XML 40 R18.htm IDEA: XBRL DOCUMENT
v3.8.0.1

FHLB Advances and Other Borrowings | 12 Months Ended
--- | ---
Sep. 30, 2017
Banking and Thrift [Abstract] |
FHLB Advances and Other Borrowings | FHLB ADVANCES AND OTHER BORROWINGS The table below shows the maturity dates of outstanding FHLB advances.
| September 30, 2017 | September 30, 2016
| (In thousands)
FHLB advances |  |
Within 1 year | $ | 1,395,000 |  | $ | 200,000 |
1 to 3 years | 430,000 |  | 880,000 |
3 to 5 years | 400,000 |  | 700,000 |
More than 5 years | — |  | 300,000 |
| $ | 2,225,000 |  | $ | 2,080,000 |
There were no advances included in the above table that are callable by the FHLB. Financial data pertaining to the weighted-average cost and the amount of FHLB advances were as follows.
| 2017 | 2016 | 2015
| (In thousands)
Weighted average interest rate, net of cash flow hedges, at end of year | 2.80 | % | 3.15 | % | 3.35 | %
Weighted daily average interest rate, net of cash flow hedges, during the year | 3.00 | % | 3.22 | % | 3.57 | %
Daily average of FHLB advances during the year | $ | 2,167,986 |  | $ | 1,992,434 |  | $ | 1,848,904 |
Maximum amount of FHLB advances at any month end | $ | 2,350,000 |  | $ | 2,080,000 |  | $ | 1,930,000 |
Interest expense during the year (excludes interest rate swap expense) | $ | 64,968 |  | $ | 64,058 |  | $ | 64,331 |
The Bank has a credit line with the Federal Home Loan Bank of Des Moines ("FHLB") equal to 48% of total assets. The Bank has entered into borrowing agreements with the FHLB to borrow funds under a short-term floating rate cash management advance program and a fixed-rate term loan agreements. All borrowings are secured by stock of the FHLB, deposits with the FHLB and a blanket pledge of qualifying loans receivable as provided in the agreements with the FHLB.

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

X
- Definition Federal Home Loan Bank Advances and Other Borrowings + References No definition available. + Details
Name: | wfsl_FederalHomeLoanBankAdvancesandOtherBorrowingsTextBlock
Namespace Prefix: | wfsl_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration