LOANS AND LEASES RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES ON LOANS AND LEASES - Summary of Amortized Cost of Loans and Leases on Nonaccrual Status (Detail) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Financing Receivable, Impaired [Line Items]
Non-accrual loans with no related allowance	$ 37,774	$ 23,757
Non-accrual loans with related allowance	16,948	17,515
Total non-accrual loans	54,722	41,272
Commercial and industrial, including specialized lending
Financing Receivable, Impaired [Line Items]
Non-accrual loans with no related allowance	11,156	8,108
Non-accrual loans with related allowance	11,672	11,682
Total non-accrual loans	22,828	19,790
Multifamily
Financing Receivable, Impaired [Line Items]
Non-accrual loans with no related allowance	14,205	2,092
Non-accrual loans with related allowance	0	0
Total non-accrual loans	14,205	2,092
Commercial real estate owner occupied
Financing Receivable, Impaired [Line Items]
Non-accrual loans with no related allowance	5,692	3,876
Non-accrual loans with related allowance	0	0
Total non-accrual loans	5,692	3,876
Commercial real estate non-owner occupied
Financing Receivable, Impaired [Line Items]
Non-accrual loans with no related allowance	135	168
Non-accrual loans with related allowance	0	0
Total non-accrual loans	135	168
Residential real estate
Financing Receivable, Impaired [Line Items]
Non-accrual loans with no related allowance	6,586	9,513
Non-accrual loans with related allowance	154	158
Total non-accrual loans	6,740	9,671
Manufactured housing
Financing Receivable, Impaired [Line Items]
Non-accrual loans with no related allowance	0	0
Non-accrual loans with related allowance	1,047	1,192
Total non-accrual loans	1,047	1,192
Installment
Financing Receivable, Impaired [Line Items]
Non-accrual loans with no related allowance	0	0
Non-accrual loans with related allowance	4,075	4,483
Total non-accrual loans	$ 4,075	$ 4,483