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ALLOWANCE FOR CREDIT LOSSES ON LOANS AND FINANCE LEASES - Carrying Amount of Portfolios (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2020	Dec. 31, 2021	Mar. 31, 2021
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost of loans	$ 11,097,705		$ 11,060,658
Allowance for credit losses	$ 245,447	$ 385,887	269,030	$ 358,936
Allowance for loan and lease losses, numerator [Member] | Amortized cost, denominator [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses to amortized cost	2.21%	2.43%
Residenital Mortgage Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost of loans	$ 2,891,699		2,978,895
Allowance for credit losses	$ 68,820	$ 120,311	74,837	114,044
Residenital Mortgage Loans [Member] | Allowance for loan and lease losses, numerator [Member] | Amortized cost, denominator [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses to amortized cost	2.38%	2.51%
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost of loans	$ 2,880,256		2,887,251
Allowance for credit losses	$ 36,784	$ 37,944	34,284	32,087
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] | Allowance for loan and lease losses, numerator [Member] | Amortized cost, denominator [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses to amortized cost	1.28%	1.19%
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost of loans	$ 2,237,702		2,167,469
Allowance for credit losses	$ 30,138	$ 109,342	52,771	99,782
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | Allowance for loan and lease losses, numerator [Member] | Amortized cost, denominator [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses to amortized cost	1.35%	2.43%
Commercial Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost of loans	$ 111,908		138,999
Allowance for credit losses	$ 1,842	$ 5,380	4,048	4,915
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Allowance for loan and lease losses, numerator [Member] | Amortized cost, denominator [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses to amortized cost	1.65%	2.91%
Consumer Portfolio Segment [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Amortized cost of loans	$ 2,976,140		2,888,044
Allowance for credit losses	$ 107,863	$ 112,910	$ 103,090	$ 108,108
Consumer Portfolio Segment [Member] | Allowance for loan and lease losses, numerator [Member] | Amortized cost, denominator [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses to amortized cost	3.62%	3.57%

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