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INVESTMENT SECURITIES (Tables)
 6 Months Ended
Jun. 30, 2025
Investments, Debt and Equity Securities [Abstract]  
Amortized Cost and Fair Value of Available-for-Sale 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, 2025
(in thousands)Amortized
cost		Gross
unrealized
gains		Gross
unrealized
losses		Fair
value
AFS
Mortgage backed securities ("MBS"):
Residential$164,411 $201 $(4,652)$159,960 
Commercial54,248 — (5,405)48,843 
Collateralized mortgage obligations ("CMOs"):
Residential325,145 44 (24,475)300,714 
Commercial56,190 — (3,945)52,245 
Municipal bonds426,258 107 (54,783)371,582 
Corporate debt securities31,121 — (5,575)25,546 
U.S. Treasury securities22,129 — (1,631)20,498 
Agency debentures9,448 — (735)8,713 
Total$1,088,950 $352 $(101,201)$988,101 
HTM
   Municipal bonds$2,265 $— $(12)$2,253 

At December 31, 2024
(in thousands)Amortized
cost		Gross
unrealized
gains		Gross
unrealized
losses		Fair
value
AFS
MBS:
Residential$174,887 $229 $(7,654)$167,462 
Commercial54,620 — (6,978)47,642 
CMOs:
Residential349,348 36 (31,940)317,444 
Commercial59,725 14 (4,794)54,945 
 Municipal bonds433,162 95 (54,998)378,259 
 Corporate debt securities31,136 — (6,192)24,944 
 U.S. Treasury securities22,306 — (2,319)19,987 
 Agency debentures10,320 — (1,044)9,276 
Total$1,135,504 $374 $(115,919)$1,019,959 
HTM
   Municipal bonds
$2,301 $— $(28)$2,273 
Amortized Cost and Fair Value of Held-to-Maturity 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, 2025
(in thousands)Amortized
cost		Gross
unrealized
gains		Gross
unrealized
losses		Fair
value
AFS
Mortgage backed securities ("MBS"):
Residential$164,411 $201 $(4,652)$159,960 
Commercial54,248 — (5,405)48,843 
Collateralized mortgage obligations ("CMOs"):
Residential325,145 44 (24,475)300,714 
Commercial56,190 — (3,945)52,245 
Municipal bonds426,258 107 (54,783)371,582 
Corporate debt securities31,121 — (5,575)25,546 
U.S. Treasury securities22,129 — (1,631)20,498 
Agency debentures9,448 — (735)8,713 
Total$1,088,950 $352 $(101,201)$988,101 
HTM
   Municipal bonds$2,265 $— $(12)$2,253 

At December 31, 2024
(in thousands)Amortized
cost		Gross
unrealized
gains		Gross
unrealized
losses		Fair
value
AFS
MBS:
Residential$174,887 $229 $(7,654)$167,462 
Commercial54,620 — (6,978)47,642 
CMOs:
Residential349,348 36 (31,940)317,444 
Commercial59,725 14 (4,794)54,945 
 Municipal bonds433,162 95 (54,998)378,259 
 Corporate debt securities31,136 — (6,192)24,944 
 U.S. Treasury securities22,306 — (2,319)19,987 
 Agency debentures10,320 — (1,044)9,276 
Total$1,135,504 $374 $(115,919)$1,019,959 
HTM
   Municipal bonds
$2,301 $— $(28)$2,273 
Unrealized Gain (Loss) on Investments
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, 2025
 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
$(2)$526 $(4,650)$151,754 $(4,652)$152,280 
Commercial— — (5,405)48,843 (5,405)48,843 
CMOs:
Residential(13)11,685 (24,462)268,109 (24,475)279,794 
Commercial(1)3,067 (3,944)49,178 (3,945)52,245 
Municipal bonds(349)15,285 (54,434)343,646 (54,783)358,931 
Corporate debt securities— — (5,575)25,546 (5,575)25,546 
U.S. Treasury securities— — (1,631)20,498 (1,631)20,498 
Agency debentures— — (735)8,713 (735)8,713 
Total$(365)$30,563 $(100,836)$916,287 $(101,201)$946,850 
HTM
Municipal bonds$— $— $(12)$2,253 $(12)$2,253 
At December 31, 2024
 Less than 12 months12 months or moreTotal
(in thousands)Gross
unrealized
losses		Fair
value		Gross
unrealized
losses		Fair
value		Gross
unrealized
losses		Fair
value
AFS
MBS:
Residential$(2)$532 $(7,652)$158,044 $(7,654)$158,576 
Commercial— — (6,978)47,642 (6,978)47,642 
CMOs:
Residential(78)7,481 (31,862)293,297 (31,940)300,778 
Commercial— — (4,794)51,834 (4,794)51,834 
Municipal bonds(810)28,361 (54,188)340,571 (54,998)368,932 
Corporate debt securities— — (6,192)24,944 (6,192)24,944 
U.S. Treasury securities— — (2,319)19,987 (2,319)19,987 
Agency debentures— — (1,044)9,276 (1,044)9,276 
Total$(890)$36,374 $(115,029)$945,595 $(115,919)$981,969 
HTM
Municipal bonds$— $— $(28)$2,273 $(28)$2,273 
Computation of Weighted Average Yield using Coupon on the Fair Value
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, 2025
 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$— — %$39,308 3.54 %$55,342 2.99 %$276,932 2.89 %$371,582 2.97 %
   Corporate debt securities
— — %2,327 1.74 %23,219 4.44 %— — %25,546 4.20 %
   U.S. Treasury securities
— — %20,498 1.19 %— — %— — %20,498 1.19 %
   Agency debentures— — %1,587 2.17 %4,031 2.22 %3,095 2.21 %8,713 2.21 %
Total$— — %$63,720 2.69 %$82,592 3.36 %$280,027 2.88 %$426,339 2.95 %
HTM
   Municipal bonds2,2532.31 %$— — %$— — %$— — %$2,253 2.31 %
 At December 31, 2024
 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
$— — %$15,531 3.88 %$70,678 2.92 %$292,050 2.93 %$378,259 2.97 %
   Corporate debt securities
— — %2,735 2.08 %22,209 4.27 %— — %$24,944 4.03 %
   U.S. Treasury securities
— — %19,987 1.15 %— — %— — %$19,987 1.15 %
Agency debentures— — %1,770 2.13 %4,442 2.17 %3,064 2.14 %$9,276 2.15 %
Total$— — %$40,023 2.32 %$97,329 3.19 %$295,114 2.92 %$432,466 2.93 %
HTM
   Municipal bonds$2,273 2.29 %$— — %$— — %$— — %$2,273 2.29 %
Carrying Value of Securities Pledged as Collateral
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, 2025At December 31, 2024
Federal Reserve Bank to secure borrowings$864,307 $906,475 
Washington, Oregon and California to secure public deposits195,385 195,212 
Other securities pledged1,278 1,334 
Total securities pledged as collateral$1,060,970 $1,103,021