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INVESTMENT SECURITIES (Tables)
 6 Months Ended
Jun. 30, 2022
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, 2022
(in thousands)Amortized
cost		Gross
unrealized
gains		Gross
unrealized
losses		Fair
value
AFS
Mortgage backed securities ("MBS"):
Residential$131,458 $137 $(2,664)$128,931 
Commercial70,076 — (6,503)63,573 
Collateralized mortgage obligations ("CMOs"):
Residential314,451 175 (18,577)296,049 
Commercial131,781 75 (5,265)126,591 
Municipal bonds582,262 826 (47,735)535,353 
Corporate debt securities31,792 — (1,462)30,330 
U.S. Treasury securities23,178 — (2,248)20,930 
Total$1,284,998 $1,213 $(84,454)$1,201,757 
HTM
   Municipal bonds$3,118 $3 $(32)$3,089 

At December 31, 2021
(in thousands)Amortized
cost		Gross
unrealized
gains		Gross
unrealized
losses		Fair
value
AFS
MBS:
Residential$32,905 $396 $(338)$32,963 
Commercial62,094 933 (235)62,792 
CMOs:
Residential186,703 2,012 (1,321)187,394 
Commercial135,102 1,890 (333)136,659 
 Municipal bonds516,693 24,154 (924)539,923 
 Corporate debt securities18,918 699 (1)19,616 
   U.S. Treasury securities23,348 — (173)23,175 
Total$975,763 $30,084 $(3,325)$1,002,522 
HTM
   Municipal bonds
$4,169 $136 $— $4,305 
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, 2022
(in thousands)Amortized
cost		Gross
unrealized
gains		Gross
unrealized
losses		Fair
value
AFS
Mortgage backed securities ("MBS"):
Residential$131,458 $137 $(2,664)$128,931 
Commercial70,076 — (6,503)63,573 
Collateralized mortgage obligations ("CMOs"):
Residential314,451 175 (18,577)296,049 
Commercial131,781 75 (5,265)126,591 
Municipal bonds582,262 826 (47,735)535,353 
Corporate debt securities31,792 — (1,462)30,330 
U.S. Treasury securities23,178 — (2,248)20,930 
Total$1,284,998 $1,213 $(84,454)$1,201,757 
HTM
   Municipal bonds$3,118 $3 $(32)$3,089 

At December 31, 2021
(in thousands)Amortized
cost		Gross
unrealized
gains		Gross
unrealized
losses		Fair
value
AFS
MBS:
Residential$32,905 $396 $(338)$32,963 
Commercial62,094 933 (235)62,792 
CMOs:
Residential186,703 2,012 (1,321)187,394 
Commercial135,102 1,890 (333)136,659 
 Municipal bonds516,693 24,154 (924)539,923 
 Corporate debt securities18,918 699 (1)19,616 
   U.S. Treasury securities23,348 — (173)23,175 
Total$975,763 $30,084 $(3,325)$1,002,522 
HTM
   Municipal bonds
$4,169 $136 $— $4,305 
Investment Securities in an Unrealized Loss Position
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, 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
$(2,106)$60,558 $(558)$2,089 $(2,664)$62,647 
Commercial(6,503)63,553 — — (6,503)63,553 
CMOs:
Residential(14,699)263,668 (3,878)19,095 (18,577)282,763 
Commercial(4,410)98,776 (855)7,267 (5,265)106,043 
Municipal bonds(44,369)449,658 (3,366)10,638 (47,735)460,296 
Corporate debt securities(1,462)30,259 — — (1,462)30,259 
U.S. Treasury securities(2,248)20,930 — — (2,248)20,930 
Total$(75,797)$987,402 $(8,657)$39,089 $(84,454)$1,026,491 
HTM
Municipal bonds$(32)$2,443 $— $— $(32)$2,443 

At December 31, 2021
 Less than 12 months12 months or moreTotal
(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 
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, 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$4,122 3.55 %$16,348 3.02 %$73,618 3.46 %$441,265 2.99 %$535,353 3.05 %
   Corporate debt securities
— — %5,463 3.50 %24,867 4.34 %— — %30,330 4.20 %
   U.S. Treasury securities
— — %— — %20,930 1.16 %— — %20,930 1.16 %
Total$4,122 3.55 %$21,811 3.14 %$119,415 3.22 %$441,265 2.99 %$586,613 3.04 %
HTM
   Municipal bonds$646 3.49 %$2,443 2.06 %$— — %$— — %$3,089 2.35 %


 At December 31, 2021
 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
$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 %
Schedule of Sales of Investment Securities
Sales of AFS investment securities were as follows:

Quarter Ended June 30,Six Months Ended June 30,
(in thousands)2022202120222021
Proceeds$— $28,187 $962 $28,187 
Gross gains— 288 71 288 
Gross losses— (226)— (226)
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, 2022At December 31, 2021
Washington, Oregon and California to secure public deposits$195,497 $206,153 
Other securities pledged4,787 5,258 
Total securities pledged as collateral$200,284 $211,411