COMMITMENTS AND CONTINGENCIES - Investment holdings schedule (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Summary of Investment Holdings [Line Items]
Amortization Method Qualified Affordable Housing Project Investments	$ 190,332		$ 188,650
Qualified Affordable Housing Project Investments, Commitment	95,739		96,365
Amortization Method Qualified Affordable Housing Project Investments, Amortization	4,939	$ 3,431
Affordable Housing Tax Credits and Other Tax Benefits, Amount	(5,095)	(3,673)
Low Income Housing Tax Credits
Summary of Investment Holdings [Line Items]
Amortization Method Qualified Affordable Housing Project Investments	146,186		142,933
Qualified Affordable Housing Project Investments, Commitment	79,909		80,465
Amortization Method Qualified Affordable Housing Project Investments, Amortization	4,075	3,327
Affordable Housing Tax Credits and Other Tax Benefits, Amount	(4,126)	(3,540)
Historic tax credit [Member]
Summary of Investment Holdings [Line Items]
Amortization Method Qualified Affordable Housing Project Investments	3,749		19,798
Qualified Affordable Housing Project Investments, Commitment	2,088		14,043
Amortization Method Qualified Affordable Housing Project Investments, Amortization	0	0
Affordable Housing Tax Credits and Other Tax Benefits, Amount	0	(80)
New Markets Tax Credit
Summary of Investment Holdings [Line Items]
Amortization Method Qualified Affordable Housing Project Investments	1,754		1,938
Qualified Affordable Housing Project Investments, Commitment	0		0
Amortization Method Qualified Affordable Housing Project Investments, Amortization	31	104
Affordable Housing Tax Credits and Other Tax Benefits, Amount	(1)	(53)
Renewable Energy Program
Summary of Investment Holdings [Line Items]
Amortization Method Qualified Affordable Housing Project Investments	23,845		23,981
Qualified Affordable Housing Project Investments, Commitment	1,787		1,857
Amortization Method Qualified Affordable Housing Project Investments, Amortization	0	0
Affordable Housing Tax Credits and Other Tax Benefits, Amount	0	0
Historic tax credit-Proportional Amort
Summary of Investment Holdings [Line Items]
Amortization Method Qualified Affordable Housing Project Investments	14,798		0
Qualified Affordable Housing Project Investments, Commitment	11,955		$ 0
Amortization Method Qualified Affordable Housing Project Investments, Amortization	833	0
Affordable Housing Tax Credits and Other Tax Benefits, Amount	$ (968)	$ 0