
	At December 31, 2021
(in thousands)	Amortized cost		Gross unrealized gains		Gross unrealized losses		Fair value

AFS
Mortgage-backed securities ("MBS"):
Residential	$	32,905	$	396	$	(338)	$	32,963
Commercial	62,094		933		(235)		62,792
Collateralized mortgage obligations ("CMOs")
Residential	186,703		2,012		(1,321)		187,394
Commercial	135,102		1,890		(333)		136,659
Municipal bonds	516,693		24,154		(924)		539,923
Corporate debt securities	18,918		699		(1)		19,616
U.S. Treasury securities	23,348		—		(173)		23,175

Total	$	975,763	$	30,084	$	(3,325)	$	1,002,522
HTM




Municipal bonds	$	4,169	$	136	$	—	$	4,305


	At December 31, 2020
(in thousands)	Amortized cost		Gross unrealized gains		Gross unrealized losses		Fair value

AFS
MBS:
Residential	$	50,001	$	1,237	$	(192)	$	51,046
Commercial	43,061		2,131		(8)		45,184
CMOs:
Residential	228,685		6,319		(95)		234,909
Commercial	155,645		3,719		(181)		159,183
Municipal bonds	533,719		31,321		(337)		564,703
Corporate debt securities	14,381		841		—		15,222

Agency debentures	1,846		—		—		1,846
Total	$	1,027,338	$	45,568	$	(813)	$	1,072,093
HTM




Municipal bonds	$	4,271	$	236	$	—	$	4,507

MBS and CMOs represent securities primarily issued by government sponsored enterprises ("GSEs"). Most of the MBS and CMO securities in our investment portfolio are guaranteed by Fannie Mae, Ginnie Mae or Freddie Mac. Municipal bonds are comprised of general obligation bonds (i.e., backed by the general credit of the issuer) and revenue bonds (i.e., backed by either collateral or revenues from the specific project being financed) issued by various municipal corporations. As of December 31, 2021 and 2020, all securities held, including municipal bonds and corporate debt securities, were rated investment grade based upon external ratings where available and, where not available, based upon internal ratings which correspond to ratings as defined by Standard and Poor’s Rating Services or Moody's Investors Services.

Investment securities AFS that were in an unrealized loss position are presented in the following tables based on the length of time the individual securities have been in an unrealized loss position:


	At December 31, 2021
	Less than 12 months				12 months or more				Total
(in thousands)	Gross unrealized losses		Fair value		Gross unrealized losses		Fair value		Gross unrealized losses		Fair value

MBS:
Residential	$	(38)	$	5,324	$	(300)	$	2,406	$	(338)	$	7,730
Commercial	(235)		18,127		—		—		(235)		18,127
CMOs:
Residential	(1,007)		53,068		(314)		7,116		(1,321)		60,184
Commercial	(135)		14,806		(198)		5,132		(333)		19,938
Municipal bonds	(914)		64,237		(10)		1,058		(924)		65,295
Corporate debt securities	(1)		3,164		—		—		(1)		3,164
U.S. Treasury securities	(173)		23,175		—		—		(173)		23,175

Total	$	(2,503)	$	181,901	$	(822)	$	15,712	$	(3,325)	$	197,613


	At December 31, 2020
	Less than 12 months				12 months or more				Total
(in thousands)	Gross unrealized losses		Fair value		Gross unrealized losses		Fair value		Gross unrealized losses		Fair value


MBS:
Residential	$	(7)	$	1,196	$	(185)	$	1,432	$	(192)	$	2,628
Commercial	(8)		925		—		—		(8)		925
CMOs:
Residential	(95)		7,391		—		—		(95)		7,391
Commercial	(39)		6,687		(142)		15,358		(181)		22,045
Municipal bonds	(337)		10,512		—		—		(337)		10,512



Total	$	(486)	$	26,711	$	(327)	$	16,790	$	(813)	$	43,501

The Company has evaluated AFS securities that are in an unrealized loss position and has determined that the decline in value is temporary and is related to the change in market interest rates since purchase. The decline in value is not related to any issuer- or industry-specific credit event. The Company has not identified any expected credit losses on its debt securities as of December 31, 2021 and 2020. In addition, as of December 31, 2021 and 2020, the Company had not made a decision to sell any of its debt securities held, nor did the Company consider it more likely than not that it would be required to sell such securities before recovery of their amortized cost basis.


	At December 31, 2021
	Within one year				After one year through five years				After five years through ten years				After ten years				Total
(dollars in thousands)	Fair Value		Weighted Average Yield		Fair Value		Weighted Average Yield		Fair Value		Weighted Average Yield		Fair Value		Weighted Average Yield		Fair Value		Weighted Average Yield

AFS






Municipal bonds	$	4,933	3.79	%	$	14,366	3.26	%	$	68,025	3.60	%	$	452,599	3.23	%	$	539,923	3.28	%
Corporate debt securities	—		—	%	6,563		3.60	%	13,053		5.03	%	—		—	%	19,616		4.55	%
U.S. Treasury securities	—		—	%	—		—	%	23,175		1.27	%	—		—	%	23,175		1.27	%

Total	$	4,933	3.79	%	$	20,929	3.37	%	$	104,253	3.23	%	$	452,599	3.23	%	$	582,714	3.24	%

HTM




Municipal bonds	$	1,684	2.86	%	$	2,621	2.12	%	$	—	—	%	$	—	—	%	$	4,305	2.42	%


	At December 31, 2020
	Within one year				After one year through five years				After five years through ten years				After ten years				Total
(dollars in thousands)	Fair Value		Weighted Average Yield		Fair Value		Weighted Average Yield		Fair Value		Weighted Average Yield		Fair Value		Weighted Average Yield		Fair Value		Weighted Average Yield

AFS






Municipal bonds	$	4,024	3.19	%	$	14,978	3.82	%	$	59,496	3.26	%	$	486,205	3.29	%	$	564,703	3.30	%
Corporate debt securities	183		4.27	%	7,059		3.74	%	7,980		4.78	%	—		—	%	15,222		4.30	%

Agency debentures	—		—	%	—		—	%	—		—	%	1,846		2.68	%	1,846		2.68	%
Total	$	4,207	3.24	%	$	22,037	3.80	%	$	67,476	3.45	%	$	488,051	3.29	%	$	581,771	3.33	%

HTM




Municipal bonds	$	—	—	%	$	4,507	2.47	%	$	—	—	%	$	—	—	%	$	4,507	2.47	%

The weighted-average yield is computed using the contractual coupon for each security weighted based on the fair value of each security and does not include adjustments to a tax equivalent basis. MBS and CMOs are excluded from the tables above because such securities are not due on a single maturity date. The weighted average yield of MBS and CMOs as of December 31, 2021 and 2020 was 1.82% and 1.92%, respectively.

The following table summarizes the carrying value of securities pledged as collateral to secure public deposits, borrowings and other purposes as permitted or required by law.


	At December 31,
(in thousands)	2021		2020


Washington, Oregon and California State to secure public deposits	$	206,153	$	171,471

Other securities pledged	5,258		3,391
Total securities pledged as collateral	$	211,411	$	174,862

The Company assesses the creditworthiness of the counterparties that hold the pledged collateral and has determined that these arrangements have little credit risk. There were no securities pledged under repurchase agreements at December 31, 2021 and 2020.