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Covered Assets - FDIC Indemnification Asset (Details) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended 12 Months Ended
Mar. 31, 2015
Sep. 30, 2014
FDIC Indemnification Asset Movement Analysis [Roll Forward]    
Balance at beginning of period $ 36,860wfsl_FdicLossShareReceivable $ 64,615wfsl_FdicLossShareReceivable
Additions and deletions (1) (1,795)wfsl_AdditionsToFdicIndemnificationAsset 1,795wfsl_AdditionsToFdicIndemnificationAsset
Payments made (received) 738wfsl_FdicIndemnificationAssetPayments (2,502)wfsl_FdicIndemnificationAssetPayments
Amortization (12,972)wfsl_FdicIndemnificationAssetAmortization (27,850)wfsl_FdicIndemnificationAssetAmortization
Accretion 284wfsl_FdicIndemnificationAssetDiscountAccretion 802wfsl_FdicIndemnificationAssetDiscountAccretion
Balance at end of period $ 23,115wfsl_FdicLossShareReceivable $ 36,860wfsl_FdicLossShareReceivable