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LOANS AND CREDIT QUALITY - Loan Modifications (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2022
Consumer loans | Single family | Significant Payment Delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis at Period End	$ 682	$ 1,209
% of Total Class of Financing Receivable	0.08%	0.13%
Consumer loans | Single family | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis at Period End	$ 0	$ 270
% of Total Class of Financing Receivable	0.00%	0.03%
Consumer loans | Single family | Interest Rate Reduction and Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis at Period End	$ 0	$ 819
% of Total Class of Financing Receivable	0.00%	0.09%
Consumer loans | Single family | Significant Payment Delay and Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis at Period End	$ 4,033	$ 13,325
% of Total Class of Financing Receivable	0.44%	1.47%
Consumer loans | Single family | Interest Rate Reduction, Significant Payment Delay and Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis at Period End	$ 294	$ 7,185
% of Total Class of Financing Receivable	0.03%	0.79%
Consumer loans | Home equity and other | Significant Payment Delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis at Period End	$ 0	$ 70
% of Total Class of Financing Receivable	0.00%	0.02%
Consumer loans | Home equity and other | Significant Payment Delay and Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis at Period End	$ 0	$ 51
% of Total Class of Financing Receivable	0.00%	0.01%
Commercial loans, adjusted for credit analysis | Commercial business | Term Extension
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis at Period End	$ 0	$ 1,570
% of Total Class of Financing Receivable	0.00%	0.43%
Commercial loans, adjusted for credit analysis | Commercial business | Interest Rate Reduction and Significant Payment Delay
Financing Receivable, Troubled Debt Restructuring [Line Items]
Amortized Cost Basis at Period End	$ 477	$ 477
% of Total Class of Financing Receivable	0.13%	0.13%

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- Definition

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