Goodwill and Intangibles - Summary of Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified
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Mar. 31, 2015
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Dec. 31, 2014
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Finite-Lived Intangible Assets [Line Items] |
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Gross Intangible Assets |
$ 14,583us-gaap_FiniteLivedIntangibleAssetsGross |
$ 14,560us-gaap_FiniteLivedIntangibleAssetsGross |
Accumulated Amortization |
(6,038)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization |
(5,618)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization |
Net Intangible Assets |
8,545us-gaap_IntangibleAssetsNetExcludingGoodwill |
8,942us-gaap_IntangibleAssetsNetExcludingGoodwill |
Core Deposits [Member] |
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Finite-Lived Intangible Assets [Line Items] |
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Gross Intangible Assets |
7,610us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CoreDepositsMember |
7,610us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CoreDepositsMember |
Accumulated Amortization |
(3,578)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CoreDepositsMember |
(3,321)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CoreDepositsMember |
Net Intangible Assets |
4,032us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CoreDepositsMember |
4,289us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = us-gaap_CoreDepositsMember |
CB&T Intangibles [Member] |
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Finite-Lived Intangible Assets [Line Items] |
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Gross Intangible Assets |
3,142us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = wsfs_ChristianaBankAndTrustIntangiblesMember |
3,142us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = wsfs_ChristianaBankAndTrustIntangiblesMember |
Accumulated Amortization |
(1,035)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = wsfs_ChristianaBankAndTrustIntangiblesMember |
(985)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = wsfs_ChristianaBankAndTrustIntangiblesMember |
Net Intangible Assets |
2,107us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = wsfs_ChristianaBankAndTrustIntangiblesMember |
2,157us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = wsfs_ChristianaBankAndTrustIntangiblesMember |
Array and Arrow Intangibles [Member] |
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Finite-Lived Intangible Assets [Line Items] |
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Gross Intangible Assets |
2,353us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = wsfs_ArrayAndArrowIntangiblesMember |
2,353us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = wsfs_ArrayAndArrowIntangiblesMember |
Accumulated Amortization |
(584)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = wsfs_ArrayAndArrowIntangiblesMember |
(497)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = wsfs_ArrayAndArrowIntangiblesMember |
Net Intangible Assets |
1,769us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = wsfs_ArrayAndArrowIntangiblesMember |
1,856us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = wsfs_ArrayAndArrowIntangiblesMember |
Mortgage Servicing Rights [Member] |
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Finite-Lived Intangible Assets [Line Items] |
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Gross Intangible Assets |
1,478us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = wsfs_MortgageServicingRightsMember |
1,455us-gaap_FiniteLivedIntangibleAssetsGross / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = wsfs_MortgageServicingRightsMember |
Accumulated Amortization |
(841)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = wsfs_MortgageServicingRightsMember |
(815)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = wsfs_MortgageServicingRightsMember |
Net Intangible Assets |
$ 637us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = wsfs_MortgageServicingRightsMember |
$ 640us-gaap_IntangibleAssetsNetExcludingGoodwill / us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis = wsfs_MortgageServicingRightsMember |