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INVESTMENT SECURITIES (Tables)
 9 Months Ended
Sep. 30, 2023
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 September 30, 2023
(in thousands)Amortized
cost		Gross
unrealized
gains		Gross
unrealized
losses		Fair
value
AFS
Mortgage backed securities ("MBS"):
Residential$198,589 $48 $(15,668)$182,969 
Commercial57,481 — (9,918)47,563 
Collateralized mortgage obligations ("CMOs"):
Residential526,683 — (47,127)479,556 
Commercial65,686 — (6,934)58,752 
Municipal bonds455,467 106 (77,275)378,298 
Corporate debt securities45,664 — (6,696)38,968 
U.S. Treasury securities22,746 — (3,301)19,445 
Agency debentures67,133 — (2,030)65,103 
Total$1,439,449 $154 $(168,949)$1,270,654 
HTM
   Municipal bonds$2,389 $— $(96)$2,293 

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 8 (29)27,478 
Total$1,509,736 $135 $(131,097)$1,378,774 
HTM
   Municipal bonds
$2,441 $— $(56)$2,385 
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 September 30, 2023
(in thousands)Amortized
cost		Gross
unrealized
gains		Gross
unrealized
losses		Fair
value
AFS
Mortgage backed securities ("MBS"):
Residential$198,589 $48 $(15,668)$182,969 
Commercial57,481 — (9,918)47,563 
Collateralized mortgage obligations ("CMOs"):
Residential526,683 — (47,127)479,556 
Commercial65,686 — (6,934)58,752 
Municipal bonds455,467 106 (77,275)378,298 
Corporate debt securities45,664 — (6,696)38,968 
U.S. Treasury securities22,746 — (3,301)19,445 
Agency debentures67,133 — (2,030)65,103 
Total$1,439,449 $154 $(168,949)$1,270,654 
HTM
   Municipal bonds$2,389 $— $(96)$2,293 

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 8 (29)27,478 
Total$1,509,736 $135 $(131,097)$1,378,774 
HTM
   Municipal bonds
$2,441 $— $(56)$2,385 
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 September 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
$(37)$1,601 $(15,631)$175,779 $(15,668)$177,380 
Commercial— 63 (9,918)47,500 (9,918)47,563 
CMOs:
Residential(581)110,423 (46,546)369,133 (47,127)479,556 
Commercial(12)4,045 (6,922)54,707 (6,934)58,752 
Municipal bonds(2,397)30,863 (74,878)341,014 (77,275)371,877 
Corporate debt securities(44)9,956 (6,652)29,012 (6,696)38,968 
U.S. Treasury securities— — (3,301)19,445 (3,301)19,445 
Agency debentures(455)54,078 (1,575)11,025 (2,030)65,103 
Total$(3,526)$211,029 $(165,423)$1,047,615 $(168,949)$1,258,644 
HTM
Municipal bonds$— $— $(96)$2,293 $(96)$2,293 

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)$2,385 
Computation of Weighted Average Yield using Coupon on the Fair Value
The following tables present the fair value of investment securities AFS and HTM by contractual maturity along with the associated contractual yield:
 At September 30, 2023
 Within one yearAfter one year
through five years		After five years
through ten years		After
ten years		Total
(dollars in thousands)Fair
Value		Weighted
Average
Yield		Fair
Value		Weighted
Average
Yield		Fair
Value		Weighted
Average
Yield		Fair
Value		Weighted
Average
Yield		Fair
Value		Weighted
Average
Yield
AFS          
   Municipal bonds$— — %$5,669 1.78 %$53,217 3.00 %$319,412 2.51 %$378,298 2.56 %
   Corporate debt securities
4,441 3.51 %13,600 5.26 %20,927 3.80 %— — %38,968 4.25 %
   U.S. Treasury securities
— — %4,618 1.14 %14,827 1.08 %— — %19,445 1.10 %
   Agency debentures18,430 4.91 %35,648 5.13 %7,887 2.09 %3,138 1.95 %65,103 4.49 %
Total$22,871 4.64 %$59,535 4.48 %$96,858 2.82 %$322,550 2.50 %$501,814 2.85 %
HTM
   Municipal bonds$— — %$2,293 1.79 %$— — %$— — %$2,293 1.79 %

 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 %$501,905 3.01 %
HTM
   Municipal bonds$— — %$2,385 2.04 %$— — %$— — %$2,385 2.04 %
Schedule of Sales of Investment Securities
Sales of AFS investment securities were as follows:
Quarter Ended September 30,Nine Months Ended September 30,
(in thousands)2023202220232022
Proceeds$— $74,399 $4,693 $75,361 
Gross gains— 1,334 3 1,405 
Gross losses— (1,381)— (1,381)
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 September 30, 2023At December 31, 2022
Federal Reserve Bank to secure borrowings$647,933 $— 
Washington, Oregon and California to secure public deposits10,655 212,806 
Other securities pledged1,466 2,011 
Total securities pledged as collateral$660,054 $214,817