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LOANS AND LEASES RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES ON LOANS AND LEASES - Performance Status (Detail) - USD ($) $ in Thousands			9 Months Ended
	Sep. 30, 2025	Dec. 31, 2024	Sep. 30, 2025
PCD debt securities acquired:
Total consumer loans receivable	$ 14,668,170	$ 13,104,883	$ 14,668,170
Loans still accruing interest because collection is considered probable	4,000	17,100	4,000
Purchased-credit-impaired loans	121,100	126,400
Total past due
PCD debt securities acquired:
Total consumer loans receivable	47,248	114,729	47,248
30-59 Days past due
PCD debt securities acquired:
Total consumer loans receivable	19,144	33,275	19,144
60-89 Days past due
PCD debt securities acquired:
Total consumer loans receivable	10,000	29,677	10,000
90 Days or more past due
PCD debt securities acquired:
Total consumer loans receivable	18,104	51,777	18,104
Current
PCD debt securities acquired:
Total consumer loans receivable	14,620,922	12,990,154	14,620,922
Commercial and industrial, including specialized lending
PCD debt securities acquired:
Total consumer loans receivable	8,224,387	7,002,019	8,224,387
Par value			32,100
Allowance for credit losses			1,000
Commercial and industrial, including specialized lending | Total past due
PCD debt securities acquired:
Total consumer loans receivable	10,523	27,115	10,523
Commercial and industrial, including specialized lending | 30-59 Days past due
PCD debt securities acquired:
Total consumer loans receivable	6,257	3,655	6,257
Commercial and industrial, including specialized lending | 60-89 Days past due
PCD debt securities acquired:
Total consumer loans receivable	144	19,854	144
Commercial and industrial, including specialized lending | 90 Days or more past due
PCD debt securities acquired:
Total consumer loans receivable	4,122	3,606	4,122
Commercial and industrial, including specialized lending | Current
PCD debt securities acquired:
Total consumer loans receivable	8,213,864	6,974,904	8,213,864
Multifamily
PCD debt securities acquired:
Total consumer loans receivable	2,356,590	2,252,246	2,356,590
Multifamily | Total past due
PCD debt securities acquired:
Total consumer loans receivable	0	11,834	0
Multifamily | 30-59 Days past due
PCD debt securities acquired:
Total consumer loans receivable	0	0	0
Multifamily | 60-89 Days past due
PCD debt securities acquired:
Total consumer loans receivable	0	0	0
Multifamily | 90 Days or more past due
PCD debt securities acquired:
Total consumer loans receivable	0	11,834	0
Multifamily | Current
PCD debt securities acquired:
Total consumer loans receivable	2,356,590	2,240,412	2,356,590
Commercial real estate owner occupied
PCD debt securities acquired:
Total consumer loans receivable	1,058,741	1,100,944	1,058,741
Commercial real estate owner occupied | Total past due
PCD debt securities acquired:
Total consumer loans receivable	3,931	19,466	3,931
Commercial real estate owner occupied | 30-59 Days past due
PCD debt securities acquired:
Total consumer loans receivable	0	11,395	0
Commercial real estate owner occupied | 60-89 Days past due
PCD debt securities acquired:
Total consumer loans receivable	0	0	0
Commercial real estate owner occupied | 90 Days or more past due
PCD debt securities acquired:
Total consumer loans receivable	3,931	8,071	3,931
Commercial real estate owner occupied | Current
PCD debt securities acquired:
Total consumer loans receivable	1,054,810	1,081,478	1,054,810
Commercial real estate non-owner occupied
PCD debt securities acquired:
Total consumer loans receivable	1,582,332	1,359,130	1,582,332
Commercial real estate non-owner occupied | Total past due
PCD debt securities acquired:
Total consumer loans receivable	3,747	17,007	3,747
Commercial real estate non-owner occupied | 30-59 Days past due
PCD debt securities acquired:
Total consumer loans receivable	0	0	0
Commercial real estate non-owner occupied | 60-89 Days past due
PCD debt securities acquired:
Total consumer loans receivable	3,747	0	3,747
Commercial real estate non-owner occupied | 90 Days or more past due
PCD debt securities acquired:
Total consumer loans receivable	0	17,007	0
Commercial real estate non-owner occupied | Current
PCD debt securities acquired:
Total consumer loans receivable	1,578,585	1,342,123	1,578,585
Construction
PCD debt securities acquired:
Total consumer loans receivable	123,290	147,209	123,290
Construction | Total past due
PCD debt securities acquired:
Total consumer loans receivable	0	0	0
Construction | 30-59 Days past due
PCD debt securities acquired:
Total consumer loans receivable	0	0	0
Construction | 60-89 Days past due
PCD debt securities acquired:
Total consumer loans receivable	0	0	0
Construction | 90 Days or more past due
PCD debt securities acquired:
Total consumer loans receivable	0	0	0
Construction | Current
PCD debt securities acquired:
Total consumer loans receivable	123,290	147,209	123,290
Residential real estate
PCD debt securities acquired:
Total consumer loans receivable	514,544	496,559	514,544
Residential real estate | Total past due
PCD debt securities acquired:
Total consumer loans receivable	12,331	17,485	12,331
Residential real estate | 30-59 Days past due
PCD debt securities acquired:
Total consumer loans receivable	5,296	9,541	5,296
Residential real estate | 60-89 Days past due
PCD debt securities acquired:
Total consumer loans receivable	2,767	4,560	2,767
Residential real estate | 90 Days or more past due
PCD debt securities acquired:
Total consumer loans receivable	4,268	3,384	4,268
Residential real estate | Current
PCD debt securities acquired:
Total consumer loans receivable	502,213	479,074	502,213
Manufactured housing
PCD debt securities acquired:
Total consumer loans receivable	28,749	33,123	28,749
Manufactured housing | Total past due
PCD debt securities acquired:
Total consumer loans receivable	2,133	3,183	2,133
Manufactured housing | 30-59 Days past due
PCD debt securities acquired:
Total consumer loans receivable	509	766	509
Manufactured housing | 60-89 Days past due
PCD debt securities acquired:
Total consumer loans receivable	66	155	66
Manufactured housing | 90 Days or more past due
PCD debt securities acquired:
Total consumer loans receivable	1,558	2,262	1,558
Manufactured housing | Current
PCD debt securities acquired:
Total consumer loans receivable	26,616	29,940	26,616
Installment
PCD debt securities acquired:
Total consumer loans receivable	779,537	713,653	779,537
Installment | Total past due
PCD debt securities acquired:
Total consumer loans receivable	14,583	18,639	14,583
Installment | 30-59 Days past due
PCD debt securities acquired:
Total consumer loans receivable	7,082	7,918	7,082
Installment | 60-89 Days past due
PCD debt securities acquired:
Total consumer loans receivable	3,276	5,108	3,276
Installment | 90 Days or more past due
PCD debt securities acquired:
Total consumer loans receivable	4,225	5,613	4,225
Installment | Current
PCD debt securities acquired:
Total consumer loans receivable	$ 764,954	$ 695,014	$ 764,954

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