COMMITMENTS AND CONTINGENCIES - Investment holdings schedule (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Summary of Investment Holdings [Line Items]
Amortization Method Qualified Affordable Housing Project Investments	$ 189,698		$ 189,698		$ 188,650
Qualified Affordable Housing Project Investments, Commitment	83,504		83,504		96,365
Amortization Method Qualified Affordable Housing Project Investments, Amortization	4,622	$ 3,559	12,692	$ 10,831
Affordable Housing Tax Credits and Other Tax Benefits, Amount	(5,010)	(3,567)	(15,242)	(10,808)
Low Income Housing Tax Credits
Summary of Investment Holdings [Line Items]
Amortization Method Qualified Affordable Housing Project Investments	147,038		147,038		142,933
Qualified Affordable Housing Project Investments, Commitment	69,971		69,971		80,465
Amortization Method Qualified Affordable Housing Project Investments, Amortization	3,398	3,455	10,506	10,520
Affordable Housing Tax Credits and Other Tax Benefits, Amount	(3,905)	(3,434)	(11,926)	(10,411)
Historic tax credit [Member]
Summary of Investment Holdings [Line Items]
Amortization Method Qualified Affordable Housing Project Investments	3,749		3,749		19,798
Qualified Affordable Housing Project Investments, Commitment	1,347		1,347		14,043
Amortization Method Qualified Affordable Housing Project Investments, Amortization	0	0	0	0
Affordable Housing Tax Credits and Other Tax Benefits, Amount	0	(80)	0	(239)
New Markets Tax Credit
Summary of Investment Holdings [Line Items]
Amortization Method Qualified Affordable Housing Project Investments	1,380		1,380		1,938
Qualified Affordable Housing Project Investments, Commitment	0		0		0
Amortization Method Qualified Affordable Housing Project Investments, Amortization	31	104	94	311
Affordable Housing Tax Credits and Other Tax Benefits, Amount	(1)	(53)	(4)	(158)
Renewable Energy Program
Summary of Investment Holdings [Line Items]
Amortization Method Qualified Affordable Housing Project Investments	23,573		23,573		23,981
Qualified Affordable Housing Project Investments, Commitment	231		231		1,857
Amortization Method Qualified Affordable Housing Project Investments, Amortization	0	0	0	0
Affordable Housing Tax Credits and Other Tax Benefits, Amount	0	0	0	0
Historic tax credit-Proportional Amort
Summary of Investment Holdings [Line Items]
Amortization Method Qualified Affordable Housing Project Investments	13,958		13,958		0
Qualified Affordable Housing Project Investments, Commitment	11,955		11,955		$ 0
Amortization Method Qualified Affordable Housing Project Investments, Amortization	1,193	0	2,092	0
Affordable Housing Tax Credits and Other Tax Benefits, Amount	$ (1,104)	$ 0	$ (3,312)	$ 0