INVESTMENTS (Narrative) (Detail) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended
	Jun. 30, 2022	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Schedule of Investments [Line Items]
Trading securities		$ 3,971		$ 3,990
AFS debt securities, allowance		0		0
Net unrealized loss on debt securities, net of tax		71,600		79,400
Deferred tax assets, unrealized losses on available for sale securities		19,600		21,700
Provision for credit losses, HTM debt securities		1,800	$ 0
Write off, accrued interest, HTM debt securities		8
HTM debt securities, allowance		0		0
HTM debt securities, excluding accrued interest from amortized cost		1,500		1,700
Asset Pledged as Collateral
Schedule of Investments [Line Items]
AFS and HTM debt securities, amortized cost		630,200		821,900
AFS and HTM debt securities, fair value		560,300		726,500
Available-for-sale Securities
Schedule of Investments [Line Items]
Interest receivable		2,000		1,900
Transferred Securities
Schedule of Investments [Line Items]
AFS debt securities transferred to HTM, fair value	$ 520,300
AFS debt securities, transfer, unrealized loss	$ 72,100
Net unrealized loss on debt securities, net of tax		(50,900)		(52,200)
Deferred tax assets, unrealized losses on available for sale securities		$ 13,900		$ 14,300