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LOANS AND CREDIT QUALITY - Gross Charge-offs by Year and Type (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing receivable, year one, Gross charge-offs $ 0   $ 0
Financing receivable, year two, Gross charge-offs 0   (106)
Financing receivable, year three, Gross charge-offs (2)   (206)
Financing receivable, year four, Gross charge-offs 0   0
Financing receivable, year five, Gross charge-offs 0   (1,136)
Financing receivable, prior to year five, Gross charge-offs, net (1,081)   291
Revolving (22)   (174)
Revolving-term 0   (50)
Charge-offs (1,105) $ (683) (1,381)
Commercial loans | Commercial business      
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing receivable, year one, Gross charge-offs 0   0
Financing receivable, year two, Gross charge-offs 0   0
Financing receivable, year three, Gross charge-offs 0   (184)
Financing receivable, year four, Gross charge-offs 0   0
Financing receivable, year five, Gross charge-offs 0   (1,136)
Financing receivable, prior to year five, Gross charge-offs, net (1,081)   295
Revolving, net 0   13
Revolving-term 0   (50)
Charge-offs (1,081) (633) (1,062)
Consumer loans      
Financing Receivable, Credit Quality Indicator [Line Items]      
Charge-offs (24) (50)  
Consumer loans | Single family      
Financing Receivable, Credit Quality Indicator [Line Items]      
Charge-offs 0 0  
Consumer loans | Home equity and other      
Financing Receivable, Credit Quality Indicator [Line Items]      
Financing receivable, year one, Gross charge-offs 0   0
Financing receivable, year two, Gross charge-offs 0   (106)
Financing receivable, year three, Gross charge-offs (2)   (22)
Financing receivable, year four, Gross charge-offs 0   0
Financing receivable, year five, Gross charge-offs 0   0
Financing receivable, prior to year five, Gross charge-offs 0   (4)
Revolving (22)   (187)
Revolving-term 0   0
Charge-offs $ (24) $ (50) $ (319)