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BUSINESS COMBINATION (Tables) | 12 Months Ended
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Sep. 30, 2025
Business Combination, Asset Acquisition, Transaction between Entities under Common Control, and Joint Venture Formation [Abstract] |
Schedule of Business Acquisition | The purchase price for purposes of the transaction accounting adjustments is calculated based on the number of shares of WaFd stock issued to LBC shareholders and the closing share price on the Merger Date as shown in the following table (amounts in thousands except share and per share data).
Number of WaFd shares issued to LBC shareholders |  | 17,089
WaFd market price per share on February 29, 2024 |  | $27.24
Purchase price of shares issued to LBC shareholders |  | $465,501
Cash in lieu of fractional shares |  | $3
Purchase price consideration |  | $465,504
The following table shows the impact of merger-related expenses for the years ended September 30, 2025 and September 30, 2024.
| Year Ended
Merger-Related Expenses | September 30, 2025 |  | September 30, 2024
| (in thousands)
Severance and employee-related | $— |  | $18,846
Legal and Professional | 103 |  | 5,573
Charitable contributions | — |  | 1,000
System conversion and integration | 136 |  | 900
| $239 |  | $26,319
Schedule of Assets Acquired and Liabilities Assumed |
| March 1, 2024
| (in thousands)
Total merger consideration |  | $465,504
Fair value of assets acquired |  |
Cash and cash equivalents | $627,403 |
Investment securities | 518,878 |
Loans receivable | 3,186,891 |
Loans held for sale | 3,017,506 |
Interest receivable | 25,697 |
Premises and equipment | 6,436 |
FHLB stock | 35,831 |
Bank owned life insurance | 17,781 |
Intangible assets | 37,022 |
Deferred tax asset, net | 125,151 |
Other assets | 75,398 |
Total assets acquired | $7,673,994 |
Fair value of liabilities assumed |  |
Customer accounts | $5,640,440 |
Borrowings | 1,432,138 |
Junior subordinated deferrable interest debentures | 50,175 |
Senior Debt | 93,514 |
Accrued expenses and other liabilities | 100,113 |
Total liabilities assumed | $7,316,380 |
Net Assets Acquired |  | $357,614
Goodwill |  | $107,890
Schedule of Financing Receivables Acquired | The following table provides a summary of these PCD loans at acquisition:
| March 1, 2024
| (In thousands)
Principal of PCD loans acquired | $293,204
PCD ACL at acquisition | (7,403)
Non-credit discount on PCD loans | (45,869)
Fair value of PCD loans | $239,932
Schedule of Pro Forma Information | The following table presents unaudited pro forma information as if the Merger had occurred on October 1, 2022. The pro forma adjustments give effect to any change in interest income due to the accretion of the discount (premium) associated with the fair value adjustments to acquired loans, any change in interest expense due to estimated premium amortization/discount accretion associated with the fair value adjustment to acquired interest-bearing deposits, borrowings and long-term debt and the amortization of the core deposit intangible that would have resulted had the deposits been acquired as of October 1, 2022. The pro forma information is not indicative of what would have occurred had the Merger occurred as of the beginning of the year prior to the Merger Date. The pro forma amounts below do not reflect the Company's expectations as of the date of the pro forma information of further operating cost savings and other business synergies expected to be achieved, including revenue growth as a result of the Merger. As a result, actual amounts differed from the unaudited pro forma information presented.
| Unaudited Pro Forma for the Year Ended
| September 30, 2024 |  | September 30, 2023
| (in thousands)
Net-interest income | $710,644 |  | $833,957
Non-interest income | 63,371 |  | 56,331
Net income | 207,689 |  | 291,832

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