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ALLOWANCE FOR CREDIT LOSSES FOR LOANS AND FINANCE LEASES - Activity in ACL on loans and finance leases (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Jan. 01, 2020
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning balance	$ 324,958	$ 319,297	$ 385,887	$ 155,139
Allowance established for acquired PCD loans		28,744		28,744
Loans and finance leases	(8,734)	48,078	(49,479)	158,531
Charge-offs	(34,366)	(14,355)	(68,466)	(46,599)
Recoveries	6,502	2,954	20,418	7,738
Ending balance	288,360	384,718	288,360	384,718
ASC 326 | Cumulative Effect Period Of Adoption Adjustment [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Impact of adopting ASC 326 on Loans and Finance leases					$ 81,165
Residential Portfolio Segment [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning balance	112,882	111,450	120,311	44,806
Allowance established for acquired PCD loans		12,739		12,739
Loans and finance leases	(6,206)	9,875	(9,556)	32,255
Charge-offs	(25,418)	(2,611)	(31,170)	(8,968)
Recoveries	1,968	328	3,641	1,112
Ending balance	83,226	131,781	83,226	131,781
Residential Portfolio Segment [Member] | ASC 326 | Cumulative Effect Period Of Adoption Adjustment [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Impact of adopting ASC 326 on Loans and Finance leases					49,837
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning balance	37,470	38,310	37,944	15,198
Allowance established for acquired PCD loans		1,830		1,830
Loans and finance leases	(4,449)	2,839	(10,187)	11,225
Charge-offs	(167)	(150)	(1,036)	(323)
Recoveries	494	80	6,627	248
Ending balance	33,348	42,909	33,348	42,909
Commercial Portfolio Segment [Member] | Commercial And Industrial Sector [Member] | ASC 326 | Cumulative Effect Period Of Adoption Adjustment [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Impact of adopting ASC 326 on Loans and Finance leases					14,731
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning balance	72,452	49,435	109,342	39,194
Allowance established for acquired PCD loans		9,723		9,723
Loans and finance leases	(4,660)	19,672	(40,779)	49,278
Charge-offs	(429)	(3,157)	(1,304)	(3,303)
Recoveries	43	53	147	140
Ending balance	67,406	75,726	67,406	75,726
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | ASC 326 | Cumulative Effect Period Of Adoption Adjustment [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Impact of adopting ASC 326 on Loans and Finance leases					(19,306)
Commercial Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning balance	4,757	7,800	5,380	2,370
Allowance established for acquired PCD loans		0		0
Loans and finance leases	527	2,405	(125)	7,068
Charge-offs	(7)	(1)	(52)	(75)
Recoveries	42	37	116	81
Ending balance	5,319	10,241	5,319	10,241
Commercial Portfolio Segment [Member] | Construction Loans [Member] | ASC 326 | Cumulative Effect Period Of Adoption Adjustment [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Impact of adopting ASC 326 on Loans and Finance leases					797
Consumer Portfolio Segment [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Beginning balance	97,397	112,302	112,910	53,571
Allowance established for acquired PCD loans		4,452		4,452
Loans and finance leases	6,054	13,287	11,168	58,705
Charge-offs	(8,345)	(8,436)	(34,904)	(33,930)
Recoveries	3,955	2,456	9,887	6,157
Ending balance	$ 99,061	$ 124,061	$ 99,061	$ 124,061
Consumer Portfolio Segment [Member] | ASC 326 | Cumulative Effect Period Of Adoption Adjustment [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Impact of adopting ASC 326 on Loans and Finance leases					$ 35,106

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