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LOANS AND LEASES RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES ON LOANS AND LEASES- Schedule of Loans and Leases Receivable (Detail) - USD ($) $ in Thousands	Sep. 30, 2025	Jun. 30, 2025	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023
PCD debt securities acquired:
Total consumer loans receivable	$ 14,668,170		$ 13,104,883
Loans and leases receivable	14,673,636		13,127,634
Loans receivable, mortgage finance, at fair value	1,486,978		1,321,128
Loans receivable, installment, at fair value	111,636		0
Allowance for credit losses on loans and leases	(151,809)	$ (147,418)	(136,775)	$ (133,158)	$ (132,436)	$ (135,311)
Total loans and leases receivable, net of allowance for credit losses on loans and leases	16,120,441		14,311,987
Deferred (fees) costs and unamortized (discounts) premiums, net	(35,500)		(20,800)
Multifamily
PCD debt securities acquired:
Total consumer loans receivable	2,356,590		2,252,246
Allowance for credit losses on loans and leases	(19,973)	(20,864)	(18,511)	(18,090)	(20,652)	(16,343)
Construction
PCD debt securities acquired:
Total consumer loans receivable	123,290		147,209
Allowance for credit losses on loans and leases	(1,978)	(2,160)	(1,250)	(1,606)	(1,856)	(1,482)
Residential real estate
PCD debt securities acquired:
Total consumer loans receivable	514,544		496,559
Allowance for credit losses on loans and leases	(6,345)	(6,331)	(5,968)	(5,837)	(5,884)	(6,586)
Manufactured housing
PCD debt securities acquired:
Total consumer loans receivable	28,749		33,123
Allowance for credit losses on loans and leases	(3,508)	$ (3,721)	(3,829)	$ (4,081)	$ (4,094)	$ (4,239)
Commercial
PCD debt securities acquired:
Total consumer loans receivable	13,350,806		11,884,299
Commercial | Specialized lending
PCD debt securities acquired:
Total consumer loans receivable	7,083,620		5,842,420
Commercial | Other commercial and industrial
PCD debt securities acquired:
Total consumer loans receivable	1,146,233		1,182,350
Commercial | Multifamily
PCD debt securities acquired:
Total consumer loans receivable	2,356,590		2,252,246
Commercial | Commercial real estate owner occupied
PCD debt securities acquired:
Total consumer loans receivable	1,058,741		1,100,944
Commercial | Commercial real estate non-owner occupied
PCD debt securities acquired:
Total consumer loans receivable	1,582,332		1,359,130
Commercial | Construction
PCD debt securities acquired:
Total consumer loans receivable	123,290		147,209
Commercial | Direct finance equipment leases
PCD debt securities acquired:
Loans and leases receivable	272,100		262,700
Consumer
PCD debt securities acquired:
Total consumer loans receivable	1,322,830		1,243,335
Consumer | Residential real estate
PCD debt securities acquired:
Total consumer loans receivable	514,544		496,559
Consumer | Manufactured housing
PCD debt securities acquired:
Total consumer loans receivable	28,749		33,123
Consumer | Personal
PCD debt securities acquired:
Total consumer loans receivable	570,768		463,854
Consumer | Other
PCD debt securities acquired:
Total consumer loans receivable	$ 208,769		$ 249,799

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