently (collectively, “ARM-MBS”); and (iii) 15 and 30 year fixed-rate mortgages for Agency MBS and, for Non-Agency MBS, 30-year and longer-term fixed rate mortgages. In addition, the Company’s MBS are also comprised of MBS backed by securitized re-performing/non-performing loans (“RPL/NPL MBS”), where the cash flows of the bond may not reflect the contractual cash flows of the underlying collateral. The Company’s RPL/NPL MBS are generally structured with a contractual coupon step-up feature where the coupon increases from 300 - 400 basis points at 36 - 48 months from issuance or sooner. The Company pledges a significant portion of its MBS as collateral against its borrowings under repurchase agreements (see Note 7).

Agency MBS: Agency MBS are guaranteed as to principal and/or interest by a federally chartered corporation, such as Fannie Mae or Freddie Mac, or an agency of the U.S. Government, such as Ginnie Mae. The payment of principal and/or interest on Ginnie Mae MBS is explicitly backed by the full faith and credit of the U.S. Government. Since the third quarter of 2008, Fannie Mae and Freddie Mac have been under the conservatorship of the Federal Housing Finance Agency, which significantly strengthened the backing for these government-sponsored entities. The Company sold its remaining holdings of Agency MBS during the quarter ended June 30, 2020.

Non-Agency MBS: The Company’s Non-Agency MBS are primarily secured by pools of residential mortgages, which are not guaranteed by an agency of the U.S. Government or any federally chartered corporation. Credit risk associated with Non-Agency MBS is regularly assessed as new information regarding the underlying collateral becomes available and based on updated estimates of cash flows generated by the underlying collateral. During 2020, the Company had sold all of its holdings of Legacy Non-Agency MBS and substantially reduced its holdings of other Non-Agency MBS.


(In Thousands)	Principal/ Current Face		Purchase Premiums		Accretable Purchase Discounts		Discount Designated as Credit Reserve (1)		Gross Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Net Unrealized Gain/(Loss)		Fair Value


Total residential mortgage securities (2)(3)(4)(5)	$	105,487	$	3,764	$	(69)	$	(20,768)	$	88,414	$	17,207	$	(206)	$	17,001	$	105,415


(In Thousands)	Principal/ Current Face		Purchase Premiums		Accretable Purchase Discounts		Discount Designated as Credit Reserve (1)		Gross Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Net Unrealized Gain/(Loss)		Fair Value


Total residential mortgage securities (2)(3)(4)(5)	$	161,878	$	3,022	$	(8,206)	$	(21,437)	$	135,257	$	26,926	$	(1,183)	$	25,743	$	161,000

(3)Includes RPL/NPL MBS, which at March 31, 2021 had an $1.6 million Principal/Current face, $1.6 million amortized cost and $1.6 million fair value. At December 31, 2020, RPL/NPL MBS had a $55.0 million Principal/Current face, $46.9 million amortized cost and $53.9 million fair value.

(5)Amounts disclosed at March 31, 2021 includes CRT securities with a fair value of $66.2 million for which the fair value option has been elected. Such securities had $535,000 gross unrealized gains and gross unrealized losses of approximately $206,000 at March 31, 2021. Amounts disclosed at December 31, 2020 includes CRT securities with a fair value of $66.2 million for which the fair value option has been elected. Such securities had gross unrealized gains of approximately $551,000 and gross unrealized losses of approximately $322,000 at December 31, 2020.


	Three Months Ended March 31, 2021				Three Months Ended March 31, 2020
(In Thousands)	Sales Proceeds		Gains/(Losses)		Sales Proceeds		Gains/(Losses)
Agency MBS	$	—	$	—	$	965,132	$	(22,854)
Non-Agency MBS	—		—		264,385		(43,124)
CRT Securities	—		—		35,645		(2,017)
Total	$	—	$	—	$	1,265,162	$	(67,995)

The Company did not recognize an allowance for credit losses (or other than temporary impairment in prior year periods) through earnings related to its MBS for the three months ended March 31, 2021. During the three months ended March 31, 2020, the Company recognized an aggregate impairment loss related to its MBS of $63.5 million based on its intent to sell, or the likelihood it will be required to sell, certain securities at such time.


	Three Months Ended March 31,
(Dollars In Thousands)	2021		2020
Allowance for credit losses at beginning of period	$	—	$	—
Current provision:	—		—
Securities with no prior loss allowance	—		344,269
Securities with a prior loss allowance	—		—
Write-offs, including allowance related to securities the Company intended to sell	—		(344,269)
Allowance for credit losses at end of period	$	—	$	—


	Three Months Ended March 31,
(In Thousands)	2021		2020
AOCI from AFS securities:
Unrealized gain on AFS securities at beginning of period	$	79,607	$	392,722
Unrealized (losses)/gains on securities available-for-sale	(3,855)		124,410
Reclassification adjustment for MBS sales included in net income	—		(23,953)
Reclassification adjustment for impairment included in net income	—		(344,269)
Change in AOCI from AFS securities	(3,855)		(243,812)
Balance at end of period	$	75,752	$	148,910


	Three Months Ended March 31,
(In Thousands)	2021		2020
Agency MBS
Coupon interest	$	—	$	13,636
Effective yield adjustment (1)	—		(4,775)
Interest income	$	—	$	8,861

Legacy Non-Agency MBS
Coupon interest	$	14	$	17,282
Effective yield adjustment (2)(3)	670		9,406
Interest income	$	684	$	26,688

RPL/NPL MBS
Coupon interest	$	352	$	5,583
Effective yield adjustment (1)(4)	8,135		280
Interest income	$	8,487	$	5,863

CRT securities
Coupon interest	$	921	$	3,485
Effective yield adjustment (2)	744		(523)
Interest income	$	1,665	$	2,962

MSR-related assets
Coupon interest	$	2,405	$	14,207
Effective yield adjustment (1)(2)	3,218		—
Interest income	$	5,623	$	14,207

(1) Includes amortization of premium paid net of accretion of purchase discount. For Agency MBS, RPL/NPL MBS and the corporate loan secured by MSRs, interest income is recorded at an effective yield, which reflects net premium amortization/accretion based on actual prepayment activity.

(2) The effective yield adjustment is the difference between the net income calculated using the net yield less the current coupon yield. The net yield may be based on management’s estimates of the amount and timing of future cash flows or in the instrument’s contractual cash flows, depending on the relevant accounting standards.