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ALLOWANCE FOR CREDIT LOSSES FOR LOANS AND FINANCE LEASES - Carrying Amount of Portfolios (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020	Jun. 30, 2021	Sep. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Financing Receivable Allowance For Credit Losses [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 11,140,582	$ 11,777,289
Allowance for credit losses on loans and finance leases	$ 288,360	$ 385,887	$ 324,958	$ 384,718	$ 319,297	$ 155,139
Allowance for credit losses, numerator [Member] | Amortized cost, denominator [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses to amortized cost	2.59%	3.28%
Residential mortgage loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 3,095,015	$ 3,521,954
Allowance for credit losses on loans and finance leases	83,226	120,311	112,882	131,781	111,450	44,806
Residential mortgage loans [Member] | Loans held for investmet [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 3,095,015	$ 3,521,954
Residential mortgage loans [Member] | Allowance for credit losses, numerator [Member] | Amortized cost, denominator [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses to amortized cost	2.69%	3.42%
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 2,932,712	$ 3,202,590
Allowance for credit losses on loans and finance leases	33,348	37,944	37,470	42,909	38,310	15,198
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] | Loans held for investmet [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 2,932,712	$ 3,202,590
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] | Allowance for credit losses, numerator [Member] | Amortized cost, denominator [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses to amortized cost	1.14%	1.18%
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 2,136,502	$ 2,230,602
Allowance for credit losses on loans and finance leases	67,406	109,342	72,452	75,726	49,435	39,194
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | Loans held for investmet [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 2,136,502	$ 2,230,602
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | Allowance for credit losses, numerator [Member] | Amortized cost, denominator [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses to amortized cost	3.15%	4.90%
Commercial Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 170,208	$ 212,500
Allowance for credit losses on loans and finance leases	5,319	5,380	4,757	10,241	7,800	2,370
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Loans held for investmet [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 170,208	$ 212,500
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Allowance for credit losses, numerator [Member] | Amortized cost, denominator [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses to amortized cost	3.13%	2.53%
Consumer Portfolio Segment [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 2,806,145	$ 2,609,643
Allowance for credit losses on loans and finance leases	99,061	112,910	$ 97,397	$ 124,061	$ 112,302	$ 53,571
Consumer Portfolio Segment [Member] | Loans held for investmet [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 2,806,145	$ 2,609,643
Consumer Portfolio Segment [Member] | Allowance for credit losses, numerator [Member] | Amortized cost, denominator [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for credit losses to amortized cost	3.53%	4.33%

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