XML 82 R40.htm IDEA: XBRL DOCUMENT
v3.20.2

FHLB Advances and Other Borrowings (Tables) | 12 Months Ended
--- | ---
Sep. 30, 2020
Federal Home Loan Banks [Abstract] |
Maturity dates of outstanding FHLB advances | The table below shows the contractual maturity dates of outstanding FHLB advances.
| September 30, 2020 | September 30, 2019
| (In thousands)
FHLB advances |  |
Within 1 year | $ | 1,830,000 |  | $ | 950,000 |
1 to 3 years | 520,000 |  | 750,000 |
3 to 5 years | 350,000 |  | 400,000 |
More than 5 years | — |  | 150,000 |
| $ | 2,700,000 |  | $ | 2,250,000 |
Weighted average cost and amount of advances | Financial information pertaining to the weighted-average cost and the amount of FHLB advances were as follows.
| 2020 | 2019 | 2018
| ($ in thousands)
Weighted average interest rate, including cash flow hedges, at end of year | 1.79 | % | 2.49 | % | 2.66 | %
Weighted daily average interest rate, including cash flow hedges, during the year | 2.03 | % | 2.69 | % | 2.62 | %
Daily average of FHLB advances during the year | $ | 2,532,596 |  | $ | 2,533,890 |  | $ | 2,384,795 |
Maximum amount of FHLB advances at any month end | $ | 3,050,000 |  | $ | 2,665,000 |  | $ | 2,620,000 |
Interest expense during the year (including swap interest income and expense) | $ | 51,445 |  | $ | 68,190 |  | $ | 62,452 |

X
- Definition Tabular disclosure of advances made and reported by Federal Home Loan Bank (FHLBank). + References No definition available. + Details
Name: | us-gaap_FederalHomeLoanBankAdvancesTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_FederalHomeLoanBanksAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Weighted Average Cost and Amount of Advances [Table Text Block] + References No definition available. + Details
Name: | wfsl_WeightedAverageCostAndAmountOfAdvancesTableTextBlock
Namespace Prefix: | wfsl_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration