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INVESTMENT SECURITIES
6 Months Ended
Jun. 30, 2023
Investments, Debt and Equity Securities [Abstract]  
INVESTMENT SECURITIES INVESTMENT SECURITIES:
The following table sets forth certain information regarding the amortized cost basis and fair values of our investment securities AFS and held-to-maturity ("HTM"): 
At June 30, 2023
(in thousands)Amortized
cost
Gross
unrealized
gains
Gross
unrealized
losses
Fair
value
AFS
Mortgage backed securities ("MBS"):
Residential$203,781 $25 $(12,188)$191,618 
Commercial62,412 — (9,181)53,231 
Collateralized mortgage obligations ("CMOs"):
Residential559,765 — (41,574)518,191 
Commercial73,078 — (6,724)66,354 
Municipal bonds459,416 108 (53,979)405,545 
Corporate debt securities45,717 — (6,694)39,023 
U.S. Treasury securities22,833 — (2,965)19,868 
Agency debentures61,110 — (742)60,368 
Total$1,488,112 $133 $(134,047)$1,354,198 
HTM
   Municipal bonds$2,406 $— $(69)$2,337 

At December 31, 2022
(in thousands)Amortized
cost
Gross
unrealized
gains
Gross
unrealized
losses
Fair
value
AFS
MBS:
Residential$207,445 $— $(10,183)$197,262 
Commercial65,411 — (9,362)56,049 
CMOs:
Residential592,449 12 (39,422)553,039 
Commercial77,909 — (7,390)70,519 
 Municipal bonds469,346 41 (57,839)411,548 
 Corporate debt securities46,672 74 (3,801)42,945 
 U.S. Treasury securities23,005 — (3,071)19,934 
 Agency debentures27,499 (29)27,478 
Total$1,509,736 $135 $(131,097)$1,378,774 
HTM
   Municipal bonds
$2,441 $— $(56)$2,385 

At June 30, 2023, and December 31, 2022, the Company held $40 million and $19 million, respectively, of trading securities, consisting of US Treasury notes used as economic hedges of our mortgage servicing rights, which are carried at fair value and included with investment securities on the balance sheet. For the quarters ended June 30, 2023 and 2022, net losses of $1.1 million and $3.1 million on trading securities, respectively, and for the six months ended June 30, 2023 and 2022, net losses of $0.4 million and $3.9 million on trading securities, respectively, were recorded in servicing income.

MBS and CMOs represent securities 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 June 30, 2023 and December 31, 2022, substantially all securities held, including municipal bonds and corporate debt securities, were rated investment grade based upon nationally recognized statistical rating organizations where available and, where not available, based upon internal ratings.

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 June 30, 2023
 Less than 12 months12 months or moreTotal
(in thousands)Gross
unrealized
losses
Fair
value
Gross
unrealized
losses
Fair
value
Gross
unrealized
losses
Fair
value
AFS
MBS:
Residential
$(7,946)$148,365 $(4,242)$36,814 $(12,188)$185,179 
Commercial— 64 (9,181)52,170 (9,181)52,234 
CMOs:
Residential(6,616)267,804 (34,958)250,387 (41,574)518,191 
Commercial(151)8,144 (6,573)58,210 (6,724)66,354 
Municipal bonds(990)34,143 (52,989)353,633 (53,979)387,776 
Corporate debt securities(829)14,171 (5,865)24,852 (6,694)39,023 
U.S. Treasury securities— — (2,965)19,868 (2,965)19,868 
Agency debentures(459)58,077 (283)2,291 (742)60,368 
Total$(16,991)$530,768 $(117,056)$798,225 $(134,047)$1,328,993 
HTM
Municipal bonds$(69)$2,337 $— $— $(69)$2,337 

At December 31, 2022
 Less than 12 months12 months or moreTotal
(in thousands)Gross
unrealized
losses
Fair
value
Gross
unrealized
losses
Fair
value
Gross
unrealized
losses
Fair
value
AFS
MBS:
Residential$(8,845)$191,398 $(1,338)$5,763 $(10,183)$197,161 
Commercial(5,729)41,416 (3,633)14,619 (9,362)56,035 
CMOs:
Residential(27,789)498,333 (11,633)45,689 (39,422)544,022 
Commercial(4,787)56,671 (2,603)13,848 (7,390)70,519 
Municipal bonds(44,513)350,918 (13,326)46,377 (57,839)397,295 
Corporate debt securities(3,801)32,871 — — (3,801)32,871 
U.S. Treasury securities— — (3,071)19,934 (3,071)19,934 
Agency debentures(29)15,970 — — (29)15,970 
Total$(95,493)$1,187,577 $(35,604)$146,230 $(131,097)$1,333,807 
HTM
Municipal bonds$(56)$2,385 $— $— $(56)$2,385 

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 June 30,
2023 or December 31, 2022. In addition, as of June 30, 2023 and December 31, 2022, 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.

The following tables present the fair value of investment securities AFS and HTM by contractual maturity along with the associated contractual yield:
 At June 30, 2023
 Within one yearAfter 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$35 2.65 %$3,722 2.00 %$55,618 3.02 %$346,170 2.70 %$405,545 2.74 %
   Corporate debt securities
4,439 3.47 %9,933 5.96 %24,651 3.82 %— — %39,023 4.25 %
   U.S. Treasury securities
— — %— — %19,868 1.12 %— — %19,868 1.12 %
   Agency debentures15,442 4.72 %42,635 5.09 %2,291 2.04 %— — %60,368 4.87 %
Total$19,916 4.44 %$56,290 5.02 %$102,428 2.84 %$346,170 2.70 %$524,804 3.01 %
HTM
   Municipal bonds$— — %$2,337 1.81 %$— — %$— — %$2,337 1.81 %

 At December 31, 2022
 Within one yearAfter 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
$— — %$3,644 1.96 %$38,977 3.04 %$368,927 2.83 %$411,548 2.84 %
   Corporate debt securities
— — %15,342 5.13 %27,603 4.25 %— — %42,945 4.54 %
   U.S. Treasury securities
— — %— — %19,934 1.11 %— — %19,934 1.11 %
Agency debentures10,485 4.74 %16,993 4.94 %— — %— — %27,478 4.86 %
Total$10,485 4.74 %$35,979 4.69 %$86,514 2.97 %$368,927 2.83 %$501,905 3.01 %
HTM
   Municipal bonds$— — %$2,385 2.04 %$— — %$— — %$2,385 2.04 %

The weighted-average yield is computed using the contractual coupon of each security weighted based on the fair value of each security. 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 June 30, 2023 and December 31, 2022 was 3.12% and 3.08%, respectively.

Sales of AFS investment securities were as follows:

Quarter Ended June 30,Six Months Ended June 30,
(in thousands)2023202220232022
Proceeds$— $— $4,693 $962 
Gross gains— — 71 
Gross losses— — — — 
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:

(in thousands)At June 30, 2023At December 31, 2022
Federal Reserve Bank to secure borrowings$644,636 $— 
Washington, Oregon and California to secure public deposits10,655 212,806 
Other securities pledged1,496 2,011 
Total securities pledged as collateral$656,787 $214,817 

The Company assesses the creditworthiness of the counterparties that hold the pledged collateral and has determined that these arrangements have little credit risk.
Tax-exempt interest income on investment securities was $2.8 million and $3.1 million for the quarters ended June 30, 2023 and 2022, respectively and $5.6 million and $5.8 million for the six months ended June 30, 2023 and 2022, respectively.