WSFS Financial (WSFS) 10-Q 11 May 15 2015 Q1 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	3 Months Ended
	Mar. 31, 2015	1-May-15
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	FALSE
Document Period End Date	31-Mar-15
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	Q1
Trading Symbol	WSFS
Entity Registrant Name	WSFS FINANCIAL CORP
Entity Central Index Key	828944
Current Fiscal Year End Date	-19
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		9,421,991

Consolidated_Statements_of_Ope

Consolidated Statements of Operations (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Interest income:
Interest and fees on loans	$36,244	$32,202
Interest on mortgage-backed securities	3,433	3,278
Interest and dividends on investment securities	860	792
Interest on reverse mortgage loans	1,236	1,197
Other interest income	1,078	316
Total interest income	42,851	37,785
Interest expense:
Interest on deposits	1,942	1,656
Interest on Federal Home Loan Bank advances	713	526
Interest on federal funds purchased and securities sold under agreements to repurchase	80	251
Interest on trust preferred borrowings	327	326
Interest on senior debt	942	942
Interest on bonds payable		15
Interest on other borrowings	30	25
Total interest expense	4,034	3,741
Net interest income	38,817	34,044
Provision for loan losses	786	2,630
Net interest income after provision for loan losses	38,031	31,414
Noninterest income:
Credit/debit card and ATM income	6,027	5,766
Deposit service charges	3,905	4,269
Wealth management income	5,093	3,834
Mortgage banking activities, net	1,703	812
Loan fee income	463	384
Bank owned life insurance income	203	139
Security gains, net	451	578
Other income	3,250	2,582
Total non interest income	21,095	18,364
Noninterest expense:
Salaries, benefits and other compensation	21,010	18,474
Occupancy expense	3,878	3,729
Equipment expense	2,082	1,687
Data processing and operations expenses	1,422	1,471
Professional fees	1,472	1,106
FDIC expenses	669	653
Loan workout and OREO expenses	-1	539
Marketing expense	584	499
Corporate development costs	596	254
Other operating expense	7,201	5,472
Total non interest expenses	38,913	33,884
Income before taxes	20,213	15,894
Income tax provision	7,324	-1,017
Net income	$12,889	$16,911
Earnings per share:
Basic	$1.37	$1.90
Diluted	$1.34	$1.85

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Statement of Comprehensive Income [Abstract]
Net Income	$12,889	$16,911
Net change in unrealized gains (losses) on investment securities available-for-sale
Net unrealized gains (losses) arising during the period, net of tax expense (benefit) of $2,794 and $5,604, respectively	4,567	9,145
Less: reclassification adjustment for net gains on sales realized in net income, net of tax expense of $171 and $220, respectively	-280	-358
Amortization of unrealized gain on securities reclassified to held-to-maturity	-171
Net change in unrealized gains (losses) on investment securities available-for-sale	4,116	8,787
Net change in unfunded pension liability
Change in unfunded pension liability related to unrealized gain, prior service cost and transition obligation, net of tax expense of $9	-15
Total other comprehensive income	4,101	8,787
Total comprehensive income	$16,990	$25,698

Consolidated_Statements_of_Com1

Consolidated Statements of Comprehensive Income (Parenthetical) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Statement of Comprehensive Income [Abstract]
Net change in Unrealized gains (losses), tax expense (benefit)	$2,794	$5,604
Reclassification adjustment for gains, tax expense	171	220
Change in unfunded pension liability related to unrealized gain, prior service cost and transition obligation, tax expense	$9

Consolidated_Statements_of_Con

Consolidated Statements of Condition (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Assets
Cash and due from banks	$92,481	$93,717
Cash in non-owned ATMs	412,958	414,188
Interest-bearing deposits in other banks	199	134
Total cash and cash equivalents	505,638	508,039
Investment securities, available-for-sale	786,497	740,124
Investment securities, held-to-maturity	122,887	126,168
Loans held-for-sale at fair value	46,892	28,508
Loans, net of allowance for loan losses of $39,507 at March 31, 2015 and $39,426 at December 31, 2014	3,189,138	3,156,652
Reverse mortgage loans	27,035	29,298
Bank-owned life insurance	76,712	76,509
Stock in Federal Home Loan Bank of Pittsburgh, at cost	27,655	23,278
Assets acquired through foreclosure	6,088	5,734
Accrued interest receivable	12,004	11,782
Premises and equipment	34,300	35,074
Goodwill	48,824	48,651
Intangible assets	8,545	8,942
Other assets	54,265	54,561
Total assets	4,946,480	4,853,320
Deposits:
Noninterest-bearing demand	837,416	804,678
Interest-bearing demand	699,312	688,370
Money market	899,917	1,066,224
Savings	418,004	402,032
Time	243,305	253,302
Jumbo certificates of deposit - customer	230,698	247,671
Total customer deposits	3,328,652	3,462,277
Brokered deposits	193,626	186,958
Total deposits	3,522,278	3,649,235
Federal funds purchased and securities sold under agreements to repurchase	113,850	128,225
Federal Home Loan Bank advances	623,759	405,894
Trust preferred borrowings	67,011	67,011
Senior debt	55,000	55,000
Other borrowed funds	14,937	11,645
Accrued interest payable	1,621	1,004
Other liabilities	42,529	46,255
Total liabilities	4,440,985	4,364,269
Stockholders' Equity:
Common stock $0.01 par value, 20,000,000 shares authorized; issued 18,596,981 at March 31, 2015 and 18,565,708 at December 31, 2014	186	186
Capital in excess of par value	203,238	201,501
Accumulated other comprehensive income	7,601	3,500
Retained earnings	534,584	523,099
Treasury stock at cost, 9,174,735 shares at March 31, 2015 and 9,163,096 shares at December 31, 2014	-240,114	-239,235
Total stockholders' equity	505,495	489,051
Total liabilities and stockholders' equity	$4,946,480	$4,853,320

Consolidated_Statements_of_Con1

Consolidated Statements of Condition (Parenthetical) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, except Share data, unless otherwise specified
Statement of Financial Position [Abstract]
Allowance for loan losses	$39,507	$39,426
Common stock, par value	$0.01	$0.01
Common stock, shares authorized	20,000,000	20,000,000
Common stock, issued	18,596,981	18,565,708
Treasury stock, shares	9,174,735	9,163,096

Consolidated_Statement_of_Cash

Consolidated Statement of Cash Flows (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Operating activities:
Net Income	$12,889	$16,911
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan losses	786	2,630
Depreciation of premises and equipment	1,519	1,516
Amortization of fees and discounts, net	3,068	2,194
Amortization of intangible assets, net	466	345
(Increase) decrease in accrued interest receivable	-222	83
Increase in other assets	-4,275	-634
Origination of loans held-for-sale	-83,411	-42,631
Proceeds from sales of loans held-for-sale	66,225	55,883
Gain on mortgage banking activities, net	-1,703	-812
Gain on sale of securities, net	-451	-578
Stock-based compensation expense	1,364	715
Excess tax benefit from stock-based compensation	-522	-164
Increase in accrued interest payable	617	732
Decrease in other liabilities	-3,834	-3,155
Loss on sale of assets acquired through foreclosure and valuation adjustments, net	75	11
Deferred income tax expense (benefit)	2,389	-5,324
Increase in value of bank-owned life insurance	-203	-139
Increase in capitalized interest, net	-1,236	-1,417
Net cash (used for) provided by operating activities	-6,756	26,166
Investing activities:
Maturities and calls of investment securities	1,761	2,230
Sale of investment securities available-for-sale	35,553	38,621
Purchases of investment securities available-for-sale	-94,300	-82,222
Repayments of investment securities available-for-sale	19,399	12,269
Repayments on reverse mortgages	3,743	2,760
Disbursements for reverse mortgages	-244	-281
Net increase in loans	-36,108	-54,047
Net (increase) decrease in stock of FHLB	-4,377	2,291
Sales of assets acquired through foreclosure, net	1,184	1,864
Investment in premises and equipment, net	-817	-537
Net cash used for investing activities	-74,206	-77,052
Financing activities:
Net decrease in demand and saving deposits	-103,384	-88,447
Decrease in time deposits	-26,970	-6,957
Increase in brokered deposits	6,668	78,642
Increase in loan payable	21	21
Repayment of reverse mortgage trust bonds payable		-21,990
Receipts from FHLB advances	14,439,318	26,939,076
Repayments of FHLB advances	-14,221,453	-26,922,343
Receipts from federal funds purchased and securities sold under agreement to repurchase	6,981,250	5,798,325
Repayments of federal funds purchased and securities sold under agreement to repurchase	-6,995,625	-5,769,700
Dividends paid	-1,405	-1,067
Issuance of common stock and exercise of common stock options	498	461
Buy back of common stock	-879
Excess tax benefit from stock-based compensation	522	164
Net cash (used for) provided by financing activities	78,561	6,185
Decrease in cash and cash equivalents	-2,401	-44,701
Cash and cash equivalents at beginning of period	508,039	484,426
Cash and cash equivalents at end of period	505,638	439,725
Supplemental Disclosure of Cash Flow Information:
Cash paid for interest during the period	3,417	2,995
Cash paid for income taxes, net	8,566	5,184
Loans transferred to assets acquired through foreclosure	1,613	1,027
Loans transferred to portfolio from held-for-sale at fair value	211	2,169
Net change in accumulated other comprehensive income	4,101	8,787
Non-cash goodwill adjustments, net	$173	$135

Basis_of_Presentation

Basis of Presentation	3 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
Basis of Presentation	1. BASIS OF PRESENTATION
	Our unaudited Consolidated Financial Statements include the accounts of WSFS Financial Corporation (the Company, our Company, we, our or us), Wilmington Savings Fund Society, FSB (WSFS Bank or the Bank) and Cypress Capital Management, LLC (Cypress). We also have one unconsolidated affiliate, WSFS Capital Trust III (the Trust). WSFS Bank has three wholly-owned subsidiaries, WSFS Wealth Investments, 1832 Holdings, Inc. and Monarch Entity Services LLC (Monarch).
	Founded in 1832, the Bank is the seventh oldest bank continuously operating under the same name in the United States. We provide residential and commercial real estate, commercial and consumer lending services, as well as retail deposit and cash management services. Lending activities are funded primarily with customer deposits and borrowings. In addition, we offer a variety of wealth management and trust services to personal and corporate customers through our Wealth Management division. The Federal Deposit Insurance Corporation (FDIC) insures our customers’ deposits to their legal maximums. We serve our customers primarily from our 56 offices located in Delaware (45), Pennsylvania (9), Virginia (1) and Nevada (1) and through our website at www.wsfsbank.com. Information on our website is not incorporated by reference into this quarterly report.
	Amounts subject to significant estimates are items such as the allowance for loan losses and reserves for lending related commitments, goodwill, intangible assets, post-retirement benefit obligations, the fair value of financial instruments, reverse mortgage related assets, income taxes and other-than-temporary impairments (OTTI). Among other effects, changes to such estimates could result in future impairments of investment securities, goodwill and intangible assets and establishment of allowances for loan losses and lending related commitments as well as increased post-retirement benefits expense.
	Our accounting and reporting policies conform to U.S. generally accepted accounting principles (GAAP), prevailing practices within the banking industry for interim financial information and Rule 10-01 of SEC Regulation S-X (Rule 10-01). Rule 10-01 does not require us to include all information and notes that would be required in audited financial statements. Operating results for the periods presented are not necessarily indicative of the results that may be expected for any future quarters or for the year ending December 31, 2015. These unaudited, interim Consolidated Financial Statements should be read in conjunction with the audited Consolidated Financial Statements and related notes included in our 2014 Annual Report on Form 10-K that was filed with the U.S. Securities and Exchange Commission (SEC) on March 16, 2015 and is available at www.sec.gov.
	Whenever necessary, reclassifications have been made to the prior period Consolidated Financial Statements to conform to the current period’s presentation. All significant intercompany transactions were eliminated in consolidation.
	The significant accounting policies used in preparation of our Consolidated Financial Statements are disclosed in our 2014 Annual Report on Form 10-K. There have not been any material changes in our significant accounting policies from those contained in our 2014 Annual Report on Form 10-K.
	Accounting for Stock-Based Compensation
	Stock-based compensation is accounted for in accordance with FASB ASC 718, Stock Compensation. After stockholder approval in 2005, the 1997 Stock Option Plan (1997 Plan) was replaced by the 2005 Incentive Plan (2005 Plan). Upon stockholder approval in 2013, the 2005 Incentive Plan was amended and replaced by the 2013 Incentive Plan (2013 Plan). No future awards may be granted under the 2005 Plan; however, we still have options outstanding the 2005 Plan for officers, directors and employees of us and our subsidiaries (Associates). The 2013 Plan will terminate on the tenth anniversary of its effective date, after which no further awards may be granted under such plan. Collectively, the 1997 Plan, 2005 Plan and 2013 Plan are referred to as Stock Incentive Plans. The number of shares reserved for issuance under the 2013 Plan is 698,845. At March 31, 2015, there were 298,439 shares available for future grants under the 2013 Plan.
	With the exception of certain performance stock awards, the Stock Incentive Plans provide for the granting of incentive stock options as defined in Section 422 of the Internal Revenue Code as well as non-incentive stock options (collectively, stock options). Additionally, the 2013 Plan provides for the granting of stock appreciation rights, performance awards, restricted stock and restricted stock unit awards, deferred stock units, dividend equivalents, other stock-based awards and cash awards. All stock options are to be granted at not less than the market price of our common stock on the date of the grant. With the exception of certain non-plan stock options, all stock options granted during 2015, 2014 and 2013 vest in 25% per annum increments, start to become exercisable one year from the grant date and expire between five and seven years from the grant date. Generally, all awards become exercisable immediately in the event of a change in control, as defined within the Stock Incentive Plans. In addition, the Black-Scholes option-pricing model is used to determine the grant date fair value of stock options.
	Stock Options
	The following table provides information about our stock options outstanding for the three months ended March 31, 2015 and 2014:
		March 31, 2015					March 31, 2014
					Weighted-					Weighted-
					Average					Average
		Shares			Exercise		Shares			Exercise
					Price					Price
	Stock Options:
	Outstanding at beginning of period		661,345		$	49.15		712,578		$	47.42
	Granted		24,576			78.71		43,686			71.47
	Exercised		(25,239	)		45.55		(20,366	)		33.8
	Outstanding at end of period		660,682			50.39		735,898			49.23
	Exercisable at end of period		276,412		$	48.18		137,005		$	47.08
	Weighted-average fair value of awards granted	$	17.2				$	17.35
	The following table provides vesting information about our stock options outstanding for the three months ended March 31, 2015 and 2014:
		March 31, 2015					March 31, 2014
					Weighted-					Weighted-
					Average					Average
		Shares			Exercise		Shares			Exercise
					Price					Price
	Stock Options:
	Unvested at beginning of period		576,381		$	50.01		609,029		$	47.66
	Granted		24,576			78.71		43,686			71.47
	Vested		(216,687	)		49.79		(53,822	)		44.11
	Unvested at end of period		384,270		$	51.97		598,893		$	49.72
	The total amount of compensation cost to be recognized relating to non-vested stock options as of March 31, 2015 was $4.8 million. The weighted-average period over which it is expected to be recognized is 2.8 years. We issue new shares upon the exercise of options.
	Restricted Stock
	We issued 12,714 restricted stock units during the first quarter of 2015. These awards vest over a four year period. The total amount of compensation cost to be recognized relating to non-vested restricted stock as of March 31, 2015, was $1.8 million. The weighted-average period over which it is expected to be recognized is 3.1 years.
	Performance Stock Awards
	The Long-Term Performance-Based Stock Unit program (Long-Term Program) provided for awards up to an aggregate of 77,800 shares of our stock to the remaining 14 participants, only after the achievement of targeted levels of return on assets (ROA) in any year through 2014. During 2014, the company achieved the 1.00% ROA performance level and in accordance with the Long-Term Program, we issued 36,152 restricted stock units to the plan’s participants. The awarded restricted stock units will vest in 25% increments over four years. During the first quarter of 2015, we recognized $102,000 of compensation expense related to this program. Compensation expense related to the Long-Term Program was based on the closing stock price as of May 28, 2008.
	The Board approved a plan in which Marvin N. Schoenhals, Chairman of the Board, was granted 22,250 shares of restricted stock effective January 3, 2011, with a five-year performance vesting schedule starting at the end of the second year. These awards are based on acquiring new business relationships that Mr. Schoenhals played a meaningful role in helping us establish. These shares are subject to vesting in whole or in part based on the role Mr. Schoenhals played in establishing new business relationships that, over a two year period of time, achieve at least a 50% return on the investment of restricted stock cost. We recognized compensation expense of $64,000 related to this award during the first quarter of 2015 compared to $69,000 during the first quarter of 2014. During the first quarter of 2015, 5,563 shares of restricted stock vested based on Mr. Schoenhals performance during 2014.
	For the three months ended March 31, 2015, the effect of stock-based compensation, including stock options, restricted stock, and performance stock, on salaries, benefits and other compensation was $842,000 pre-tax ($593,000 after tax), or $0.06 per share. This compares to $802,000 pre-tax ($577,000 after tax), or $0.06 per share during the three months ended March 31, 2014.
	RECENT ACCOUNTING PRONOUNCEMENTS
	Accounting Standards Updates adopted in 2015
	In June 2014, the FASB issued ASU No. 2014-11, “Repurchase-to-Maturity Transactions, Repurchase Financings, and Disclosures.” The new guidance aligns the accounting for repurchase-to-maturity transactions and repurchase agreements executed as repurchase financings with the accounting for other typical repurchase agreements. Going forward, these transactions would all be accounted for as secured borrowings. The guidance eliminates sale accounting for repurchase-to-maturity transactions and supersedes the guidance under which a transfer of a financial asset and a contemporaneous repurchase financing could be accounted for on a combined basis as a forward agreement, which has resulted in outcomes referred to as off-balance-sheet accounting. The amendments in the ASU require a new disclosure for transactions economically similar to repurchase agreements in which the transferor retains substantially all of the exposure to the economic return on the transferred financial assets throughout the term of the transaction. The amendments in the ASU also require expanded disclosures about the nature of collateral pledged in repurchase agreements and similar transactions accounted for as secured borrowings. The amendments in this ASU are effective for public companies for the first interim or annual period beginning after December 15, 2014. In addition, for public companies, the disclosure for certain transactions accounted for as a sale is effective for the first interim or annual reporting periods beginning on or after December 15, 2014, and the disclosure for transactions accounted for as secured borrowings is required to be presented for annual reporting periods beginning after December 15, 2014, and interim periods beginning after March 15, 2015. The adoption of this accounting guidance does not have a material effect on the Company’s financial condition or results of operations.
	In January 2014, the Financial Accounting Standards Board (FASB), issued Accounting Standards Update (ASU) No. 2014-01, Investments - Equity Method and Joint Ventures (Topic 323) - Accounting for Investments in Qualified Affordable Housing Projects (a consensus of the FASB Emerging Issues Task Force). This ASU permits an entity to make an accounting policy election to account for its investment in qualified affordable housing projects using the proportional amortization method if certain conditions are met. Under the proportionate amortization method, an entity amortizes the initial cost of the investment in proportion to the tax credits and other tax benefits received and recognizes the net investment performance in the income statement as a component of income tax expense (benefit). A reporting entity that uses the effective yield or other method to account for its investments in qualified affordable housing projects before the date of adoption may continue to apply such method to those preexisting investments. We adopted this accounting guidance effective January 1, 2015. The adoption does not have a material effect on the Company’s financial condition or results of operations. For additional discussion on the adoption of this guidance refer to the Income Taxes section of Management’s Discussion and Analysis of Financial Condition and Results of Operations.
	In January 2014, the FASB issued ASU No. 2014-04, Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure (ASU 2014-04). The objective of this guidance is to clarify when an in substance repossession or foreclosure occurs, that is, when a creditor should be considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan such that the loan receivable should be derecognized and the real estate property recognized. ASU No. 2014-04 states that an in substance repossession or foreclosure occurs, and a creditor is considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan, upon either (1) the creditor obtaining legal title to the residential real estate property upon completion of a foreclosure or (2) the borrower conveying all interest in the residential real estate property to the creditor to satisfy that loan through completion of a deed in lieu of foreclosure or through a similar legal agreement. Additionally, ASU No. 2014-04 requires interim and annual disclosure of both (1) the amount of foreclosed residential real estate property held by the creditor and (2) the recorded investment in consumer mortgage loans collateralized by residential real estate property that are in the process of foreclosure according to local requirements of the applicable jurisdiction. The adoption of this accounting guidance does not have a material effect on the Company’s financial condition or results of operations.
	In August 2014, the FASB issued ASU No. 2014-14, Receivables-Troubled Debt Restructurings by Creditors (Subtopic 310-40): Classification of Certain Government-Guaranteed Mortgage Loans upon Foreclosure (a consensus of the FASB Emerging Issues Task Force). The objective of this guidance is to reduce diversity in practice related to how creditors classify government-guaranteed mortgage loans, including FHA or VA guaranteed loans, upon foreclosure. Some creditors reclassify those loans to real estate consistent with other foreclosed loans that do not have guarantees; others reclassify the loans to other receivables. The amendments in this guidance require that a mortgage loan be derecognized and that a separate other receivable be recognized upon foreclosure if the following conditions are met: (1) the loan has a government guarantee that is not separable from the loan before foreclosure; (2) at the time of foreclosure, the creditor has the intent to convey the real estate property to the guarantor and make a claim on the guarantee, and the creditor has the ability to recover under that claim; and (3) at the time of foreclosure, any amount of the claim that is determined on the basis of the fair value of the real estate is fixed. Upon foreclosure, the separate other receivable should be measured based on the amount of the loan balance (principal and interest) expected to be recovered from the guarantor. The adoption of this accounting guidance does not have a material effect on the Company’s financial condition or results of operations.
	Accounting Standards Updates Not Yet Adopted
	In May 2014, the FASB issued ASU No. 2014-9, Revenue from Contracts with Customers (Topic 606). This ASU supersedes the revenue recognition requirements in Accounting Standards Codification (ASC) 605, Revenue Recognition. ASU No. 2014-9 will require an entity to recognize revenue when it transfers promised goods or services to customers using a five-step model that requires entities to exercise judgment when considering the terms of the contracts. This ASU is effective for us beginning April 1, 2017 and can be adopted either retrospectively to each prior reporting period presented or as a cumulative-effect adjustment as of the date of adoption. The Company does not expect the application of this guidance to have a material impact on the Company’s financial statements.
	In February 2015, the FASB issued ASU No 2015-02, Consolidation (Topic 810): Amendments to the Consolidation Analysis. This guidance provides an additional requirement for a limited partnership or similar entity to qualify as a voting interest entity and also amends the criteria for consolidating such an entity. In addition, it amends the criteria for evaluating fees paid to a decision maker or service provider as a variable interest and amends the criteria for evaluating the effect of fee arrangements and related parties on a VIE primary beneficiary determination. This guidance is effective for interim and annual reporting periods beginning after December 15, 2015
	In April 2015, the FASB issued ASU No 2015-03, Interest- Imputation of Interest (Subtopic 835-30) Simplifying the Presentation of Debt Issuance Costs. The amendments in this update require that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. The recognition and measurement guidance for debt issuance costs are not affected by this amendment. This guidance is effective for interim and annual reporting periods beginning after December 15, 2015. The Company does not expect the application of this guidance to have a material impact on the Company’s financial statements.

Business_Combinations

Business Combinations	3 Months Ended
	Mar. 31, 2015
Business Combinations [Abstract]
Business Combinations	2. BUSINESS COMBINATIONS
	Alliance Bancorp, Inc. of Pennsylvania
	On March 3, 2015, we announced the signing of a definitive agreement and plan of reorganization whereby we would acquire Alliance Bancorp Inc. of Pennsylvania and its wholly owned bank subsidiary, Alliance Bank. Upon the closing of the transaction, Alliance Bancorp, Inc. of Pennsylvania will merge into the Company and Alliance Bank will merge into WSFS Bank. Alliance is a locally-managed institution with eight branch locations headquartered in Broomall, PA. It reported approximately $421 million in assets, $310 million in loans and $345 million in deposits as of December 31, 2014. We expect this acquisition to build our market share, expand our customer base and enhance our fee income. The acquisition is subject to approval by the shareholders of Alliance Bancorp, Inc. of Pennsylvania, regulatory approval and other customary closing conditions.
	First Wyoming Financial Corporation
	On September 5, 2014, the Company completed the merger of First Wyoming Financial Corporation (FNBW) into the Company and the merger of FNBW’s wholly-owned subsidiary, The First National Bank of Wyoming (First Wyoming) into the Bank. In accordance with the terms of the Agreement and Plan of Merger, dated November 25, 2013, holders of shares of FNBW common stock received, in aggregate, $32.0 million in cash and 452,661 shares of WSFS common stock. The transaction was valued at $64.9 million based on WSFS’ September 5, 2014 closing share price of $72.70 as quoted on NASDAQ. The results of the combined entity’s operations are included in our Consolidated Financial Statements since the date of the acquisition.
	The acquisition of FNBW was accounted for as a business combination using the acquisition method of accounting and, accordingly, assets acquired, liabilities assumed and consideration paid were recorded at their estimated fair values as of the acquisition date. The fair values are preliminary estimates and are subject to adjustment during the one year measurement period after the acquisition. While they are not expected to be materially different than those shown, any adjustments to the estimates will be reflected, retroactively, as of the date of the acquisition. The excess of consideration paid over the preliminary fair value of net assets acquired was recorded as goodwill in the amount of $16.5 million, which will not be amortizable and is not deductible for tax purposes. The Company allocated the total balance of goodwill to its WSFS Bank segment. The Company also recorded $3.2 million in core deposit intangibles which are being amortized over ten years using an accelerated depreciation method. For additional information regarding this business combination, please see Note 2 in our Annual Report on Form 10-K for the year ended December 31, 2014.
	In connection with the merger, the consideration paid and the fair value of identifiable assets acquired and liabilities assumed, as of the date of acquisition, are summarized in the following table:
	(In Thousands)	Fair Value
	Consideration Paid:
	Common shares issued (452,661)	$	32,908
	Cash paid to FNBW stockholders		32,028
	Value of consideration		64,936
	Assets acquired:
	Cash and due from banks		40,605
	Investment securities		41,822
	Loans		175,894
	Premises and equipment		1,644
	Deferred income taxes		3,139
	Bank owned life insurance		12,576
	Core deposit intangible		3,240
	Other Real Estate Owned		1,593
	Other assets		4,766
	Total assets		285,279
	Liabilities assumed:
	Deposits		228,844
	FHLB advances		5,052
	Other liabilities		2,990
	Total liabilities		236,886
	Net assets acquired:		48,393
	Goodwill resulting from acquisition of FNBW:	$	16,543
	The following table details the changes to goodwill:
	(In Thousands)	Fair Value
	Goodwill resulting from the acquisition of FNBW reported as of December 31, 2014	$	16,370
	Effects of adjustments to:
	Assets		173
	Liabilities		—
	Final purchase price		—
	Adjusted goodwill resulting from the acquisition of FNBW as of March 31, 2015	$	16,543
	The adjustments made to goodwill during the first quarter of 2015, reflect new or updated information that resulted from a change in the fair value of the loans acquired, bank owned life insurance and OREO properties.
	Direct costs related to the acquisition were expensed as incurred. During the three months ended March 31, 2015, the Company incurred $35,000 in integration expenses, including $16,000 in equipment expense, $10,000 in salary and benefits, $3,000 in professional fees and $3,000 in data processing expense. During the three months ended March 31, 2014, the Company incurred $247,000 in integration expenses of which $237,000 were professional fees.

Earnings_Per_Share

Earnings Per Share	3 Months Ended
	Mar. 31, 2015
Earnings Per Share [Abstract]
Earnings Per Share	3. EARNINGS PER SHARE
	The following table shows the computation of basic and diluted earnings per share:
		For the three months ended
		March 31,
	(In Thousands, Except Per Share Data)	2015		2014
	Numerator:
	Net income	$	12,889	$	16,911
	Denominator:
	Weighted average basic shares		9,406		8,904
	Dilutive potential common shares		178		224
	Weighted average fully diluted shares		9,584		9,128
	Earnings per share:
	Basic	$	1.37	$	1.9
	Diluted	$	1.34	$	1.85
	Outstanding common stock equivalents having no dilutive effect		79		44

Investment_Securities

Investment Securities	3 Months Ended
	Mar. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Investment Securities	4. INVESTMENT SECURITIES
	The following tables detail the amortized cost and the estimated fair value of our investment securities classified as available-for-sale and held-to-maturity. None of our investment securities are classified as trading.
				Gross		Gross
		Amortized		Unrealized		Unrealized			Fair
	(In Thousands)	Cost		Gain		Loss			Value
	Available-for-Sale Securities:
	March 31, 2015
	U.S. Government and government sponsored enterprises (GSE)	$	35,030	$	51	$	12		$	35,069
	Collateralized Mortgage Obligations (CMO)		219,054		2,491		524			221,021
	Federal National Mortgage Association (FNMA) MBS		300,690		3,627		190			304,127
	Federal Home Loan Mortgage Corporation (FHLMC) MBS		149,799		1,337		122			151,014
	Government National Mortgage Association (GNMA) MBS		74,293		1,022		49			75,266
		$	778,866	$	8,528	$	897		$	786,497
	(In Thousands)
	Available-for-Sale Securities:
	December 31, 2014
	GSE	$	30,020	$	14	$	74		$	29,960
	CMO		193,672		874		1,614			192,932
	FNMA MBS		291,606		2,053		1,106			292,553
	FHLMC MBS		146,742		672		532			146,882
	GNMA MBS		77,364		701		268			77,797
		$	739,404	$	4,314	$	3,594		$	740,124
				Gross		Gross
		Amortized		Unrealized		Unrealized			Fair
	(In Thousands)	Cost		Gain		Loss			Value
	Held-to-Maturity Securities
	March 31, 2015
	State and political subdivisions	$	122,887	$	422	$	538		$	122,771
	December 31, 2014
	State and political subdivisions	$	126,168	$	3	$	—		$	126,171
	At December 31, 2014, 161 municipal securities with a fair value of $124.9 million were transferred from available-for-sale to held-to-maturity. At March 31, 2015, the amortized cost of held-to-maturity investments consisted of the following:
		Original		Unrealized					Amortized
				Gain
	(In Thousands)	Cost		at Transfer		Accretion			Cost
	Transferred securities	$	118,204	$	3,559	$	(171	)	$	121,592
	Other held-to-maturity securities		1,295		—		—			1,295
	Total	$	119,499	$	3,559	$	(171	)	$	122,887
	The scheduled maturities of investment securities available-for-sale and held-to-maturity at March 31, 2015 and December 31, 2014 are presented in the table below:
		Available-for-Sale
	(In Thousands)	Amortized		Fair
	March 31, 2015	Cost		Value
	Within one year	$	10,000	$	10,008
	After one year but within five years		28,045		28,071
	After five years but within ten years		146,878		148,062
	After ten years		593,943		600,356
		$	778,866	$	786,497
	December 31, 2014
	Within one year	$	10,000	$	10,014
	After one year but within five years		20,020		19,946
	After five years but within ten years		134,453		133,395
	After ten years		574,931		576,769
		$	739,404	$	740,124
		Held-to-Maturity
	(In Thousands)	Amortized		Fair
	March 31, 2015	Cost		Value
	Within one year	$	3,761	$	3,764
	After one year but within five years		3,636		3,642
	After five years but within ten years		9,310		9,405
	After ten years		106,180		105,960
		$	122,887	$	122,771
	December 31, 2014
	Within one year	$	3,608	$	3,608
	After one year but within five years		6,217		6,217
	After five years but within ten years		9,733		9,736
After ten years		106,610		106,610
	$	126,168	$	126,171
Mortgage-backed securities (MBS) have expected maturities that differ from their contractual maturities. These differences arise because borrowers have the right to call or prepay obligations with or without a prepayment penalty.
Investment securities with fair market values aggregating $423.9 million and $470.4 million were pledged as collateral for retail customer repurchase agreements, municipal deposits, and other obligations as of March 31, 2015 and December 31, 2014, respectively. From time to time, investment securities are also pledged as collateral for FHLB borrowings. There were no FHLB pledged investment securities at March 31, 2015 and December 31, 2014.
During the first three months of 2015 and 2014, we sold $37.4 million and $37.8 million of investment securities categorized as available-for-sale, for gains of $451,000 and $578,000, respectively. No losses were incurred from sales that occurred during the first three months of 2015 and 2014.
As of March 31, 2015 and December 31, 2014, our investment securities portfolio had remaining unamortized premiums of $22.5 million and $22.4 million and $66,000 and $188,000 of unaccreted discounts, respectively.
For these investment securities with unrealized losses, the table below shows our gross unrealized losses and fair value by investment category and length of time that individual securities were in a continuous unrealized loss position at March 31, 2015 and December 31, 2014:
	Duration of Unrealized Loss Position
	Less than 12 months				12 months or longer					Total
(In Thousands)	Fair		Unrealized		Fair			Unrealized		Fair		Unrealized
March 31, 2015	Value		Loss		Value			Loss		Value		Loss
GSE	$	8,010	$	12	$	—		$	—	$	8,010	$	12
CMO		23,240		71		29,601			453		52,841		524
FNMA MBS		48,218		190		—			—		48,218		190
FHLMC MBS		22,756		36		4,373			86		27,129		122
GNMA MBS		—		—		2,632			49		2,632		49
State and political subdivisions		67,608		538		—			—		67,608		538
Total temporarily impaired investments	$	169,832	$	847	$	36,606		$	588	$	206,438	$	1,435
December 31, 2014
GSE	$	19,945	$	74	$	—		$	—	$	19,945	$	74
CMO		15,492		108		61,630			1,506		77,122		1,614
FNMA MBS		—		—		103,207			1,106		103,207		1,106
FHLMC MBS		23,901		54		58,267			478		82,168		532
GNMA MBS		—		—		48,312			268		48,312		268
Total temporarily impaired investments	$	59,338	$	236	$	271,416		$	3,358	$	330,754	$	3,594
There were no held-to-maturity investment securities in an unrealized loss position as of December 31, 2014.
All securities, with the exception of two, were AA-rated or better at the time of purchase and remained investment grade at March 31, 2015. In December 2014, we purchased a BBB- bond with a fair market value of $1.3 million as part of a financing transaction for an ongoing lending relationship. All securities were evaluated for OTTI at March 31, 2015 and December 31, 2014. The result of this evaluation showed no OTTI as of March 31, 2015 or December 31, 2014. The weighted average duration of MBS was 3.8 years at March 31, 2015.
At March 31, 2015, we owned investment securities totaling $206.4 million in which the amortized cost basis exceeded fair value. Total unrealized losses on these securities were $1.4 million at March 31, 2015. The temporary impairment is the result of changes in market interest rates subsequent to the purchase of the securities. Our investment portfolio is reviewed each quarter for indications of other than temporary impairment. This review includes analyzing the length of time and the extent to which the fair value has been lower than the amortized cost, the financial condition and near-term prospects of the issuer, including any specific events which may influence the operations of the issuer and our intent and ability to hold the investment for a period of time sufficient to allow for full recovery of the unrealized loss. We evaluate our intent and ability to hold securities based upon our investment strategy for the particular type of security and our cash flow needs, liquidity position, capital adequacy and interest rate risk position. In addition, we do not have the intent to sell, nor is it more likely-than-not we will be required to sell these securities before we are able to recover the amortized cost basis.

Loans

Loans	3 Months Ended
	Mar. 31, 2015
Receivables [Abstract]
Loans	5. LOANS
	The following details our loan portfolio by category:
		March 31,			December 31
	(In Thousands)	2015			2014
	Commercial	$	923,070		$	920,072
	Owner occupied commercial		797,400			788,598
	Commercial mortgages		820,836			805,459
	Construction		153,224			142,497
	Residential		216,197			218,329
	Consumer		324,232			327,543
		$	3,234,959		$	3,202,498
	Less:
	Deferred fees, net	$	6,314		$	6,420
	Allowance for loan losses		39,507			39,426
	Net loans	$	3,189,138		$	3,156,652
	Acquired Credit Impaired Loans
	The following table details the loans acquired through the FNBW merger on September 5, 2014 that are accounted for in accordance with FASB ASC 310-30, Loans and Debt Securities Acquired with Deteriorated Credit Quality (ASC 310-30).
	(In Thousands)
	Contractually required principal and interest at acquisition	$	27,086
	Contractual cash flows not expected to be collected (nonaccretable difference)		7,956
	Expected cash flows at acquisition		19,130
	Interest component of expected cash flows (accretable yield)		1,790
	Fair value of acquired loans accounted for under FASB ASC 310-30	$	17,340
	The following is the outstanding principal balance and carrying amounts for acquired credit impaired loans for which the company applies ASC 310-30 as of March 31, 2015.
	(In Thousands)
	Outstanding principal balance	$	21,925
	Carrying amount	$	15,336
	Allowance for Loan loss		N/A
	The following table presents the changes in accretable yield on the acquired credit impaired loans from January 1, 2015 to March 31, 2015.
	(In Thousands)
	Balance at beginning of period	$	1,498
	Accretion		(179	)
	Additions/adjustments		(3	)
	Balance at the end of the period	$	1,316

Allowance_for_Loan_Losses_and_

Allowance for Loan Losses and Credit Quality Information	3 Months Ended
	Mar. 31, 2015
Text Block [Abstract]
Allowance for Loan Losses and Credit Quality Information	6. ALLOWANCE FOR LOAN LOSSES AND CREDIT QUALITY INFORMATION
	Allowance for Loan Losses
	We maintain an allowance for loan losses (allowance) and charge losses to this allowance when such losses are realized. We established our allowance for loan losses in accordance with guidance provided in the SEC’s Staff Accounting Bulletin 102 (SAB 102) and FASB ASC 450, Contingencies (ASC 450). The determination of the allowance for loan losses requires significant judgment reflecting our best estimate of impairment related to specifically identified impaired loans as well as probable loan losses in the remaining loan portfolio. Our evaluation is based upon a continuing review of these portfolios. The following are included in our allowance for loan losses:
		•		Specific reserves for impaired loans
		•		An allowance for each pool of homogenous loans based on historical loss experience
		•		Adjustments for qualitative and environmental factors allocated to pools of homogenous loans
		•		Allowance for model estimation and complexity risk
	When it is probable that the Bank will be unable to collect all amounts due (interest and principal) in accordance with the contractual terms of the loan agreement, it assigns a specific reserve to that loan, if necessary. Unless loans are well-secured and collection is imminent, loans greater than 90 days past due are deemed impaired and their respective reserves are generally charged-off once the loss has been confirmed. Estimated specific reserves are based on collateral values, estimates of future cash flows or market valuations. During the three months ended March 31, 2015 net charge-offs totaled $705,000, or 0.09% of average loans, compared to $2.5 million, or 0.34% of average loans, during the three months ended March 31, 2014. We charge loans off when they are deemed to be uncollectible.
	Allowances for pooled homogeneous loans, that are not deemed impaired, are based on historical net loss experience. Estimated losses for pooled portfolios are determined differently for commercial loan pools and retail loan pools. Commercial loans are pooled into the following segments: commercial, owner-occupied, commercial real estate and construction. Each pool is further segmented by internally assessed risk ratings. Loan losses for commercial loans are estimated by determining the probability of default and expected loss severity upon default. Probability of default is calculated based on the historical rate of migration to impaired status during the last 17 quarters. During the quarter ended March 31, 2015 we increased the look-back period to 17 quarters rather than the 16 quarters used at December 31, 2014. Loss severity is calculated as the actual loan losses (net of recoveries) on impaired loans in the respective pool during the same time frame. Retail loans are pooled into the following segments: residential mortgage and consumer loans. Pooled reserves for retail loans are calculated based solely on the previous four year average net loss rate.
	Qualitative adjustment factors consider various current internal and external conditions which are allocated among loan types and take into consideration the following:
		•		Current underwriting policies, staff, and portfolio mix
		•		Internal trends of delinquency, nonaccrual and criticized loans by segment
		•		Risk rating accuracy, control and regulatory assessments/environment
		•		General economic conditions - locally and nationally
		•		Market trends impacting collateral values
		•		A competitive environment as it could impact loan structure and underwriting
	The above factors are based on their relative standing compared to the period in which historic losses are used in core reserve estimates and current directional trends. Each individual qualitative factor in our model can add or subtract to core reserves. A special adjustment factor of 10 basis points was created within consumer secured for incremental losses associated with the Home Equity Line of Credit End of Draw bubble not captured within the Bank’s loan loss histories. A special adjustment factor to address the absence of a default history for C&I loans remains unchanged from the prior quarter at 7.5 basis points. These additional adjustment factors contributed $1.0 million to the total allowance.
	The allowance methodology uses a loss emergence period (the period of time between an event that triggers the probability of a loss and the confirmation of the loss, (LEP), of nine quarters for commercial portfolios and four quarters for consumer portfolios.
	The final component of the allowance is a reserve for model estimation and complexity risk. The calculation of this reserve is generally quantitative; however, qualitative estimates of valuations and risk assessment, and methodology judgements are necessary. We review the qualitative estimates of valuation factors quarterly and management uses its judgment to make adjustments based on current trends. The model complexity risk factor was 5 basis points of total loans for March 31, 2015.
	Our loan officers and risk managers meet at least quarterly to discuss and review the conditions and risks associated with individual problem loans. In addition, various regulatory agencies periodically review our loan ratings and allowance for loan losses and the Bank’s internal loan review department performs loan reviews.
	The following tables provide the activity of our allowance for loan losses and loan balances for three months ended March 31, 2015 and 2014:
						Owner-			Commercial												Complexity
						Occupied			Mortgages												Risk (1)
	(In Thousands)		Commercial			Commercial						Construction			Residential			Consumer						Total
	Three months ended March 31, 2015
	Allowance for loan losses
	Beginning balance		$	12,837		$	6,643		$	7,266		$	2,596		$	2,523		$	6,041		$	1,520		$	39,426
	Charge-offs			(131	)		(330	)		(39	)		—			(125	)		(450	)		—			(1,075	)
	Recoveries			26			4			79			49			11			201			—			370
	Provision (credit)			316			722			(782	)		307			(29	)		234			18			786
	Ending balance		$	13,048		$	7,039		$	6,524		$	2,952		$	2,380		$	6,026		$	1,538		$	39,507
	Period-end allowance allocated to:
	Loans individually evaluated for impairment		$	3,169		$	284		$	223		$	210		$	751		$	197		$	—		$	4,834
	Loans collectively evaluated for impairment			9,879			6,755			6,301			2,742			1,629			5,829			1,538			34,673
	Ending balance		$	13,048		$	7,039		$	6,524		$	2,952		$	2,380		$	6,026		$	1,538		$	39,507
	Period-end loan balances evaluated for:
	Loans individually evaluated for impairment		$	11,707		$	1,552		$	7,595		$	1,419		$	14,749		$	6,157		$	—		$	43,179	(2)
	Loans collectively evaluated for impairment			876,434			754,044			770,991			138,495			184,337			310,427			—			3,034,728
	Acquired nonimpaired loans			31,737			39,671			36,373			9,680			16,615			7,640			—			141,716
	Acquired impaired loans			3,192			2,133			5,877			3,630			496			8			—			15,336
	Ending balance		$	923,070		$	797,400		$	820,836		$	153,224		$	216,197		$	324,232		$	—		$	3,234,959	(3)
						Owner-			Commercial												Complexity
						Occupied			Mortgages												Risk (1)
	(In Thousands)		Commercial			Commercial						Construction			Residential			Consumer						Total
	Three months ended March 31, 2014
	Allowance for loan losses
	Beginning balance		$	12,751		$	7,638		$	6,932		$	3,326		$	3,078		$	6,494		$	1,025		$	41,244
	Charge-offs			(1,113	)		(197	)		(160	)		(88	)		(364	)		(1,233	)		—			(3,155	)
	Recoveries			324			6			37			7			18			217			—			609
	Provision (credit)			442			1,342			554			(529	)		33			771			17			2,630
	Ending balance		$	12,404		$	8,789		$	7,363		$	2,716		$	2,765		$	6,249		$	1,042		$	41,328
	Period-end allowance allocated to:
	Loans individually evaluated for impairment		$	1,865		$	1,191		$	1,019		$	—		$	807		$	186			—		$	5,068
	Loans collectively evaluated for impairment			10,539			7,598			6,344			2,716			1,958			6,063			1,042			36,260
	Ending balance		$	12,404		$	8,789		$	7,363		$	2,716		$	2,765		$	6,249		$	1,042		$	41,328
	Period-end loan balances evaluated for:
	Loans individually evaluated for impairment		$	4,583		$	6,318			15,786		$	1,070			18,413		$	5,537			—		$	51,707	(2)
	Loans collectively evaluated for impairment			833,598			792,895			730,543			100,415			199,740			295,774			—			2,952,965
	Ending balance		$	838,181		$	799,213		$	746,329		$	101,485		$	218,153		$	301,311		$	—		$	3,004,672	(3)
	-1	Represents the portion of the allowance for loan losses established to account for the inherent complexity and uncertainty of estimates.
	-2	The difference between this amount and nonaccruing loans represents accruing troubled debt restructured loans of $ 22.5 million and $11.6 million for the periods ending March 31, 2015 and March 31, 2014, respectively. Accruing troubled debt restructured loans are considered impaired loans.
	-3	Ending loan balances do not include deferred costs.
	Nonaccrual and Past Due Loans
	Nonaccruing loans are those on which the accrual of interest has ceased. We discontinue accrual of interest on originated loans after payments become more than 90 days past due or earlier if we do not expect the full collection of principal or interest in accordance with the terms of the loan agreement. Interest accrued but not collected at the date a loan is placed on nonaccrual status is reversed and charged against interest income. In addition, the accretion of net deferred loan fees is suspended when a loan is placed on nonaccrual status. Subsequent cash receipts are applied either to the outstanding principal balance or recorded as interest income, depending on our assessment of the ultimate collectability of principal and interest. Loans greater than 90 days past due and still accruing are defined as loans contractually past due 90 days or more as to principal or interest payments, but remain in accrual status because they are considered well secured and in the process of collection.
The following tables show our nonaccrual and past due loans at the dates indicated:
March 31, 2015		30–59 Days			60–89 Days			Greater Than			Total Past			Accruing			Acquired			Nonaccrual			Total
(In Thousands)		Past Due and			Past Due and			90 Days			Due			Current			Impaired			Loans			Loans
		Still Accruing			Still Accruing			Past Due and			And Still			Balances			Loans
								Still Accruing			Accruing
Commercial		$	3,085		$	9		$	—		$	3,094		$	914,677		$	3,192		$	2,107		$	923,070
Owner-Occupied commercial			1,362			—			—			1,362			792,353			2,133			1,552			797,400
Commercial mortgages			—			—			100			100			807,351			5,877			7,508			820,836
Construction			—			—			—			—			149,594			3,630			—			153,224
Residential			3,618			674			492			4,784			204,690			496			6,227			216,197
Consumer			739			191			102			1,032			319,905			8			3,287			324,232
Total (1)		$	8,804		$	874		$	694		$	10,372		$	3,188,570		$	15,336		$	20,681		$	3,234,959
% of Total Loans			0.27	%		0.03	%		0.02	%		0.32	%		98.57	%		0.47	%		0.64	%		100	%
-1	The balances of above include $141.7 million of acquired nonimpaired loans.
December 31, 2014		30–59 Days			60–89 Days			Greater Than			Total			Accruing			Acquired			Nonaccrual			Total
(In Thousands)		Past Due and			Past Due and			90 Days			Past			Current			Impaired			Loans			Loans
		Still Accruing			Still Accruing			Past Due and			Due			Balances			Loans
								Still Accruing			And Still
											Accruing
Commercial		$	715		$	—		$	—		$	715		$	913,382		$	3,269		$	2,706		$	920,072
Owner-Occupied commercial			393			—			—			393			783,466			2,264			2,475			788,598
Commercial mortgages			203			—			—			203			791,035			5,976			8,245			805,459
Construction			—			—			—			—			138,634			3,863			—			142,497
Residential			3,879			604			—			4,483			206,266			512			7,068			218,329
Consumer			1,241			342			4			1,587			322,390			9			3,557			327,543
Total (1)		$	6,431		$	946		$	4		$	7,381		$	3,155,173		$	15,893		$	24,051		$	3,202,498
% of Total Loans			0.20	%		0.03	%		—	%		0.23	%		98.52	%		0.50	%		0.75	%		100	%
-1	The balances of above include $145.8 million of acquired nonimpaired loans
Impaired Loans
Loans for which it is probable we will not collect all principal and interest due according to their contractual terms, which is assessed based on the credit characteristics of the loan and/or payment status, are measured for impairment in accordance with the provisions of SAB 102 and FASB ASC 310, Receivables (ASC 310). The amount of impairment is required to be measured using one of three methods: (1) the present value of expected future cash flows discounted at the loan’s effective interest rate; (2) the fair value of collateral, if the loan is collateral dependent or (3) the loan’s observable market price. If the measure of the impaired loan is less than the recorded investment in the loan, a related allowance is allocated for the impairment.
The following tables provide an analysis of our impaired loans at March 31, 2015 and December 31, 2014:
March 31, 2015		Ending			Loans with			Loans with			Related			Contractual			Average
(In Thousands)		Loan			No Related			Related			Reserve			Principal			Loan
		Balances			Reserve (1)			Reserve						Balances			Balances
Commercial		$	11,707		$	592		$	11,115		$	3,169		$	12,491		$	7,293
Owner-occupied commercial			1,552			1,268			284			284			2,625			3,732
Commercial mortgages			7,595			4,167			3,428			223			10,516			10,792
Construction			1,419			—			1,419			210			1,419			1,065
Residential			14,749			7,987			6,762			751			16,815			16,676
Consumer			6,157			4,875			1,282			197			6,768			6,051
Total		$	43,179		$	18,889		$	24,290		$	4,834		$	50,634		$	45,609
December 31, 2014		Ending			Loans with			Loans with			Related			Contractual			Average
(In Thousands)		Loan			No Related			Related			Reserve			Principal			Loan
		Balances			Reserve (1)			Reserve						Balances			Balances
Commercial		$	12,381		$	580		$	11,801		$	3,034		$	20,924		$	5,952
Owner-occupied commercial			2,474			1,865			609			609			3,708			4,461
Commercial mortgages			8,335			4,732			3,603			319			14,383			11,005
Construction			1,419			—			1,419			334			1,419			1,013
Residential			15,666			7,068			8,598			790			18,967			17,296
Consumer			6,376			3,557			2,819			231			7,162			5,902
Total		$	46,651		$	17,802		$	28,849		$	5,317		$	66,563		$	45,629
-1	Reflects loan balances at or written down to their remaining book balance.
Interest income of $472,000 and $353,000 was recognized on impaired loans during the three months ended March 31, 2015 and 2014, respectively.
As of March 31, 2015, there were 28 residential loans and 15 commercial loans in the process of foreclosure. The total outstanding balance on the loans was $3.1 million and $3.3 million, respectively. As of December 31, 2014, there were 36 residential loans and 12 commercial loans in the process of foreclosure. The total outstanding balance on the loans was $4.4 million and $1.1 million, respectively
Reserves on Acquired Nonimpaired Loans
In accordance with FASB ASC 310-40, loans acquired by the Bank through its merger with FNBW are required to be reflected on the balance sheet at their fair values as opposed to their contractual values on the date of acquisition. Therefore, on the date of acquisition establishing an allowance for acquired loans is prohibited. After the acquisition date the Bank performs a separate allowance analysis on a quarterly basis to determine if an allowance for loan loss is necessary. Should the credit risk calculated exceed the purchased loan portfolio’s remaining credit mark, additional reserves will be added to the Bank’s allowance. When a purchased loan becomes impaired after its acquisition, it is evaluated as part of the Bank’s reserve analysis and a specific reserve is established to be included in the Bank’s allowance.
Credit Quality Indicators
Below is a description of each of our risk ratings for all commercial loans:
Pass. These borrowers presently show no current or potential problems and their loans are considered fully collectible.
Special Mention. Borrowers have potential weaknesses that deserve management’s close attention. Borrowers in this category may be experiencing adverse operating trends, for example, declining revenues or margins, high leverage, tight liquidity, or increasing inventory without increasing sales. These adverse trends can have a potential negative effect on the borrower’s repayment capacity. These assets are not adversely classified and do not expose the Bank to significant risk that would warrant a more severe rating. Borrowers in this category may also be experiencing significant management problems, pending litigation, or other structural credit weaknesses.
Substandard. Borrowers have well-defined weaknesses that require extensive oversight by management. Borrowers in this category may exhibit one or more of the following: inadequate debt service coverage, unprofitable operations, insufficient liquidity, high leverage, and weak or inadequate capitalization. Relationships in this category are not adequately protected by the sound financial worth and paying capacity of the obligor or the collateral pledged on the loan, if any. The distinct possibility exists that the Bank will sustain some loss if the deficiencies are not corrected.
Doubtful. Borrowers have well-defined weaknesses inherent in the Substandard category with the added characteristic that the possibility of loss is extremely high. Current circumstances in the credit relationship make collection or liquidation in full highly questionable. A doubtful asset has some pending event that may strengthen the asset that defers the loss classification. Such impending events include: perfecting liens on additional collateral, obtaining collateral valuations, an acquisition or liquidation preceding, proposed merger, or refinancing plan.
Loss. Borrowers are uncollectible or of such negligible value that continuance as a bankable asset is not supportable. This classification does not mean that the asset has absolutely no recovery or salvage value, but rather that it is not practical to defer writing off this asset even though partial recovery may be recognized sometime in the future.
Residential and Consumer Loans
The residential and consumer loan portfolios are monitored on an ongoing basis using delinquency information and loan type as credit quality indicators. These credit quality indicators are assessed in the aggregate in these relatively homogeneous portfolios. Loans that are greater than 90 days past due are generally considered nonperforming and placed on nonaccrual status.
Commercial Credit Exposure
								Owner-Occupied						Commercial												Total
(In Thousands)		Commercial						Commercial						Mortgages						Construction						Commercial(1)
																										March 31,					December 31,
		Mar. 31			Dec. 31			Mar. 31			Dec. 31			Mar. 31			Dec. 31			Mar. 31			Dec. 31			2015					2014
		2015			2014			2015			2014			2015			2014			2015			2014			Amount		%			Amount		%
Risk Rating:
Special mention		$	6,085		$	4,744		$	18,858		$	6,989		$	9,048		$	9,065		$	—		$	—		$	33,991				$	20,798
Substandard:
Accrual			49,520			42,377			15,677			14,436			4,527			9,167			1,304			1,085			71,028					67,065
Nonaccrual			811			1,225			1,268			1,865			7,284			7,927									9,363					11,017
Doubtful/nonaccrual			3,169			3,034			284			609			223			319			210			334			3,886					4,296
Total Special and Substandard			59,585			51,380			36,087			23,899			21,082			26,478			1,514			1,419			118,268		4	%		103,176		4	%
Acquired impaired			3,192			3,269			2,133			2,264			5,877			5,976			3,630			3,863			14,832		1			15,372		—
Pass			860,293			865,423			759,180			762,435			793,877			773,005			148,080			137,215			2,561,430		95			2,538,078		96
Total		$	923,070		$	920,072		$	797,400		$	788,598		$	820,836		$	805,459		$	153,224		$	142,497		$	2,694,530		100	%	$	2,656,626		100	%
-1	Table includes $117.5 million and $119.8 million of acquired nonimpaired loans as of March 31, 2015 and December 31, 2014, respectively.
Consumer Credit Exposure
(In Thousands)		Residential						Consumer						Total Residential and Consumer(2)
		Mar 31.			Dec. 31			Mar 31.			Dec. 31			March 31, 2015						December 31, 2014
		2015			2014			2015			2014			Amount			Percent			Amount			Percent
Nonperforming(1)		$	14,749		$	15,666		$	6,157		$	6,376		$	20,906			4	%	$	22,042			4	%
Acquired impaired Loans			496			512			8			9			504						521
Performing			200,952			202,151			318,067			321,158			519,019			96			523,309			96
Total		$	216,197		$	218,329		$	324,232		$	327,543		$	540,429			100	%	$	545,872			100	%
-1	Includes $11.4 million as of March 31, 2015 and $11.4 million as of December 31, 2014 of troubled debt restructured mortgages and home equity installment loans that are performing in accordance with the loans’ modified terms and are accruing interest.
-2	Total includes $24.3 million and $26.0 million in acquired nonimpaired loans as of March 31, 2015 and December 31, 2014, respectively.
Troubled Debt Restructurings (TDR)
TDRs are recorded in accordance with FASB ASC 310-40, Troubled Debt Restructuring by Creditors (ASC 310-40). The balance of TDRs at March 31, 2015 and December 31, 2014 was $34.8 million and $36.2 million, respectively. The balance at March 31, 2015 included approximately $12.3 million of TDRs in nonaccrual status and $22.5 million of TDRs in accrual status compared to $13.6 million in nonaccrual status and $22.6 million in accrual status at December 31, 2014. Approximately $4.3 million and $4.2 million in related reserves have been established for these loans at March 31, 2015 and December 31, 2014, respectively.
During the three months ended March 31, 2015, six loans were classified as TDRs. One was a consumer loan in which the maturity date was modified. Five were discharged bankruptcies of which three were residential real estate and two were consumer loans. Our concessions on restructured loans typically consist of forbearance agreements, reduction in interest rates or extensions of maturities. Principal balances are generally not forgiven when a loan is modified as a TDR. Nonaccruing restructured loans remain in nonaccrual status until there has been a period of sustained repayment performance, typically six months and payment is reasonably assured.
The following table presents loans identified as TDRs during the three months ended March 31, 2015 and 2014:
		Three			Three
		Months Ended			Months Ended
		March 31,			March 31,
(In Thousands)		2015			2014
Commercial		$	—		$	—
Commercial mortgages			—			—
Construction			—			—
Residential			212			279
Consumer			135			363
Total		$	347		$	642
The TDR set forth in the table above did not change our allowance for loan losses through allocation of a related reserve and did not result in additional charge-offs during the three months ended March 31, 2015 compared to an increase in our allowance of $1,000 and charge-offs of $40,000 for the same period of 2014.

Reverse_Mortgage_Loans

Reverse Mortgage Loans	3 Months Ended
	Mar. 31, 2015
Mortgage Banking [Abstract]
Reverse Mortgage Loans	7. REVERSE MORTGAGE LOANS
	Reverse mortgage loans are contracts in which a homeowner borrows against the equity in his/her home and receives cash in one lump sum payment, a line of credit, fixed monthly payments for either a specific term or for as long as the homeowner lives in the home, or a combination of these options. Since reverse mortgages are nonrecourse obligations, the loan repayments are generally limited to the sale proceeds of the borrower’s residence and the mortgage balance consists of cash advanced, interest compounded over the life of the loan and some may include a premium which represents a portion of the shared appreciation in the home’s value, if any, or a percentage of the value of the residence.
	Our existing investment in reverse mortgages totaled $27.0 million at March 31, 2015. The portfolio consists of 108 loans with an average borrowers’ age of 93 years old and there is currently significant overcollateralization in the portfolio, as the realizable collateral value (the lower of collectable principal and interest, or appraised value and annual broker price opinion of the home) of $50.3 million well exceeds the outstanding book balance at March 31, 2015.
	The carrying value of the reverse mortgages is calculated by a proprietary model that uses the income approach as described in FASB ASC 820-10, Fair Value Measurements and Disclosure (ASC 820-10). The model is a present value cash flow model which describes the components of a present value measurement. The model incorporates the projected cash flows of the loans (includes payouts and collections) and then discounts these cash flows using the effective yield required on the life of the portfolio to reduce the net investment to zero at the time the final reverse mortgage contract is liquidated. The inputs to the model reflect our expectations of what other market participants would use in pricing this asset in a current transaction and therefore is consistent with ASC 820 that requires an exit price methodology for determining fair value.
	To determine the carrying value of these reverse mortgages as of March 31, 2015, we used a proprietary model and actual cash flow information to estimate future cash flows. There are three main drivers of cash flows; 1) move-out rates, 2) house price appreciation (HPA) forecasts, and 3) internal rate of return.
		1)	Move-out rates – The projections incorporate actuarial estimates of contract termination the United States Mortality Rates published by the Office of the Actuary of the United States Bureau of Census in 2014, adjusted for expected prepayments and relocations. During 2014 we updated these mortality tables to the new tables.
		2)	House Price Appreciation – Consistent with other reverse mortgage analyses from various market sources, we forecast a 2.5% increase in housing prices during 2015 and a 2.0% increase in the following year and thereafter. We believe this forecast continues to be appropriate given the nature of reverse mortgage collateral and historical under-performance to the broad housing market. Annually, during the fourth quarter, housing price estimates are updated through broker price opinions.
		3)	Internal Rate of Return – As of March 31, 2015, the internal rate of return (IRR) of 17.48% was the effective yield required on the life of the portfolio to reduce the net investment to zero at the time the final reverse mortgage contract is liquidated.
	As of March 31, 2015, the Company’s actuarially estimated cash payments to reverse mortgagors are as follows:
	(in thousands)
	Year Ending
	Remaining in 2015		$	515
	2016			548
	2017			438
	2018			344
	2019			269
	Years 2020 - 2024			633
	Years 2025 - 2029			130
	Years 2030 - 2034			20
	Thereafter			2
	Total (1)		$	2,899
	-1	This table does not take into consideration cash inflow including payments from mortgagors or payoffs based on contractual terms.
	The amount of the contract value that would be forfeited if the Company were not to make cash payments to reverse mortgagors in the future is $6.4 million.
	The future cash flows depend on the HPA assumptions. If the future changes in collateral value were assumed to be zero, income would decrease by $623,000 for the quarter ended March 31, 2015 with an IRR of 16.20%. If the future changes in collateral value were assumed to be reduced by 1%, income would decrease by $286,000 with an IRR of 16.90%.
	The net present value of the projected cash flows depends on the IRR used. If the IRR increased by 1%, the net present value would increase by $570,000. If the IRR decreased by 1%, the net present value would decrease by $561,000.

Goodwill_and_Intangibles

Goodwill and Intangibles	3 Months Ended
	Mar. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Intangibles	8. GOODWILL AND INTANGIBLES
	In accordance with FASB ASC 805, Business Combinations (ASC 805) and FASB ASC 350, Intangibles-Goodwill and Other (ASC 350), all assets and liabilities acquired in purchase acquisitions, including goodwill, indefinite-lived intangibles and other intangibles are recorded at fair value.
	During the three months ended March 31, 2015, we determined there were no events or other indicators of impairment as it relates to goodwill or other intangibles.
	The following table shows the allocation of goodwill to our reportable operating segments for purposes of goodwill impairment testing:
							Trust &
		WSFS		Cash			Wealth		Consolidated
	(In Thousands)	Bank		Connect			Management		Company
	December 31, 2014	$	43,517	$	—		$	5,134	$	48,651
	Changes in goodwill		173		—			—		173
	31-Mar-15	$	43,690	$	—		$	5,134	$	48,824
	ASC 350 also requires that an acquired intangible asset be separately recognized if the benefit of the intangible asset is obtained through contractual or other legal rights, or if the asset can be sold, transferred, licensed, rented or exchanged, regardless of the acquirer’s intent to do so.
	The following table summarizes intangible assets:
		Gross					Net
	(In Thousands)	Intangible		Accumulated			Intangible
	March 31, 2015	Assets		Amortization			Assets
	Core deposits	$	7,610	$	(3,578	)	$	4,032
	CB&T intangibles		3,142		(1,035	)		2,107
	Array and Arrow intangibles		2,353		(584	)		1,769
	Mortgage servicing rights		1,478		(841	)		637
	Total intangible assets	$	14,583	$	(6,038	)	$	8,545
	December 31, 2014
	Core deposits	$	7,610	$	(3,321	)	$	4,289
	CB&T intangibles		3,142		(985	)		2,157
	Array and Arrow intangibles		2,353		(497	)		1,856
	Mortgage servicing rights		1,455		(815	)		640
	Total intangible assets	$	14,560	$	(5,618	)	$	8,942
	Core deposits are amortized over their expected lives using the present value of the benefit of the core deposits and straight-line methods of amortization. During the three months ended March 31, 2015, we recognized amortization expense on other intangible assets of $394,000.
	The following presents the estimated amortization expense of intangibles:
	(In Thousands)	Amortization
		of Intangibles
	Remaining in 2015	$	1,074
	2016		1,238
	2017		1,091
	2018		1,072
	2019		1,055
	Thereafter		3,015
	Total	$	8,545

Associate_Employee_Benefit_Pla

Associate (Employee) Benefit Plans	3 Months Ended
	Mar. 31, 2015
Compensation and Retirement Disclosure [Abstract]
Associate (Employee) Benefit Plans	9. ASSOCIATE (EMPLOYEE) BENEFIT PLANS
	Postretirement Benefits
	We share certain costs of providing health and life insurance benefits to eligible retired Associates and their eligible dependents. Previously, all Associates were eligible for these benefits if they reached normal retirement age while working for us. Effective March 31, 2014, we changed the eligibility of this plan to include only those Associates who have achieved ten years of service with us as of March 31, 2014. The change will impact our net periodic benefit cost; however, this impact was partially offset by changes in the assumptions used to determine these costs. Compared to the prior year these changes included: a decrease in the discount rate of 100 basis points to 4%; a change in the future rates of participation from 50% to 15%; and a change to rely upon the mortality table issued by the Office of the Actuary of the United States Bureau of Census in October 2014.
	We account for our obligations under the provisions of FASB ASC 715, Compensation - Retirement Benefits (ASC 715). ASC 715 requires that the costs of these benefits be recognized over an Associate’s active working career. Amortization of unrecognized net gains or losses resulting from experience different from that assumed and from changes in assumptions is included as a component of net periodic benefit cost over the remaining service period of active employees to the extent that such gains and losses exceed 10% of the accumulated postretirement benefit obligation, as of the beginning of the year.
	The following disclosures of the net periodic benefit cost components of postretirement benefits were measured at January 1, 2015 and 2014:
		Three months ended
		March 31,
	(In Thousands)	2015			2014
	Service cost	$	15		$	88
	Interest cost		22			56
	Prior service cost amortization		(19	)		—
	Net (gain) loss recognition		(5	)		14
	Net periodic benefit cost	$	13		$	158

Income_Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2015
Income Tax Disclosure [Abstract]
Income Taxes	10. INCOME TAXES
	We account for income taxes in accordance with FASB ASC 740, Income Taxes (ASC 740). ASC 740 requires the recording of deferred income taxes that reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes. We exercise significant judgment in the evaluation of the amount and timing of the recognition of the resulting tax assets and liabilities. The judgments and estimates required for the evaluation are updated based upon changes in business factors and the tax laws. If actual results differ from the assumptions and other considerations used in estimating the amount and timing of tax recognized, there can be no assurance that additional expenses will not be required in future periods.
	As a result of the consolidation for accounting purposes of the SASCO reverse mortgage securitization trust during 2013, a deferred tax asset (DTA) of approximately $4.9 million was recorded. In addition, we recorded a $1.8 million deferred tax liability associated with our original investment in SASCO. However, because SASCO was not consolidated for income tax purposes, a full valuation allowance was also recorded on this DTA due to the uncertainty of its realization, as the realization was dependent on future taxable income. On January 27, 2014 the separate company SASCO tax structure was eliminated, which permits tax consolidation within the Bank’s tax return filings on a prospective basis. At this date, the uncertainty surrounding the realization of the DTA was eliminated. Accordingly, we removed the $4.9 million valuation allowance as well as eliminated the $1.8 million deferred tax liability, which resulted in an overall income tax benefit of $6.7 million in the quarter ended March 31, 2014.
	ASC 740 prescribes a minimum probability threshold that a tax position must meet before a financial statement benefit is recognized. We recognize, when applicable, interest and penalties related to unrecognized tax benefits in the provision for income taxes in the financial statements. Assessment of uncertain tax positions under ASC 740 requires careful consideration of the technical merits of a position based on our analysis of tax regulations and interpretations.
	There were no unrecognized tax benefits as of March 31, 2015. We record interest and penalties on potential income tax deficiencies as income tax expense. Our federal and state tax returns for the 2011 through 2014 tax years are subject to examination as of March 31, 2015. No state income tax return examinations are currently in process. We do not expect to record or realize any material unrecognized tax benefits during 2015.

Fair_Value_Disclosures_of_Fina

Fair Value Disclosures of Financial Assets and Liabilities	3 Months Ended
	Mar. 31, 2015
Fair Value Disclosures [Abstract]
Fair Value Disclosures of Financial Assets and Liabilities	11. FAIR VALUE DISCLOSURES OF FINANCIAL ASSETS AND LIABILITIES
	FAIR VALUE OF FINANCIAL ASSETS AND LIABILITIES
	ASC 820-10 defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. ASC 820-10 establishes a fair value hierarchy that prioritizes the use of inputs used in valuation methodologies into the following three levels:
	Level 1: Inputs to the valuation methodology are quoted prices, unadjusted, for identical assets or liabilities in active markets. A quoted price in an active market provides the most reliable evidence of fair value and shall be used to measure fair value whenever available.
	Level 2: Inputs to the valuation methodology include quoted prices for similar assets or liabilities in active markets; inputs to the valuation methodology include quoted prices for identical or similar assets or liabilities in markets that are not active; or inputs to the valuation methodology that are derived principally from or can be corroborated by observable market data by correlation or other means.
	Level 3: Inputs to the valuation methodology are unobservable and significant to the fair value measurement. Level 3 assets and liabilities include financial instruments whose value is determined using discounted cash flow methodologies, as well as instruments for which the determination of fair value requires significant management judgment or estimation.
	A description of the valuation methodologies used for instruments measured at fair value, as well as the general classification of such instruments pursuant to the valuation hierarchy as of March 31, 2015, is set forth in the following table:
		Quoted				Significant				Significant				Total Fair
		Prices in				Other				Unobservable
		Active				Observable				Inputs
		Markets for				Inputs
		Identical
	(In Thousands)	Asset
	Description	(Level 1)				(Level 2)				(Level 3)				Value
	Assets measured at fair value on a recurring basis
	Collateralized mortgage obligations	$	—			$	221,021			$	—			$	221,021
	FNMA		—				304,127				—				304,127
	FHLMC		—				151,014				—				151,014
	GNMA		—				75,266				—				75,266
	U.S. Government and agencies		—				35,069				—				35,069
	Total assets measured at fair value on a recurring basis	$	—			$	786,497			$	—			$	786,497
	Assets measured at fair value on a nonrecurring basis
	Other real estate owned	$	—			$	—			$	6,088			$	6,088
	Loans held-for-sale		—				46,892				—				46,892
	Impaired loans (collateral dependent)		—				—				38,795				38,795
	Total assets measured at fair value on a nonrecurring basis	$	—			$	46,892			$	44,883			$	91,775
	There were no material liabilities measured at fair value as of March 31, 2015.
	The table below presents the balances of assets measured at fair value as of December 31, 2014:
		Quoted				Significant				Significant				Total
		Prices in				Other				Unobservable
		Active				Observable				Inputs
		Markets for				Inputs
		Identical
	(In Thousands)	Asset
	Description	(Level 1)				(Level 2)				(Level 3)				Fair Value
	Assets measured at fair value on a recurring basis
	Available-for-sale securities:
	Collateralized mortgage obligations	$	—			$	192,932			$	—			$	192,932
	FNMA		—				292,553				—				292,553
	FHLMC		—				146,882				—				146,882
	GNMA		—				77,797				—				77,797
	U.S. Government and agencies						29,960				—				29,960
	Total assets measured at fair value on a recurring basis	$	—			$	740,124			$	—			$	740,124
	Assets measured at fair value on a nonrecurring basis Other real estate owned	$	—			$	—			$	5,734			$	5,734
	Loans held-for sale		—				28,508				—				28,508
	Impaired loans		—				—				41,334				41,334
	Total assets measured at fair value on a nonrecurring basis	$				$	28,508			$	47,068			$	75,576
	There were no material liabilities measured at fair value as of December 31, 2014.
	Fair value is based upon quoted market prices, where available. If such quoted market prices are not available, fair value is based upon internally developed models or obtained from third parties that primarily use, as inputs, observable market-based parameters. Valuation adjustments may be made to ensure that financial instruments are recorded at fair value. These adjustments may include unobservable parameters. Our valuation methodologies may produce a fair value calculation that may not be indicative of net realizable value or reflective of future fair values. While we believe our valuation methodologies are appropriate and consistent with other market participants, the use of different methodologies or assumptions to determine the fair value of certain financial instruments could result in a different estimate of fair value at the reporting date.
	Available-for-sale securities
	As of March 31, 2015, securities classified as available-for-sale are reported at fair value using Level 2 inputs. Included in the Level 2 total are approximately $35.1 million in Federal Agency debentures, and $751.4 million in Federal Agency MBS. We believe that this Level 2 designation is appropriate for these securities under ASC 820-10 as, with almost all fixed income securities, none are exchange traded, and all are priced by correlation to observed market data. For these securities we obtain fair value measurements from an independent pricing service. The fair value measurements consider observable data that may include dealer quotes, market spreads, cash flows, U.S. government and agency yield curves, live trading levels, trade execution data, market consensus prepayment speeds, credit information, and the security’s terms and conditions, among other factors.
	Other real estate owned
	Other real estate owned consists of loan collateral which has been repossessed through foreclosure or other measures. Initially, foreclosed assets are recorded at the lower of the loan balance or fair value of the collateral less estimated selling costs. Subsequent to foreclosure, valuations are updated periodically and the assets may be marked down further, reflecting a new cost basis. The fair value of our real estate owned was estimated using Level 3 inputs based on appraisals obtained from third parties.
	Loans held-for-sale
	During 2014 we elected to record loans held-for-sale at their fair value. As of March 31, 2015 and December 31, 2014 the fair value of our loans held-for-sale is based upon estimates using level 2 inputs. These inputs are based upon pricing information obtained from secondary markets and brokers.
	Impaired loans
	We evaluate and value impaired loans at the time the loan is identified as impaired, and the fair values of such loans are estimated using Level 3 inputs in the fair value hierarchy. Each loan’s collateral has a unique appraisal and management’s discount of the value is based on the factors unique to each impaired loan. The significant unobservable input in determining the fair value is management’s subjective discount on appraisals of the collateral securing the loan, which range from 10% - 50%. Collateral may consist of real estate and/or business assets including equipment, inventory and/or accounts receivable and the value of these assets is determined based on the appraisals by qualified licensed appraisers hired by us. Appraised and reported values may be discounted based on management’s historical knowledge, changes in market conditions from the time of valuation, estimated costs to sell, and/or management’s expertise and knowledge of the client and the client’s business.
	Impaired loans, which are measured for impairment by either calculating the expected future cash flows discounted at the loan’s effective interest rate or determining the fair value of the collateral for collateral dependent loans has a gross amount of $42.8 million and $46.7 million at March 31, 2015 and December 31, 2014, respectively. The valuation allowance on impaired loans was $4.8 million as of March 31, 2015 and $5.3 million as of December 31, 2014.
	FAIR VALUE OF FINANCIAL INSTRUMENTS
	The reported fair values of financial instruments are based on a variety of factors. In certain cases, fair values represent quoted market prices for identical or comparable instruments. In other cases, fair values have been estimated based on assumptions regarding the amount and timing of estimated future cash flows that are discounted to reflect current market rates and varying degrees of risk. Accordingly, the fair values may not represent actual values of the financial instruments that could have been realized as of period-end or that will be realized in the future.
	The following methods and assumptions were used to estimate the fair value of each class of financial instruments for which it is practicable to estimate that value:
	Cash and cash equivalents
	For cash and short-term investment securities, including due from banks, federal funds sold or purchased under agreements to resell and interest-bearing deposits with other banks, the carrying amount is a reasonable estimate of fair value.
	Investment securities
Fair value is estimated using quoted prices for similar securities, which we obtain from a third party vendor. We utilize one of the largest providers of securities pricing to the industry and management periodically assesses the inputs used by this vendor to price the various types of securities owned by us to validate the vendor’s methodology. The fair value of our investment in reverse mortgages is based on the net present value of estimated cash flows, which have been updated to reflect recent external appraisals of the underlying collateral. For additional discussion of our internally developed models, see “Fair Value of Financial Assets” in this note.
Loans held-for sale
Loans held-for- sale are carried at their fair value.
Loans
Fair values are estimated for portfolios of loans with similar financial characteristics. Loans are segregated by type: commercial, commercial mortgages, construction, residential mortgages and consumer. For loans that reprice frequently, the book value approximates fair value. The fair values of other types of loans are estimated by discounting expected cash flows using the current rates at which similar loans would be made to borrowers with comparable credit ratings and for similar remaining maturities. The fair value of nonperforming loans is based on recent external appraisals of the underlying collateral. Estimated cash flows, discounted using a rate commensurate with current rates and the risk associated with the estimated cash flows, are utilized if appraisals are not available. This technique does not contemplate an exit price.
Reverse mortgage loans
For additional information on these reverse mortgage related assets, see Note 7, Reverse Mortgage Related Assets, to the unaudited Consolidated Financial Statements.
Stock in the Federal Home Loan Bank (FHLB) of Pittsburgh
The fair value of FHLB stock is assumed to be equal to its cost basis, since the stock is non-marketable but redeemable at its par value.
Other assets
WSFS holds 50,833 shares of Visa Class B stock. Following resolution of Visa’s covered litigation, shares of Visa’s Class B stock will be converted to Visa Class A shares (the current conversion rate is 1.6483 shares of Class A stock for each share of Class B stock). As our ownership is related to our prior participation in Visa’s network, while Visa operated as a cooperative, this ownership is recorded on our books with zero basis.
While only current owners of Class B shares are allowed to purchase other Class B shares, there have been several transactions between Class B shareholders. Based on these transactions we estimate the value of our Class B shares to be $4.8 million as of March 31, 2015.
Demand deposits, savings, deposits and time deposit
The fair value deposits with no stated maturity, such as noninterest-bearing demand deposits, money market and interest-bearing demand deposits, is assumed to be equal to the amount payable on demand. The fair value of time deposits is based on the discounted value of contractual cash flows. The discount rate is estimated using rates currently offered for deposits with comparable remaining maturities.
Borrowed funds
Rates currently available to us for debt with similar terms and remaining maturities are used to estimate fair value of existing debt.
Off-balance sheet instruments
The fair value of off-balance sheet instruments, including commitments to extend credit and standby letters of credit, approximates the recorded net deferred fee amounts, which are not significant. Because commitments to extend credit and letters of credit are generally not assignable by either us or the borrower, they only have value to us and the borrower.
The book value and estimated fair value of our financial instruments are as follows:
(In Thousands)	Fair Value		March 31, 2015								December 31, 2014
	Measurement		Book Value				Fair Value				Book Value				Fair Value
Financial assets:
Cash and cash equivalents	Level 1		$	505,638				505,638			$	508,039			$	509,039
Investment securities available-for-sale	See previous			786,497				786,497				740,124				740,124
	table
Investment securities held-to-maturity	See previous			122,887				122,772				126,168				126,171
	table
Loans, held-for-sale	See previous			46,892				46,892				28,508				28,508
	table
Loans, net	Level 2			3,189,138				3,159,907				3,156,652				3,121,855
Reverse mortgage loans	Level 3			27,035				27,035				29,298				29,298
Stock in FHLB of Pittsburgh	Level 2			27,655				27,655				23,278				23,278
Accrued interest receivable	Level 2			12,004				12,004				11,782				11,782
Other assets	Level 3			—				4,837				—				4,837
Financial liabilities:
Deposits	Level 2			3,522,278				3,345,564				3,649,235				3,461,218
Borrowed funds	Level 2			874,557				877,815				667,775				672,850
Standby letters of credit	Level 3			160				160				151				151
Accrued interest payable	Level 2			1,621				1,621				1,004				1,004
At March 31, 2015 and December 31, 2014 we had no commitments to extend credit measured at fair value.

Segment_Information

Segment Information	3 Months Ended
	Mar. 31, 2015
Segment Reporting [Abstract]
Segment Information	12. SEGMENT INFORMATION
	In accordance with FASB ASC 280, Segment Reporting (ASC 280) we discuss our business in three segments. An operating segment is a component of an enterprise that engages in business activities from which it may earn revenues and incur expenses, whose operating results are regularly reviewed by the enterprise’s chief operating decision makers to make decisions about resources to be allocated to the segment and assess its performance, and for which discrete financial information is available. We evaluate performance based on pretax ordinary income relative to resources used, and allocate resources based on these results. The accounting policies applicable to our segments are those that apply to our preparation of the accompanying unaudited Consolidated Financial Statements. We have three segments: WSFS Bank, Cash Connect, and Wealth Management.
	The WSFS Bank segment provides financial products to commercial and retail customers through its 56 offices located in Delaware (45), Pennsylvania (9) Virginia (1) and Nevada (1). Retail and Commercial Banking, Commercial Real Estate Lending and other banking business units are operating departments of WSFS. These departments share the same regulator, the same market, many of the same customers and provide similar products and services through the general infrastructure of the Bank. Because of these and other reasons, these departments are not considered discrete segments and are appropriately aggregated within the WSFS Bank segment in accordance with ASC 280.
	Cash Connect provides turnkey ATM services through strategic partnerships with several of the largest networks, manufacturers and service providers in the ATM industry. The balance sheet category “Cash in non-owned ATMs” includes cash from which fee income is earned through bailment arrangements with customers of Cash Connect.
	The Wealth Management division provides a broad array of fiduciary, investment management, credit and deposit products to clients through four business lines. Wealth Investments provides insurance and brokerage products primarily to our retail banking clients. Cypress Capital Management, LLC is a registered investment advisor with over $675 million in assets under management. Cypress’ primary market segment is high net worth individuals, offering a ‘balanced’ investment style focused on preservation of capital and current income. Christiana Trust, with $8.7 billion in assets under management and administration, provides fiduciary and investment services to personal trust clients, and trustee, agency, custodial and commercial domicile services to corporate and institutional clients. WSFS Private Banking serves high net worth clients by delivering credit and deposit products and partnering with Cypress, Christiana and Wealth Investments to deliver investment management and fiduciary products and services.
	Segment information for the three months ended March 31, 2015 and March 31, 2014 follows:
	For the three months ended March 31, 2015:
	(In Thousands)	WSFS Bank		Cash		Wealth		Total
	Statement of Operations			Connect		Management
	External customer revenues:
	Interest income	$	40,823	$	—	$	2,028	$	42,851
	Noninterest income		9,189		6,639		5,267		21,095
	Total external customer revenues		50,012		6,639		7,295		63,946
	Inter-segment revenues:
	Interest income		871		—		1,447		2,318
	Noninterest income		1,784		168		18		1,970
	Total inter-segment revenues		2,655		168		1,465		4,288
	Total revenue		52,667		6,807		8,760		68,234
	External customer expenses:
	Interest expense		3,912		—		122		4,034
	Noninterest expenses		31,079		4,175		3,659		38,913
	Provision for loan loss		733		—		53		786
	Total external customer expenses		35,724		4,175		3,834		43,733
	Inter-segment expenses
	Interest expense		1,447		373		498		2,318
	Noninterest expenses		186		614		1,170		1,970
	Total inter-segment expenses		1,633		987		1,668		4,288
	Total expenses		37,357		5,162		5,502		48,021
	Income before taxes	$	15,310	$	1,645	$	3,258	$	20,213
	Income tax provision								7,324
	Consolidated net income							$	12,889
	As of March 31, 2015:
	Statement of Condition
	Cash and cash equivalents	$	66,854	$	430,888	$	7,896	$	505,638
	Goodwill		43,690		—		5,134		48,824
	Other segment assets		3,824,272		3,002		564,744		4,392,018
	Total segment assets	$	3,934,816	$	433,890	$	577,774	$	4,946,480
	Capital expenditures	$	817	$	—	$	—	$	817
	For the three months ended March 31, 2014:
	(In Thousands)	WSFS Bank		Cash Connect		Trust &		Total
	Statement of Operations					Wealth
						Management
	External customer revenues:
	Interest income	$	35,921	$	—	$	1,864	$	37,785
	Noninterest income		8,395		6,014		3,955		18,364
	Total external customer revenues		44,316		6,014		5,819		56,149
	Inter-segment revenues:
	Interest income		831		—		1,421		2,252
	Noninterest income		1,738		193		26		1,957
	Total inter-segment revenues		2,569		193		1,447		4,209
	Total revenue		46,885		6,207		7,266		60,358
	External customer expenses:
	Interest expense		3,630		—		111		3,741
	Noninterest expenses		27,318		3,550		3,016		33,884
	Provision for loan loss		2,323		—		307		2,630
	Total external customer expenses		33,271		3,550		3,434		40,255
	Inter-segment expenses
	Interest expense		1,421		331		500		2,252
	Noninterest expenses		219		586		1,152		1,957
	Total inter-segment expenses		1,640		917		1,652		4,209
	Total expenses		34,911		4,467		5,086		44,464
	Income before taxes	$	11,974	$	1,740	$	2,180	$	15,894
	Income tax (benefit)								(1,017	)
	Consolidated net income								16,911
Capital expenditures	$	478	$	56	$	3	$	537
As of December 31, 2014:
Statement of Condition
Cash and cash equivalents	$	73,395	$	431,527	$	3,117	$	508,039
Goodwill		43,517		—		5,134		48,651
Other segment assets		4,107,212		2,006		187,412		4,296,630
Total segment assets	$	4,224,124	$	433,533	$	195,663	$	4,853,320

Indemnifications_and_Guarantee

Indemnifications and Guarantees	3 Months Ended
	Mar. 31, 2015
Text Block [Abstract]
Indemnifications and Guarantees	13. INDEMNIFICATIONS AND GUARANTEES
	Secondary Market Loan Sales. Given the current interest rate environment, coupled with our desire not to hold these assets in our portfolio, we generally sell newly originated residential mortgage loans in the secondary market to mortgage loan aggregators and on a more limited basis, to GSEs such as FHLMC, FNMA, and the FHLB. Loans held-for-sale are reflected on our unaudited Consolidated Statements of Condition at fair value with changes in the value reflected in our unaudited Consolidated Statements of Cash Flows and Comprehensive Income. Gains and losses are recognized at the time of sale. We periodically retain the servicing rights on residential mortgage loans sold which result in monthly service fee income and are included in our intangible assets in our unaudited Consolidated Statements of Condition. Otherwise, we sell loans with servicing released on a nonrecourse basis. Rate-locked loan commitments that we intend to sell in the secondary market are accounted for as derivatives under the guidance promulgated in ASC 450.
	We generally do not sell loans with recourse, except for standard loan sale contract provisions covering violations of representations and warranties and, under certain circumstances, first payment default by the borrower. These are customary repurchase provisions in the secondary market for conforming mortgage loan sales. These indemnifications may include our repurchase of the loans. Repurchases and losses have been rare and no provision is made for losses at the time of sale. There were no such repurchases for the three months ended March 31, 2015.
	Swap Guarantees. We entered into agreements with three unrelated financial institutions whereby those financial institutions entered into interest rate derivative contracts (interest rate swap transactions) with customers referred to them by us. By the terms of the agreements, those financial institutions have recourse to us for any exposure created under each swap transaction in the event the customer defaults on the swap agreement and the agreement is in a paying position to the third-party financial institution. This is a customary arrangement that allows smaller financial institutions like us to provide access to interest rate swap transactions for our customers without creating the swap ourselves. These swap guarantees are accounted for as credit derivatives under ASC 450.
	At March 31, 2015, there were 108 variable-rate swap transactions between third party financial institutions and our customers, compared to 101 at December 31, 2014. The initial notional aggregated amount was approximately $431.1 million at March 31, 2015 compared to $417.9 million at December 31, 2014. At March 31, 2015 maturities ranged from approximately one month to eleven years. The aggregate market value of these swaps to the customers was a liability of $19.6 million at March 31, 2015 and $16.5 million at December 31, 2014. There were no loss liabilities established for swap guarantees as of March 31, 2015.

Change_in_Accumulated_Other_Co

Change in Accumulated Other Comprehensive Income (Loss)	3 Months Ended
	Mar. 31, 2015
Equity [Abstract]
Change in Accumulated Other Comprehensive Income (Loss)	14. CHANGE IN ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
	Accumulated other comprehensive income (loss) includes unrealized gains and losses on available-for-sale investments and unrecognized prior service costs on defined benefit pension plans. Changes to accumulated other comprehensive income (loss) are presented net of tax effect as a component of equity. Reclassification out of accumulated other comprehensive is recorded on the statement of operations either as a gain or loss.
	Changes to accumulated other comprehensive income by component are shown net of taxes in the following tables for the period indicated:
	(In Thousands)	Net unrealized			Net unrealized			Total
		(losses) gains  on			losses on defined
		investment			benefit pension
		securities			plan
		available-for-sale
	Balance, December 31, 2014	$	2,653		$	847		$	3,500
	Other comprehensive income before reclassifications		4,567			(15	)		4,552
	Less: Amounts reclassified from accumulated other comprehensive income		(280	)		—			(280	)
	Amortization of unrealized gain on securities reclassified to held-to-maturity		(171	)		—			(171	)
	Net current-period other comprehensive income		4,116			(15	)		4,101
	Balance, March 31, 2015	$	6,769		$	832		$	7,601
	Balance, December 31, 2014	$	(20,822	)	$	(472	)	$	(21,294	)
	Other comprehensive income before reclassifications		9,145			—			9,145
	Less: Amounts reclassified from accumulated other comprehensive income		(358	)		—			(358	)
	Net current-period other comprehensive income		8,787			—			8,787
	Balance, March 31, 2014	$	(12,035	)	$	(472	)	$	(12,507	)
	The statement of operations impacted by components of other comprehensive income are presented in the table below:
	(In Thousands)	Three Months Ended						Affected line item in Statements of
		March 31,						Operations
	Securities available-for-sale:	2015			2014
	Realized gains on securities transactions	$	451		$	578		Securities gains, net
	Income taxes		(171	)		(220	)	Income tax provision
	Net of tax	$	280		$	358
	Net unrealized holding gains on securities transferred between available-for-sale and held-to-maturity:
	Amortization of net unrealized gains to income during the period	$	(171	)	$	—		Interest income on investment securities
	Amortization of Defined Benefit Pension items:
	Prior service (credits) costs	$	(19	)	$	—		Salaries, benefits and other compensation
	Actuarial (gains) losses		(5	)		—		Income tax provision
	Total before tax	$	(24	)	$	—
	Income taxes		(9	)		—
	Net of tax		(15	)		—
	Total reclassifications	$	94		$	358

Legal_and_Other_Proceedings

Legal and Other Proceedings	3 Months Ended
	Mar. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Legal and Other Proceedings	15. LEGAL AND OTHER PROCEEDINGS
	As initially disclosed in 2011, we were served with a complaint, filed in the U.S. Bankruptcy Court for the Eastern District of Pennsylvania, by a bankruptcy trustee relating to a former WSFS Bank customer. The complaint challenges the Bank’s actions relating to the repayment of an outstanding loan and also seeks to avoid and recover the pre-bankruptcy repayment of that loan, approximately $5.0 million. The matter has been captioned Goldstein v. Wilmington Savings Fund Society, FSB (In re: Universal Marketing, Inc.), Chapter 7, Case No. 09-15404 (ELF), Adv. Pro. No. 11-00512. We believe we acted appropriately and we are vigorously defending ourselves against the complaint.
	Based upon available information we believe the estimate of the aggregate range of reasonably possible losses for this legal proceeding is from approximately $0 to approximately $5.0 million at March 31, 2015. Costs of litigation were initially covered by insurance; however, such costs have now exceeded the limits of insurance coverage for this case. Cross motions for summary judgment are currently pending before the court.
	On November 25, 2014, we were served with a complaint from a vendor seeking damages of $800,000 plus attorney’s fees, due to an alleged breach of contract. The parties agreed to mediate the dispute and during April of 2015, this issue was settled. The cost of the settlement was not material and was fully accrued for in our first quarter results.
	Three purported shareholder derivative and class action complaints relating to the pending merger with Alliance Bancorp, Inc. of Pennsylvania have been filed. These actions, Parshall v. Stonier et al. (filed on April 20, 2015), Sloss v. Cirucci et al. (filed on May 4, 2015), and Hewes v. Cirucci et al. (filed on May 4, 2015) were all filed in the Court of Common Pleas of Delaware County, Pennsylvania. The complaints name as defendants Alliance Bancorp, Inc. of Pennsylvania, its directors and certain of its officers, and the Company. The complaints in the merger litigation allege that the members of the board of directors of Alliance Bancorp, Inc. of Pennsylvania breached their fiduciary duties to Alliance shareholders by approving the merger for inadequate consideration, approving the transaction in order to obtain benefits for Alliance directors and officers that are not equally shared by other Alliance shareholders, entering into the merger agreement containing preclusive deal protection devices, and failing to take steps to maximize the value to be paid to the Alliance shareholders. The complaints also allege claims against the Company for aiding and abetting these alleged breaches of fiduciary duties. Two of the complaints challenge the adequacy of the disclosures concerning the transaction in the registration statement on Form S-4 relating to the merger. The plaintiffs in these actions seek, among other things, preliminary and permanent injunctive relief prohibiting consummation of the merger, rescission or rescissory damages in the event the merger is consummated, damages, attorneys’ fees and costs, and other and further relief. Each of the defendants believes the claims asserted in these actions are without merit and intends to vigorously defend against this lawsuit. However, at this time, it is not possible to predict the outcome of the proceedings or their impact on the Company.
	There were no material changes or additions to other significant pending legal or other proceedings involving us other than those arising out of routine operations. Management does not anticipate that the ultimate liability, if any, arising out of such other proceedings will have a material effect on the Consolidated Financial Statements.

Subsequent_Events

Subsequent Events	3 Months Ended
	Mar. 31, 2015
Subsequent Events [Abstract]
Subsequent Events	16. SUBSEQUENT EVENTS
	On March 17, 2015 the Board of Directors declared a three-for-one stock split in our common stock in the form of a stock dividend of two shares for each issued and outstanding share of common stock. The stock dividend will be paid on or about May 18, 2015 to stockholders of record as of May 4, 2015.
	The pro forma effect on share amounts included in the unaudited Consolidated Statements of Condition are as follows:
		March 31,		December 31,
		2015		2014
	Shares authorized		65,000,000		65,000,000
	Shares issued		37,441,473		37,370,932
	Treasury stock		9,174,735		9,163,096
	The following shows the pro forma computation of basic and diluted earnings per share:
	(In Thousands, Except Per Share Data)	For the three months ended
		March 31,
		2015		2014
		(unaudited)
	Numerator:
	Net income	$	12,889	$	16,911
	Denominator:
	Weighted average basic share		28,218		26,712
	Dilutive potential common shares		534		672
	Weighted average fully dilutive shares		28,752		27,384
	Earnings per share:
	Basic	$	0.46	$	0.63
	Diluted	$	0.45	$	0.62
	Outstanding common stock equivalents having no dilutive effect		237		132

Basis_of_Presentation_Policies

Basis of Presentation (Policies)	3 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
Basis of Presentation	Our unaudited Consolidated Financial Statements include the accounts of WSFS Financial Corporation (the Company, our Company, we, our or us), Wilmington Savings Fund Society, FSB (WSFS Bank or the Bank) and Cypress Capital Management, LLC (Cypress). We also have one unconsolidated affiliate, WSFS Capital Trust III (the Trust). WSFS Bank has three wholly-owned subsidiaries, WSFS Wealth Investments, 1832 Holdings, Inc. and Monarch Entity Services LLC (Monarch).
	Founded in 1832, the Bank is the seventh oldest bank continuously operating under the same name in the United States. We provide residential and commercial real estate, commercial and consumer lending services, as well as retail deposit and cash management services. Lending activities are funded primarily with customer deposits and borrowings. In addition, we offer a variety of wealth management and trust services to personal and corporate customers through our Wealth Management division. The Federal Deposit Insurance Corporation (FDIC) insures our customers’ deposits to their legal maximums. We serve our customers primarily from our 56 offices located in Delaware (45), Pennsylvania (9), Virginia (1) and Nevada (1) and through our website at www.wsfsbank.com. Information on our website is not incorporated by reference into this quarterly report.
	Amounts subject to significant estimates are items such as the allowance for loan losses and reserves for lending related commitments, goodwill, intangible assets, post-retirement benefit obligations, the fair value of financial instruments, reverse mortgage related assets, income taxes and other-than-temporary impairments (OTTI). Among other effects, changes to such estimates could result in future impairments of investment securities, goodwill and intangible assets and establishment of allowances for loan losses and lending related commitments as well as increased post-retirement benefits expense.
	Our accounting and reporting policies conform to U.S. generally accepted accounting principles (GAAP), prevailing practices within the banking industry for interim financial information and Rule 10-01 of SEC Regulation S-X (Rule 10-01). Rule 10-01 does not require us to include all information and notes that would be required in audited financial statements. Operating results for the periods presented are not necessarily indicative of the results that may be expected for any future quarters or for the year ending December 31, 2015. These unaudited, interim Consolidated Financial Statements should be read in conjunction with the audited Consolidated Financial Statements and related notes included in our 2014 Annual Report on Form 10-K that was filed with the U.S. Securities and Exchange Commission (SEC) on March 16, 2015 and is available at www.sec.gov.
	Whenever necessary, reclassifications have been made to the prior period Consolidated Financial Statements to conform to the current period’s presentation. All significant intercompany transactions were eliminated in consolidation.
	The significant accounting policies used in preparation of our Consolidated Financial Statements are disclosed in our 2014 Annual Report on Form 10-K. There have not been any material changes in our significant accounting policies from those contained in our 2014 Annual Report on Form 10-K.
Accounting for Stock-Based Compensation	Accounting for Stock-Based Compensation
	Stock-based compensation is accounted for in accordance with FASB ASC 718, Stock Compensation. After stockholder approval in 2005, the 1997 Stock Option Plan (1997 Plan) was replaced by the 2005 Incentive Plan (2005 Plan). Upon stockholder approval in 2013, the 2005 Incentive Plan was amended and replaced by the 2013 Incentive Plan (2013 Plan). No future awards may be granted under the 2005 Plan; however, we still have options outstanding the 2005 Plan for officers, directors and employees of us and our subsidiaries (Associates). The 2013 Plan will terminate on the tenth anniversary of its effective date, after which no further awards may be granted under such plan. Collectively, the 1997 Plan, 2005 Plan and 2013 Plan are referred to as Stock Incentive Plans. The number of shares reserved for issuance under the 2013 Plan is 698,845. At March 31, 2015, there were 298,439 shares available for future grants under the 2013 Plan.
	With the exception of certain performance stock awards, the Stock Incentive Plans provide for the granting of incentive stock options as defined in Section 422 of the Internal Revenue Code as well as non-incentive stock options (collectively, stock options). Additionally, the 2013 Plan provides for the granting of stock appreciation rights, performance awards, restricted stock and restricted stock unit awards, deferred stock units, dividend equivalents, other stock-based awards and cash awards. All stock options are to be granted at not less than the market price of our common stock on the date of the grant. With the exception of certain non-plan stock options, all stock options granted during 2015, 2014 and 2013 vest in 25% per annum increments, start to become exercisable one year from the grant date and expire between five and seven years from the grant date. Generally, all awards become exercisable immediately in the event of a change in control, as defined within the Stock Incentive Plans. In addition, the Black-Scholes option-pricing model is used to determine the grant date fair value of stock options.
	Stock Options
	The following table provides information about our stock options outstanding for the three months ended March 31, 2015 and 2014:
		March 31, 2015					March 31, 2014
					Weighted-					Weighted-
					Average					Average
		Shares			Exercise		Shares			Exercise
					Price					Price
	Stock Options:
	Outstanding at beginning of period		661,345		$	49.15		712,578		$	47.42
	Granted		24,576			78.71		43,686			71.47
	Exercised		(25,239	)		45.55		(20,366	)		33.8
	Outstanding at end of period		660,682			50.39		735,898			49.23
	Exercisable at end of period		276,412		$	48.18		137,005		$	47.08
	Weighted-average fair value of awards granted	$	17.2				$	17.35
	The following table provides vesting information about our stock options outstanding for the three months ended March 31, 2015 and 2014:
		March 31, 2015					March 31, 2014
					Weighted-					Weighted-
					Average					Average
		Shares			Exercise		Shares			Exercise
					Price					Price
	Stock Options:
	Unvested at beginning of period		576,381		$	50.01		609,029		$	47.66
	Granted		24,576			78.71		43,686			71.47
	Vested		(216,687	)		49.79		(53,822	)		44.11
	Unvested at end of period		384,270		$	51.97		598,893		$	49.72
	The total amount of compensation cost to be recognized relating to non-vested stock options as of March 31, 2015 was $4.8 million. The weighted-average period over which it is expected to be recognized is 2.8 years. We issue new shares upon the exercise of options.
	Restricted Stock
	We issued 12,714 restricted stock units during the first quarter of 2015. These awards vest over a four year period. The total amount of compensation cost to be recognized relating to non-vested restricted stock as of March 31, 2015, was $1.8 million. The weighted-average period over which it is expected to be recognized is 3.1 years.
	Performance Stock Awards
	The Long-Term Performance-Based Stock Unit program (Long-Term Program) provided for awards up to an aggregate of 77,800 shares of our stock to the remaining 14 participants, only after the achievement of targeted levels of return on assets (ROA) in any year through 2014. During 2014, the company achieved the 1.00% ROA performance level and in accordance with the Long-Term Program, we issued 36,152 restricted stock units to the plan’s participants. The awarded restricted stock units will vest in 25% increments over four years. During the first quarter of 2015, we recognized $102,000 of compensation expense related to this program. Compensation expense related to the Long-Term Program was based on the closing stock price as of May 28, 2008.
	The Board approved a plan in which Marvin N. Schoenhals, Chairman of the Board, was granted 22,250 shares of restricted stock effective January 3, 2011, with a five-year performance vesting schedule starting at the end of the second year. These awards are based on acquiring new business relationships that Mr. Schoenhals played a meaningful role in helping us establish. These shares are subject to vesting in whole or in part based on the role Mr. Schoenhals played in establishing new business relationships that, over a two year period of time, achieve at least a 50% return on the investment of restricted stock cost. We recognized compensation expense of $64,000 related to this award during the first quarter of 2015 compared to $69,000 during the first quarter of 2014. During the first quarter of 2015, 5,563 shares of restricted stock vested based on Mr. Schoenhals performance during 2014.
	For the three months ended March 31, 2015, the effect of stock-based compensation, including stock options, restricted stock, and performance stock, on salaries, benefits and other compensation was $842,000 pre-tax ($593,000 after tax), or $0.06 per share. This compares to $802,000 pre-tax ($577,000 after tax), or $0.06 per share during the three months ended March 31, 2014.
Recent Accounting Pronouncements	RECENT ACCOUNTING PRONOUNCEMENTS
	Accounting Standards Updates adopted in 2015
	In June 2014, the FASB issued ASU No. 2014-11, “Repurchase-to-Maturity Transactions, Repurchase Financings, and Disclosures.” The new guidance aligns the accounting for repurchase-to-maturity transactions and repurchase agreements executed as repurchase financings with the accounting for other typical repurchase agreements. Going forward, these transactions would all be accounted for as secured borrowings. The guidance eliminates sale accounting for repurchase-to-maturity transactions and supersedes the guidance under which a transfer of a financial asset and a contemporaneous repurchase financing could be accounted for on a combined basis as a forward agreement, which has resulted in outcomes referred to as off-balance-sheet accounting. The amendments in the ASU require a new disclosure for transactions economically similar to repurchase agreements in which the transferor retains substantially all of the exposure to the economic return on the transferred financial assets throughout the term of the transaction. The amendments in the ASU also require expanded disclosures about the nature of collateral pledged in repurchase agreements and similar transactions accounted for as secured borrowings. The amendments in this ASU are effective for public companies for the first interim or annual period beginning after December 15, 2014. In addition, for public companies, the disclosure for certain transactions accounted for as a sale is effective for the first interim or annual reporting periods beginning on or after December 15, 2014, and the disclosure for transactions accounted for as secured borrowings is required to be presented for annual reporting periods beginning after December 15, 2014, and interim periods beginning after March 15, 2015. The adoption of this accounting guidance does not have a material effect on the Company’s financial condition or results of operations.
	In January 2014, the Financial Accounting Standards Board (FASB), issued Accounting Standards Update (ASU) No. 2014-01, Investments - Equity Method and Joint Ventures (Topic 323) - Accounting for Investments in Qualified Affordable Housing Projects (a consensus of the FASB Emerging Issues Task Force). This ASU permits an entity to make an accounting policy election to account for its investment in qualified affordable housing projects using the proportional amortization method if certain conditions are met. Under the proportionate amortization method, an entity amortizes the initial cost of the investment in proportion to the tax credits and other tax benefits received and recognizes the net investment performance in the income statement as a component of income tax expense (benefit). A reporting entity that uses the effective yield or other method to account for its investments in qualified affordable housing projects before the date of adoption may continue to apply such method to those preexisting investments. We adopted this accounting guidance effective January 1, 2015. The adoption does not have a material effect on the Company’s financial condition or results of operations. For additional discussion on the adoption of this guidance refer to the Income Taxes section of Management’s Discussion and Analysis of Financial Condition and Results of Operations.
	In January 2014, the FASB issued ASU No. 2014-04, Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure (ASU 2014-04). The objective of this guidance is to clarify when an in substance repossession or foreclosure occurs, that is, when a creditor should be considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan such that the loan receivable should be derecognized and the real estate property recognized. ASU No. 2014-04 states that an in substance repossession or foreclosure occurs, and a creditor is considered to have received physical possession of residential real estate property collateralizing a consumer mortgage loan, upon either (1) the creditor obtaining legal title to the residential real estate property upon completion of a foreclosure or (2) the borrower conveying all interest in the residential real estate property to the creditor to satisfy that loan through completion of a deed in lieu of foreclosure or through a similar legal agreement. Additionally, ASU No. 2014-04 requires interim and annual disclosure of both (1) the amount of foreclosed residential real estate property held by the creditor and (2) the recorded investment in consumer mortgage loans collateralized by residential real estate property that are in the process of foreclosure according to local requirements of the applicable jurisdiction. The adoption of this accounting guidance does not have a material effect on the Company’s financial condition or results of operations.
	In August 2014, the FASB issued ASU No. 2014-14, Receivables-Troubled Debt Restructurings by Creditors (Subtopic 310-40): Classification of Certain Government-Guaranteed Mortgage Loans upon Foreclosure (a consensus of the FASB Emerging Issues Task Force). The objective of this guidance is to reduce diversity in practice related to how creditors classify government-guaranteed mortgage loans, including FHA or VA guaranteed loans, upon foreclosure. Some creditors reclassify those loans to real estate consistent with other foreclosed loans that do not have guarantees; others reclassify the loans to other receivables. The amendments in this guidance require that a mortgage loan be derecognized and that a separate other receivable be recognized upon foreclosure if the following conditions are met: (1) the loan has a government guarantee that is not separable from the loan before foreclosure; (2) at the time of foreclosure, the creditor has the intent to convey the real estate property to the guarantor and make a claim on the guarantee, and the creditor has the ability to recover under that claim; and (3) at the time of foreclosure, any amount of the claim that is determined on the basis of the fair value of the real estate is fixed. Upon foreclosure, the separate other receivable should be measured based on the amount of the loan balance (principal and interest) expected to be recovered from the guarantor. The adoption of this accounting guidance does not have a material effect on the Company’s financial condition or results of operations.
	Accounting Standards Updates Not Yet Adopted
	In May 2014, the FASB issued ASU No. 2014-9, Revenue from Contracts with Customers (Topic 606). This ASU supersedes the revenue recognition requirements in Accounting Standards Codification (ASC) 605, Revenue Recognition. ASU No. 2014-9 will require an entity to recognize revenue when it transfers promised goods or services to customers using a five-step model that requires entities to exercise judgment when considering the terms of the contracts. This ASU is effective for us beginning April 1, 2017 and can be adopted either retrospectively to each prior reporting period presented or as a cumulative-effect adjustment as of the date of adoption. The Company does not expect the application of this guidance to have a material impact on the Company’s financial statements.
	In February 2015, the FASB issued ASU No 2015-02, Consolidation (Topic 810): Amendments to the Consolidation Analysis. This guidance provides an additional requirement for a limited partnership or similar entity to qualify as a voting interest entity and also amends the criteria for consolidating such an entity. In addition, it amends the criteria for evaluating fees paid to a decision maker or service provider as a variable interest and amends the criteria for evaluating the effect of fee arrangements and related parties on a VIE primary beneficiary determination. This guidance is effective for interim and annual reporting periods beginning after December 15, 2015
	In April 2015, the FASB issued ASU No 2015-03, Interest- Imputation of Interest (Subtopic 835-30) Simplifying the Presentation of Debt Issuance Costs. The amendments in this update require that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of that debt liability, consistent with debt discounts. The recognition and measurement guidance for debt issuance costs are not affected by this amendment. This guidance is effective for interim and annual reporting periods beginning after December 15, 2015. The Company does not expect the application of this guidance to have a material impact on the Company’s financial statements.

Basis_of_Presentation_Tables

Basis of Presentation (Tables)	3 Months Ended
	Mar. 31, 2015
Accounting Policies [Abstract]
Summary of Stock Options Outstanding	The following table provides information about our stock options outstanding for the three months ended March 31, 2015 and 2014:
		March 31, 2015					March 31, 2014
					Weighted-					Weighted-
					Average					Average
		Shares			Exercise		Shares			Exercise
					Price					Price
	Stock Options:
	Outstanding at beginning of period		661,345		$	49.15		712,578		$	47.42
	Granted		24,576			78.71		43,686			71.47
	Exercised		(25,239	)		45.55		(20,366	)		33.8
	Outstanding at end of period		660,682			50.39		735,898			49.23
	Exercisable at end of period		276,412		$	48.18		137,005		$	47.08
	Weighted-average fair value of awards granted	$	17.2				$	17.35
Summary of Vesting Information about Stock Options Outstanding	The following table provides vesting information about our stock options outstanding for the three months ended March 31, 2015 and 2014:
		March 31, 2015					March 31, 2014
					Weighted-					Weighted-
					Average					Average
		Shares			Exercise		Shares			Exercise
					Price					Price
	Stock Options:
	Unvested at beginning of period		576,381		$	50.01		609,029		$	47.66
	Granted		24,576			78.71		43,686			71.47
	Vested		(216,687	)		49.79		(53,822	)		44.11
	Unvested at end of period		384,270		$	51.97		598,893		$	49.72

Business_Combinations_Tables

Business Combinations (Tables)	3 Months Ended
	Mar. 31, 2015
Summary of Consideration Paid and Fair Value of Identifiable Assets Acquired and Liabilities Assumed	In connection with the merger, the consideration paid and the fair value of identifiable assets acquired and liabilities assumed, as of the date of acquisition, are summarized in the following table:
	(In Thousands)	Fair Value
	Consideration Paid:
	Common shares issued (452,661)	$	32,908
	Cash paid to FNBW stockholders		32,028
	Value of consideration		64,936
	Assets acquired:
	Cash and due from banks		40,605
	Investment securities		41,822
	Loans		175,894
	Premises and equipment		1,644
	Deferred income taxes		3,139
	Bank owned life insurance		12,576
	Core deposit intangible		3,240
	Other Real Estate Owned		1,593
	Other assets		4,766
	Total assets		285,279
	Liabilities assumed:
	Deposits		228,844
	FHLB advances		5,052
	Other liabilities		2,990
	Total liabilities		236,886
	Net assets acquired:		48,393
	Goodwill resulting from acquisition of FNBW:	$	16,543
First Wyoming Financial Corporation [Member]
Schedule of Changes to Goodwill	The following table details the changes to goodwill:
	(In Thousands)	Fair Value
	Goodwill resulting from the acquisition of FNBW reported as of December 31, 2014	$	16,370
	Effects of adjustments to:
	Assets		173
	Liabilities		—
	Final purchase price		—
	Adjusted goodwill resulting from the acquisition of FNBW as of March 31, 2015	$	16,543

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 2015
Earnings Per Share [Abstract]
Earnings Per Share	The following table shows the computation of basic and diluted earnings per share:
		For the three months ended
		March 31,
	(In Thousands, Except Per Share Data)	2015		2014
	Numerator:
	Net income	$	12,889	$	16,911
	Denominator:
	Weighted average basic shares		9,406		8,904
	Dilutive potential common shares		178		224
	Weighted average fully diluted shares		9,584		9,128
	Earnings per share:
	Basic	$	1.37	$	1.9
	Diluted	$	1.34	$	1.85
	Outstanding common stock equivalents having no dilutive effect		79		44

Investment_Securities_Tables

Investment Securities (Tables)	3 Months Ended
	Mar. 31, 2015
Investments, Debt and Equity Securities [Abstract]
Schedule of Amortized Cost and Estimated Fair Value of Available-for-Sale and Held-to-Maturity Investment Securities	The following tables detail the amortized cost and the estimated fair value of our investment securities classified as available-for-sale and held-to-maturity. None of our investment securities are classified as trading.
				Gross		Gross
		Amortized		Unrealized		Unrealized			Fair
	(In Thousands)	Cost		Gain		Loss			Value
	Available-for-Sale Securities:
	March 31, 2015
	U.S. Government and government sponsored enterprises (GSE)	$	35,030	$	51	$	12		$	35,069
	Collateralized Mortgage Obligations (CMO)		219,054		2,491		524			221,021
	Federal National Mortgage Association (FNMA) MBS		300,690		3,627		190			304,127
	Federal Home Loan Mortgage Corporation (FHLMC) MBS		149,799		1,337		122			151,014
	Government National Mortgage Association (GNMA) MBS		74,293		1,022		49			75,266
		$	778,866	$	8,528	$	897		$	786,497
	(In Thousands)
	Available-for-Sale Securities:
	December 31, 2014
	GSE	$	30,020	$	14	$	74		$	29,960
	CMO		193,672		874		1,614			192,932
	FNMA MBS		291,606		2,053		1,106			292,553
	FHLMC MBS		146,742		672		532			146,882
	GNMA MBS		77,364		701		268			77,797
		$	739,404	$	4,314	$	3,594		$	740,124
				Gross		Gross
		Amortized		Unrealized		Unrealized			Fair
	(In Thousands)	Cost		Gain		Loss			Value
	Held-to-Maturity Securities
	March 31, 2015
	State and political subdivisions	$	122,887	$	422	$	538		$	122,771
	December 31, 2014
	State and political subdivisions	$	126,168	$	3	$	—		$	126,171
Schedule of Amortized Cost of Held-to-Maturity Investments	At March 31, 2015, the amortized cost of held-to-maturity investments consisted of the following:
		Original		Unrealized					Amortized
				Gain
	(In Thousands)	Cost		at Transfer		Accretion			Cost
	Transferred securities	$	118,204	$	3,559	$	(171	)	$	121,592
	Other held-to-maturity securities		1,295		—		—			1,295
	Total	$	119,499	$	3,559	$	(171	)	$	122,887
Schedule of Maturities of Investment Securities Available-for-Sale and Held-to-Maturity	The scheduled maturities of investment securities available-for-sale and held-to-maturity at March 31, 2015 and December 31, 2014 are presented in the table below:
		Available-for-Sale
	(In Thousands)	Amortized		Fair
	March 31, 2015	Cost		Value
	Within one year	$	10,000	$	10,008
	After one year but within five years		28,045		28,071
	After five years but within ten years		146,878		148,062
	After ten years		593,943		600,356
		$	778,866	$	786,497
	December 31, 2014
	Within one year	$	10,000	$	10,014
	After one year but within five years		20,020		19,946
	After five years but within ten years		134,453		133,395
	After ten years		574,931		576,769
		$	739,404	$	740,124
		Held-to-Maturity
	(In Thousands)	Amortized		Fair
	March 31, 2015	Cost		Value
	Within one year	$	3,761	$	3,764
	After one year but within five years		3,636		3,642
	After five years but within ten years		9,310		9,405
	After ten years		106,180		105,960
		$	122,887	$	122,771
	December 31, 2014
	Within one year	$	3,608	$	3,608
	After one year but within five years		6,217		6,217
	After five years but within ten years		9,733		9,736
	After ten years		106,610		106,610
		$	126,168	$	126,171
Schedule of Investment Securities' Gross Unrealized Losses and Fair Value by Investment Category	For these investment securities with unrealized losses, the table below shows our gross unrealized losses and fair value by investment category and length of time that individual securities were in a continuous unrealized loss position at March 31, 2015 and December 31, 2014:
		Duration of Unrealized Loss Position
		Less than 12 months				12 months or longer					Total
	(In Thousands)	Fair		Unrealized		Fair			Unrealized		Fair		Unrealized
	March 31, 2015	Value		Loss		Value			Loss		Value		Loss
	GSE	$	8,010	$	12	$	—		$	—	$	8,010	$	12
	CMO		23,240		71		29,601			453		52,841		524
	FNMA MBS		48,218		190		—			—		48,218		190
	FHLMC MBS		22,756		36		4,373			86		27,129		122
	GNMA MBS		—		—		2,632			49		2,632		49
	State and political subdivisions		67,608		538		—			—		67,608		538
	Total temporarily impaired investments	$	169,832	$	847	$	36,606		$	588	$	206,438	$	1,435
	December 31, 2014
	GSE	$	19,945	$	74	$	—		$	—	$	19,945	$	74
	CMO		15,492		108		61,630			1,506		77,122		1,614
	FNMA MBS		—		—		103,207			1,106		103,207		1,106
	FHLMC MBS		23,901		54		58,267			478		82,168		532
	GNMA MBS		—		—		48,312			268		48,312		268
	Total temporarily impaired investments	$	59,338	$	236	$	271,416		$	3,358	$	330,754	$	3,594

Loans_Tables

Loans (Tables)	3 Months Ended
	Mar. 31, 2015
Summary of Loan Portfolio by Category	The following details our loan portfolio by category:
		March 31,			December 31
	(In Thousands)	2015			2014
	Commercial	$	923,070		$	920,072
	Owner occupied commercial		797,400			788,598
	Commercial mortgages		820,836			805,459
	Construction		153,224			142,497
	Residential		216,197			218,329
	Consumer		324,232			327,543
		$	3,234,959		$	3,202,498
	Less:
	Deferred fees, net	$	6,314		$	6,420
	Allowance for loan losses		39,507			39,426
	Net loans	$	3,189,138		$	3,156,652
Schedule of Outstanding Principal Balance and Carrying Amounts for Acquired Credit-Impaired Loans	The following is the outstanding principal balance and carrying amounts for acquired credit impaired loans for which the company applies ASC 310-30 as of March 31, 2015.
	(In Thousands)
	Outstanding principal balance	$	21,925
	Carrying amount	$	15,336
	Allowance for Loan loss		N/A
Summary of Changes in Accretable Yield on Acquired Credit Impaired Loans	The following table presents the changes in accretable yield on the acquired credit impaired loans from January 1, 2015 to March 31, 2015.
	(In Thousands)
	Balance at beginning of period	$	1,498
	Accretion		(179	)
	Additions/adjustments		(3	)
	Balance at the end of the period	$	1,316
First Wyoming Financial Corporation [Member]
Schedule of Loans Acquired Through Merger in Accordance with FASB ASC 310-30	The following table details the loans acquired through the FNBW merger on September 5, 2014 that are accounted for in accordance with FASB ASC 310-30, Loans and Debt Securities Acquired with Deteriorated Credit Quality (ASC 310-30).
	(In Thousands)
	Contractually required principal and interest at acquisition	$	27,086
	Contractual cash flows not expected to be collected (nonaccretable difference)		7,956
	Expected cash flows at acquisition		19,130
	Interest component of expected cash flows (accretable yield)		1,790
	Fair value of acquired loans accounted for under FASB ASC 310-30	$	17,340

Allowance_for_Loan_Losses_and_1

Allowance for Loan Losses and Credit Quality Information (Tables)	3 Months Ended
	Mar. 31, 2015
Text Block [Abstract]
Schedule of Allowance for Loan Losses and Loan Balances	The following tables provide the activity of our allowance for loan losses and loan balances for three months ended March 31, 2015 and 2014:
						Owner-			Commercial												Complexity
						Occupied			Mortgages												Risk (1)
	(In Thousands)		Commercial			Commercial						Construction			Residential			Consumer						Total
	Three months ended March 31, 2015
	Allowance for loan losses
	Beginning balance		$	12,837		$	6,643		$	7,266		$	2,596		$	2,523		$	6,041		$	1,520		$	39,426
	Charge-offs			(131	)		(330	)		(39	)		—			(125	)		(450	)		—			(1,075	)
	Recoveries			26			4			79			49			11			201			—			370
	Provision (credit)			316			722			(782	)		307			(29	)		234			18			786
	Ending balance		$	13,048		$	7,039		$	6,524		$	2,952		$	2,380		$	6,026		$	1,538		$	39,507
	Period-end allowance allocated to:
	Loans individually evaluated for impairment		$	3,169		$	284		$	223		$	210		$	751		$	197		$	—		$	4,834
	Loans collectively evaluated for impairment			9,879			6,755			6,301			2,742			1,629			5,829			1,538			34,673
	Ending balance		$	13,048		$	7,039		$	6,524		$	2,952		$	2,380		$	6,026		$	1,538		$	39,507
	Period-end loan balances evaluated for:
	Loans individually evaluated for impairment		$	11,707		$	1,552		$	7,595		$	1,419		$	14,749		$	6,157		$	—		$	43,179	(2)
	Loans collectively evaluated for impairment			876,434			754,044			770,991			138,495			184,337			310,427			—			3,034,728
	Acquired nonimpaired loans			31,737			39,671			36,373			9,680			16,615			7,640			—			141,716
	Acquired impaired loans			3,192			2,133			5,877			3,630			496			8			—			15,336
	Ending balance		$	923,070		$	797,400		$	820,836		$	153,224		$	216,197		$	324,232		$	—		$	3,234,959	(3)
						Owner-			Commercial												Complexity
						Occupied			Mortgages												Risk (1)
	(In Thousands)		Commercial			Commercial						Construction			Residential			Consumer						Total
	Three months ended March 31, 2014
	Allowance for loan losses
	Beginning balance		$	12,751		$	7,638		$	6,932		$	3,326		$	3,078		$	6,494		$	1,025		$	41,244
	Charge-offs			(1,113	)		(197	)		(160	)		(88	)		(364	)		(1,233	)		—			(3,155	)
	Recoveries			324			6			37			7			18			217			—			609
	Provision (credit)			442			1,342			554			(529	)		33			771			17			2,630
	Ending balance		$	12,404		$	8,789		$	7,363		$	2,716		$	2,765		$	6,249		$	1,042		$	41,328
	Period-end allowance allocated to:
	Loans individually evaluated for impairment		$	1,865		$	1,191		$	1,019		$	—		$	807		$	186			—		$	5,068
	Loans collectively evaluated for impairment			10,539			7,598			6,344			2,716			1,958			6,063			1,042			36,260
	Ending balance		$	12,404		$	8,789		$	7,363		$	2,716		$	2,765		$	6,249		$	1,042		$	41,328
	Period-end loan balances evaluated for:
	Loans individually evaluated for impairment		$	4,583		$	6,318			15,786		$	1,070			18,413		$	5,537			—		$	51,707	(2)
	Loans collectively evaluated for impairment			833,598			792,895			730,543			100,415			199,740			295,774			—			2,952,965
	Ending balance		$	838,181		$	799,213		$	746,329		$	101,485		$	218,153		$	301,311		$	—		$	3,004,672	(3)
	-1	Represents the portion of the allowance for loan losses established to account for the inherent complexity and uncertainty of estimates.
	-2	The difference between this amount and nonaccruing loans represents accruing troubled debt restructured loans of $ 22.5 million and $11.6 million for the periods ending March 31, 2015 and March 31, 2014, respectively. Accruing troubled debt restructured loans are considered impaired loans.
	-3	Ending loan balances do not include deferred costs.
Summary of Nonaccrual and Past Due Loans	The following tables show our nonaccrual and past due loans at the dates indicated:
	March 31, 2015		30–59 Days			60–89 Days			Greater Than			Total Past			Accruing			Acquired			Nonaccrual			Total
	(In Thousands)		Past Due and			Past Due and			90 Days			Due			Current			Impaired			Loans			Loans
			Still Accruing			Still Accruing			Past Due and			And Still			Balances			Loans
									Still Accruing			Accruing
	Commercial		$	3,085		$	9		$	—		$	3,094		$	914,677		$	3,192		$	2,107		$	923,070
	Owner-Occupied commercial			1,362			—			—			1,362			792,353			2,133			1,552			797,400
	Commercial mortgages			—			—			100			100			807,351			5,877			7,508			820,836
	Construction			—			—			—			—			149,594			3,630			—			153,224
	Residential			3,618			674			492			4,784			204,690			496			6,227			216,197
	Consumer			739			191			102			1,032			319,905			8			3,287			324,232
	Total (1)		$	8,804		$	874		$	694		$	10,372		$	3,188,570		$	15,336		$	20,681		$	3,234,959
	% of Total Loans			0.27	%		0.03	%		0.02	%		0.32	%		98.57	%		0.47	%		0.64	%		100	%
	-1	The balances of above include $141.7 million of acquired nonimpaired loans.
	December 31, 2014		30–59 Days			60–89 Days			Greater Than			Total			Accruing			Acquired			Nonaccrual			Total
	(In Thousands)		Past Due and			Past Due and			90 Days			Past			Current			Impaired			Loans			Loans
			Still Accruing			Still Accruing			Past Due and			Due			Balances			Loans
									Still Accruing			And Still
												Accruing
	Commercial		$	715		$	—		$	—		$	715		$	913,382		$	3,269		$	2,706		$	920,072
	Owner-Occupied commercial			393			—			—			393			783,466			2,264			2,475			788,598
	Commercial mortgages			203			—			—			203			791,035			5,976			8,245			805,459
	Construction			—			—			—			—			138,634			3,863			—			142,497
	Residential			3,879			604			—			4,483			206,266			512			7,068			218,329
	Consumer			1,241			342			4			1,587			322,390			9			3,557			327,543
	Total (1)		$	6,431		$	946		$	4		$	7,381		$	3,155,173		$	15,893		$	24,051		$	3,202,498
	% of Total Loans			0.20	%		0.03	%		—	%		0.23	%		98.52	%		0.50	%		0.75	%		100	%
	-1	The balances of above include $145.8 million of acquired nonimpaired loans
Analysis of Impaired Loans	The following tables provide an analysis of our impaired loans at March 31, 2015 and December 31, 2014:
	March 31, 2015		Ending			Loans with			Loans with			Related			Contractual			Average
	(In Thousands)		Loan			No Related			Related			Reserve			Principal			Loan
			Balances			Reserve (1)			Reserve						Balances			Balances
	Commercial		$	11,707		$	592		$	11,115		$	3,169		$	12,491		$	7,293
	Owner-occupied commercial			1,552			1,268			284			284			2,625			3,732
	Commercial mortgages			7,595			4,167			3,428			223			10,516			10,792
	Construction			1,419			—			1,419			210			1,419			1,065
	Residential			14,749			7,987			6,762			751			16,815			16,676
	Consumer			6,157			4,875			1,282			197			6,768			6,051
	Total		$	43,179		$	18,889		$	24,290		$	4,834		$	50,634		$	45,609
	December 31, 2014		Ending			Loans with			Loans with			Related			Contractual			Average
	(In Thousands)		Loan			No Related			Related			Reserve			Principal			Loan
			Balances			Reserve (1)			Reserve						Balances			Balances
	Commercial		$	12,381		$	580		$	11,801		$	3,034		$	20,924		$	5,952
	Owner-occupied commercial			2,474			1,865			609			609			3,708			4,461
	Commercial mortgages			8,335			4,732			3,603			319			14,383			11,005
	Construction			1,419			—			1,419			334			1,419			1,013
	Residential			15,666			7,068			8,598			790			18,967			17,296
	Consumer			6,376			3,557			2,819			231			7,162			5,902
	Total		$	46,651		$	17,802		$	28,849		$	5,317		$	66,563		$	45,629
	-1	Reflects loan balances at or written down to their remaining book balance.
Schedule of Commercial Credit Exposure	Commercial Credit Exposure
									Owner-Occupied						Commercial												Total
	(In Thousands)		Commercial						Commercial						Mortgages						Construction						Commercial(1)
																											March 31,					December 31,
			Mar. 31			Dec. 31			Mar. 31			Dec. 31			Mar. 31			Dec. 31			Mar. 31			Dec. 31			2015					2014
			2015			2014			2015			2014			2015			2014			2015			2014			Amount		%			Amount		%
	Risk Rating:
	Special mention		$	6,085		$	4,744		$	18,858		$	6,989		$	9,048		$	9,065		$	—		$	—		$	33,991				$	20,798
	Substandard:
	Accrual			49,520			42,377			15,677			14,436			4,527			9,167			1,304			1,085			71,028					67,065
	Nonaccrual			811			1,225			1,268			1,865			7,284			7,927									9,363					11,017
	Doubtful/nonaccrual			3,169			3,034			284			609			223			319			210			334			3,886					4,296
	Total Special and Substandard			59,585			51,380			36,087			23,899			21,082			26,478			1,514			1,419			118,268		4	%		103,176		4	%
	Acquired impaired			3,192			3,269			2,133			2,264			5,877			5,976			3,630			3,863			14,832		1			15,372		—
	Pass			860,293			865,423			759,180			762,435			793,877			773,005			148,080			137,215			2,561,430		95			2,538,078		96
	Total		$	923,070		$	920,072		$	797,400		$	788,598		$	820,836		$	805,459		$	153,224		$	142,497		$	2,694,530		100	%	$	2,656,626		100	%
	-1	Table includes $117.5 million and $119.8 million of acquired nonimpaired loans as of March 31, 2015 and December 31, 2014, respectively.
Schedule of Consumer Credit Exposure	Consumer Credit Exposure
	(In Thousands)		Residential						Consumer						Total Residential and Consumer(2)
			Mar 31.			Dec. 31			Mar 31.			Dec. 31			March 31, 2015						December 31, 2014
			2015			2014			2015			2014			Amount			Percent			Amount			Percent
	Nonperforming(1)		$	14,749		$	15,666		$	6,157		$	6,376		$	20,906			4	%	$	22,042			4	%
	Acquired impaired Loans			496			512			8			9			504						521
	Performing			200,952			202,151			318,067			321,158			519,019			96			523,309			96
	Total		$	216,197		$	218,329		$	324,232		$	327,543		$	540,429			100	%	$	545,872			100	%
	-1	Includes $11.4 million as of March 31, 2015 and $11.4 million as of December 31, 2014 of troubled debt restructured mortgages and home equity installment loans that are performing in accordance with the loans’ modified terms and are accruing interest.
	-2	Total includes $24.3 million and $26.0 million in acquired nonimpaired loans as of March 31, 2015 and December 31, 2014, respectively.
Schedule of Loans Identified as Troubled Debt Restructurings During Periods Indicated	The following table presents loans identified as TDRs during the three months ended March 31, 2015 and 2014:
			Three			Three
			Months Ended			Months Ended
			March 31,			March 31,
	(In Thousands)		2015			2014
	Commercial		$	—		$	—
	Commercial mortgages			—			—
	Construction			—			—
	Residential			212			279
	Consumer			135			363
	Total		$	347		$	642

Reverse_Mortgage_Loans_Tables

Reverse Mortgage Loans (Tables)	3 Months Ended
	Mar. 31, 2015
Mortgage Banking [Abstract]
Summary of Estimated Cash Payments to Reverse Mortgagors	As of March 31, 2015, the Company’s actuarially estimated cash payments to reverse mortgagors are as follows:
	(in thousands)
	Year Ending
	Remaining in 2015		$	515
	2016			548
	2017			438
	2018			344
	2019			269
	Years 2020 - 2024			633
	Years 2025 - 2029			130
	Years 2030 - 2034			20
	Thereafter			2
	Total (1)		$	2,899
	-1	This table does not take into consideration cash inflow including payments from mortgagors or payoffs based on contractual terms.

Goodwill_and_Intangibles_Table

Goodwill and Intangibles (Tables)	3 Months Ended
	Mar. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of Allocation of Goodwill to Our Reportable Operating Segments for Purposes of Goodwill Impairment Testing	The following table shows the allocation of goodwill to our reportable operating segments for purposes of goodwill impairment testing:
							Trust &
		WSFS		Cash			Wealth		Consolidated
	(In Thousands)	Bank		Connect			Management		Company
	December 31, 2014	$	43,517	$	—		$	5,134	$	48,651
	Changes in goodwill		173		—			—		173
	31-Mar-15	$	43,690	$	—		$	5,134	$	48,824
Summary of Intangible Assets	The following table summarizes intangible assets:
		Gross					Net
	(In Thousands)	Intangible		Accumulated			Intangible
	March 31, 2015	Assets		Amortization			Assets
	Core deposits	$	7,610	$	(3,578	)	$	4,032
	CB&T intangibles		3,142		(1,035	)		2,107
	Array and Arrow intangibles		2,353		(584	)		1,769
	Mortgage servicing rights		1,478		(841	)		637
	Total intangible assets	$	14,583	$	(6,038	)	$	8,545
	December 31, 2014
	Core deposits	$	7,610	$	(3,321	)	$	4,289
	CB&T intangibles		3,142		(985	)		2,157
	Array and Arrow intangibles		2,353		(497	)		1,856
	Mortgage servicing rights		1,455		(815	)		640
	Total intangible assets	$	14,560	$	(5,618	)	$	8,942
Schedule of Estimated Amortization Expense of Intangibles	The following presents the estimated amortization expense of intangibles:
	(In Thousands)	Amortization
		of Intangibles
	Remaining in 2015	$	1,074
	2016		1,238
	2017		1,091
	2018		1,072
	2019		1,055
	Thereafter		3,015
	Total	$	8,545

Associate_Employee_Benefit_Pla1

Associate (Employee) Benefit Plans (Tables)	3 Months Ended
	Mar. 31, 2015
Compensation and Retirement Disclosure [Abstract]
Schedule of Net Periodic Benefit Cost Components of Postretirement Benefits	The following disclosures of the net periodic benefit cost components of postretirement benefits were measured at January 1, 2015 and 2014:
		Three months ended
		March 31,
	(In Thousands)	2015			2014
	Service cost	$	15		$	88
	Interest cost		22			56
	Prior service cost amortization		(19	)		—
	Net (gain) loss recognition		(5	)		14
	Net periodic benefit cost	$	13		$	158

Fair_Value_Disclosures_of_Fina1

Fair Value Disclosures of Financial Assets and Liabilities (Tables)	3 Months Ended
	Mar. 31, 2015
Fair Value Disclosures [Abstract]
Balances of Assets Measured at Fair Value	A description of the valuation methodologies used for instruments measured at fair value, as well as the general classification of such instruments pursuant to the valuation hierarchy as of March 31, 2015, is set forth in the following table:
		Quoted				Significant				Significant				Total Fair
		Prices in				Other				Unobservable
		Active				Observable				Inputs
		Markets for				Inputs
		Identical
	(In Thousands)	Asset
	Description	(Level 1)				(Level 2)				(Level 3)				Value
	Assets measured at fair value on a recurring basis
	Collateralized mortgage obligations	$	—			$	221,021			$	—			$	221,021
	FNMA		—				304,127				—				304,127
	FHLMC		—				151,014				—				151,014
	GNMA		—				75,266				—				75,266
	U.S. Government and agencies		—				35,069				—				35,069
	Total assets measured at fair value on a recurring basis	$	—			$	786,497			$	—			$	786,497
	Assets measured at fair value on a nonrecurring basis
	Other real estate owned	$	—			$	—			$	6,088			$	6,088
	Loans held-for-sale		—				46,892				—				46,892
	Impaired loans (collateral dependent)		—				—				38,795				38,795
	Total assets measured at fair value on a nonrecurring basis	$	—			$	46,892			$	44,883			$	91,775
	The table below presents the balances of assets measured at fair value as of December 31, 2014:
		Quoted				Significant				Significant				Total
		Prices in				Other				Unobservable
		Active				Observable				Inputs
		Markets for				Inputs
		Identical
	(In Thousands)	Asset
	Description	(Level 1)				(Level 2)				(Level 3)				Fair Value
	Assets measured at fair value on a recurring basis
	Available-for-sale securities:
	Collateralized mortgage obligations	$	—			$	192,932			$	—			$	192,932
	FNMA		—				292,553				—				292,553
	FHLMC		—				146,882				—				146,882
	GNMA		—				77,797				—				77,797
	U.S. Government and agencies						29,960				—				29,960
	Total assets measured at fair value on a recurring basis	$	—			$	740,124			$	—			$	740,124
	Assets measured at fair value on a nonrecurring basis Other real estate owned	$	—			$	—			$	5,734			$	5,734
	Loans held-for sale		—				28,508				—				28,508
	Impaired loans		—				—				41,334				41,334
	Total assets measured at fair value on a nonrecurring basis	$				$	28,508			$	47,068			$	75,576
Book Value and Estimated Fair Value of Financial Instruments	The book value and estimated fair value of our financial instruments are as follows:
	(In Thousands)	Fair Value		March 31, 2015								December 31, 2014
		Measurement		Book Value				Fair Value				Book Value				Fair Value
	Financial assets:
	Cash and cash equivalents	Level 1		$	505,638				505,638			$	508,039			$	509,039
	Investment securities available-for-sale	See previous			786,497				786,497				740,124				740,124
		table
	Investment securities held-to-maturity	See previous			122,887				122,772				126,168				126,171
		table
	Loans, held-for-sale	See previous			46,892				46,892				28,508				28,508
		table
	Loans, net	Level 2			3,189,138				3,159,907				3,156,652				3,121,855
	Reverse mortgage loans	Level 3			27,035				27,035				29,298				29,298
	Stock in FHLB of Pittsburgh	Level 2			27,655				27,655				23,278				23,278
	Accrued interest receivable	Level 2			12,004				12,004				11,782				11,782
	Other assets	Level 3			—				4,837				—				4,837
	Financial liabilities:
	Deposits	Level 2			3,522,278				3,345,564				3,649,235				3,461,218
	Borrowed funds	Level 2			874,557				877,815				667,775				672,850
	Standby letters of credit	Level 3			160				160				151				151
	Accrued interest payable	Level 2			1,621				1,621				1,004				1,004

Segment_Information_Tables

Segment Information (Tables)	3 Months Ended
	Mar. 31, 2015
Segment Reporting [Abstract]
Details of Segment Information	Segment information for the three months ended March 31, 2015 and March 31, 2014 follows:
	For the three months ended March 31, 2015:
	(In Thousands)	WSFS Bank		Cash		Wealth		Total
	Statement of Operations			Connect		Management
	External customer revenues:
	Interest income	$	40,823	$	—	$	2,028	$	42,851
	Noninterest income		9,189		6,639		5,267		21,095
	Total external customer revenues		50,012		6,639		7,295		63,946
	Inter-segment revenues:
	Interest income		871		—		1,447		2,318
	Noninterest income		1,784		168		18		1,970
	Total inter-segment revenues		2,655		168		1,465		4,288
	Total revenue		52,667		6,807		8,760		68,234
	External customer expenses:
	Interest expense		3,912		—		122		4,034
	Noninterest expenses		31,079		4,175		3,659		38,913
	Provision for loan loss		733		—		53		786
	Total external customer expenses		35,724		4,175		3,834		43,733
	Inter-segment expenses
	Interest expense		1,447		373		498		2,318
	Noninterest expenses		186		614		1,170		1,970
	Total inter-segment expenses		1,633		987		1,668		4,288
	Total expenses		37,357		5,162		5,502		48,021
	Income before taxes	$	15,310	$	1,645	$	3,258	$	20,213
	Income tax provision								7,324
	Consolidated net income							$	12,889
	As of March 31, 2015:
	Statement of Condition
	Cash and cash equivalents	$	66,854	$	430,888	$	7,896	$	505,638
	Goodwill		43,690		—		5,134		48,824
	Other segment assets		3,824,272		3,002		564,744		4,392,018
	Total segment assets	$	3,934,816	$	433,890	$	577,774	$	4,946,480
	Capital expenditures	$	817	$	—	$	—	$	817
	For the three months ended March 31, 2014:
	(In Thousands)	WSFS Bank		Cash Connect		Trust &		Total
	Statement of Operations					Wealth
						Management
	External customer revenues:
	Interest income	$	35,921	$	—	$	1,864	$	37,785
	Noninterest income		8,395		6,014		3,955		18,364
	Total external customer revenues		44,316		6,014		5,819		56,149
	Inter-segment revenues:
	Interest income		831		—		1,421		2,252
	Noninterest income		1,738		193		26		1,957
	Total inter-segment revenues		2,569		193		1,447		4,209
	Total revenue		46,885		6,207		7,266		60,358
	External customer expenses:
	Interest expense		3,630		—		111		3,741
	Noninterest expenses		27,318		3,550		3,016		33,884
	Provision for loan loss		2,323		—		307		2,630
	Total external customer expenses		33,271		3,550		3,434		40,255
	Inter-segment expenses
	Interest expense		1,421		331		500		2,252
	Noninterest expenses		219		586		1,152		1,957
	Total inter-segment expenses		1,640		917		1,652		4,209
	Total expenses		34,911		4,467		5,086		44,464
	Income before taxes	$	11,974	$	1,740	$	2,180	$	15,894
	Income tax (benefit)								(1,017	)
	Consolidated net income								16,911
	Capital expenditures	$	478	$	56	$	3	$	537
	As of December 31, 2014:
	Statement of Condition
	Cash and cash equivalents	$	73,395	$	431,527	$	3,117	$	508,039
	Goodwill		43,517		—		5,134		48,651
Other segment assets		4,107,212		2,006		187,412		4,296,630
Total segment assets	$	4,224,124	$	433,533	$	195,663	$	4,853,320

Change_in_Accumulated_Other_Co1

Change in Accumulated Other Comprehensive Income (Loss) (Tables)	3 Months Ended
	Mar. 31, 2015
Equity [Abstract]
Components of Accumulated Other Comprehensive Income	Changes to accumulated other comprehensive income by component are shown net of taxes in the following tables for the period indicated:
	(In Thousands)	Net unrealized			Net unrealized			Total
		(losses) gains  on			losses on defined
		investment			benefit pension
		securities			plan
		available-for-sale
	Balance, December 31, 2014	$	2,653		$	847		$	3,500
	Other comprehensive income before reclassifications		4,567			(15	)		4,552
	Less: Amounts reclassified from accumulated other comprehensive income		(280	)		—			(280	)
	Amortization of unrealized gain on securities reclassified to held-to-maturity		(171	)		—			(171	)
	Net current-period other comprehensive income		4,116			(15	)		4,101
	Balance, March 31, 2015	$	6,769		$	832		$	7,601
	Balance, December 31, 2014	$	(20,822	)	$	(472	)	$	(21,294	)
	Other comprehensive income before reclassifications		9,145			—			9,145
	Less: Amounts reclassified from accumulated other comprehensive income		(358	)		—			(358	)
	Net current-period other comprehensive income		8,787			—			8,787
	Balance, March 31, 2014	$	(12,035	)	$	(472	)	$	(12,507	)
Components of Other Comprehensive Income	The statement of operations impacted by components of other comprehensive income are presented in the table below:
	(In Thousands)	Three Months Ended						Affected line item in Statements of
		March 31,						Operations
	Securities available-for-sale:	2015			2014
	Realized gains on securities transactions	$	451		$	578		Securities gains, net
	Income taxes		(171	)		(220	)	Income tax provision
	Net of tax	$	280		$	358
	Net unrealized holding gains on securities transferred between available-for-sale and held-to-maturity:
	Amortization of net unrealized gains to income during the period	$	(171	)	$	—		Interest income on investment securities
	Amortization of Defined Benefit Pension items:
	Prior service (credits) costs	$	(19	)	$	—		Salaries, benefits and other compensation
	Actuarial (gains) losses		(5	)		—		Income tax provision
	Total before tax	$	(24	)	$	—
	Income taxes		(9	)		—
	Net of tax		(15	)		—
	Total reclassifications	$	94		$	358

Subsequent_Events_Tables

Subsequent Events (Tables)	3 Months Ended
	Mar. 31, 2015
Subsequent Events [Abstract]
Pro Forma Effect on Share Amounts	The pro forma effect on share amounts included in the unaudited Consolidated Statements of Condition are as follows:
		March 31,		December 31,
		2015		2014
	Shares authorized		65,000,000		65,000,000
	Shares issued		37,441,473		37,370,932
	Treasury stock		9,174,735		9,163,096
Pro Forma Computation of Basic and Diluted Earnings Per Share	The following shows the pro forma computation of basic and diluted earnings per share:
	(In Thousands, Except Per Share Data)	For the three months ended
		March 31,
		2015		2014
		(unaudited)
	Numerator:
	Net income	$	12,889	$	16,911
	Denominator:
	Weighted average basic share		28,218		26,712
	Dilutive potential common shares		534		672
	Weighted average fully dilutive shares		28,752		27,384
	Earnings per share:
	Basic	$	0.46	$	0.63
	Diluted	$	0.45	$	0.62
	Outstanding common stock equivalents having no dilutive effect		237		132

Basis_of_Presentation_Addition

Basis of Presentation - Additional Information (Detail) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014	Dec. 31, 2013	Mar. 15, 2014
	Office				Subsidiary
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of unconsolidated affiliate	1
Number of banking offices	56
Number of shares reserved for issuance under 2013 Plan	660,682	735,898	661,345	712,578
Stock options granted, vest in percentage per annum increments	25.00%		25.00%	25.00%
Stock option exercisable period description	Start to become exercisable one year from the grant date and expire between five and seven years from the grant date
Total unrecognized compensation cost of nonvested stock options	$4,800,000
Expected weighted-average period	2 years 9 months 18 days
Shares vesting period	Two year
Return on investment of cost of restricted stock	50.00%
Compensation expense	64,000,000,000	69,000,000,000
Impact of stock-based compensation before tax	842,000		802,000
Benefits and other compensation per share	$0.06		$0.06
Delaware [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of banking offices	45
Pennsylvania [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of banking offices	9
Virginia [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of banking offices	1
Nevada [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of banking offices	1
WSFS Financial Corporation [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of wholly-owned subsidiaries					3
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance award vesting period	5 years
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance award vesting period	7 years
Restricted Stock and Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units and awards issued	12,714
Performance award vesting period	4 years
Total amount of compensation cost of relating to non-vested restricted stock	1,800,000
Weighted-Average Remaining Contractual Life	3 years 1 month 6 days
Performance Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance award vesting period			4 years
Restricted stock units and awards issued			36,152
Aggregate shares of restricted stock awarded	77,800
Number of participants under Long-Term Program	14
Percentage of annual return on assets			1.00%
Vesting description	The awarded restricted stock units will vest in 25% increments over four years
Stock-based compensation expense	102,000
Restricted Stock [Member] | Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance award vesting period	5 years
Restricted stock granted	22,250
Shares of restricted stock vested	5,563
Performance Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Impact of stock-based compensation after tax	$593,000		$577,000
Stock Incentive 2013 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Termination year of the plan	2023
Number of shares reserved for issuance under 2013 Plan	698,845
Shares available for future grants under 2013 Plan	298,439

Basis_of_Presentation_Summary_

Basis of Presentation - Summary of Stock Options Outstanding (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Stock Options:
Outstanding at beginning of period, Shares	661,345	712,578
Granted, Shares	24,576	43,686
Exercised, Shares	-25,239	-20,366
Outstanding at end of period	660,682	735,898
Exercisable at end of period, Shares	276,412	137,005
Weighted-average fair value of awards granted, Shares	$17.20	$17.35
Outstanding at beginning of period, Weighted-Average Exercise Price	$49.15	$47.42
Granted, Weighted-Average Exercise Price	$78.71	$71.47
Exercised, Weighted-Average Exercise Price	$45.55	$33.80
Outstanding at end of period, Weighted-Average Exercise Price	$50.39	$49.23
Exercisable at end of period, Weighted-Average Exercise Price	$48.18	$47.08

Basis_of_Presentation_Schedule

Basis of Presentation - Schedule of Unvested Stock Option Outstanding (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Stock Options:
Unvested at beginning of period, Shares	576,381	609,029
Granted, Shares	24,576	43,686
Vested, Shares	-216,687	-53,822
Unvested at end of period, Shares	384,270	598,893
Unvested at beginning of period, Weighted-Average Exercise Price	$50.01	$47.66
Granted, Weighted-Average Exercise Price	$78.71	$71.47
Vested, Weighted-Average Exercise Price	$49.79	$44.11
Unvested at end of period, Weighted-Average Exercise Price	$51.97	$49.72

Business_Combinations_Addition

Business Combinations - Additional Information (Detail) (USD $)	0 Months Ended	3 Months Ended		0 Months Ended
	Sep. 05, 2014	Mar. 31, 2015	Mar. 31, 2014	Mar. 03, 2015	Nov. 25, 2013	Dec. 31, 2014
				Branch
Business Acquisition [Line Items]
Assets		$4,946,480,000				$4,853,320,000
Loans		3,189,138,000				3,156,652,000
Deposits		3,522,278,000				3,649,235,000
Cash paid to FNBW stockholders	32,028,000
Common stock shares issued	452,661
Transaction value, cash and stock	64,936,000
Goodwill resulting from acquisition of FNBW		48,824,000				48,651,000
Equipment expense		2,082,000	1,687,000
Salary and benefits		21,010,000	18,474,000
Professional fees		1,472,000	1,106,000
Data processing expense		1,422,000	1,471,000
Alliance [Member]
Business Acquisition [Line Items]
Assets						421,000,000
Loans						310,000,000
Deposits						345,000,000
Number of branch locations				8
First Wyoming Financial Corporation [Member]
Business Acquisition [Line Items]
Cash paid to FNBW stockholders					32,000,000
Common stock shares issued					452,661
Goodwill resulting from acquisition of FNBW	16,543,000	16,543,000				16,370,000
First Wyoming Financial Corporation [Member] | Core Deposits [Member]
Business Acquisition [Line Items]
Core deposit intangibles	3,200,000
Amortized period	10 years
First Wyoming Financial Corporation [Member] | Acquisition Related Costs [Member]
Business Acquisition [Line Items]
Integration expenses		35,000	247,000
Equipment expense		16,000
Salary and benefits		10,000
Professional fees		3,000	237,000
Data processing expense		$3,000
First Wyoming Financial Corporation [Member] | NASDAQ Stock Market [Member]
Business Acquisition [Line Items]
Closing share price	$72.70

Business_Combinations_Summary_

Business Combinations - Summary of Consideration Paid and Fair Value of Identifiable Assets Acquired and Liabilities Assumed (Detail) (USD $)	0 Months Ended
In Thousands, unless otherwise specified	Sep. 05, 2014	Nov. 25, 2013	Mar. 31, 2015	Dec. 31, 2014
Consideration Paid:
Common shares issued (452,661)	$32,908
Cash paid to FNBW stockholders	32,028
Value of consideration	64,936
Assets acquired:
Cash and due from banks	40,605
Investment securities	41,822
Loans	175,894
Premises and equipment	1,644
Deferred income taxes	3,139
Bank owned life insurance	12,576
Core deposit intangible	3,240
Other Real Estate Owned	1,593
Other assets	4,766
Total assets	285,279
Liabilities assumed:
Deposits	228,844
FHLB advances	5,052
Other liabilities	2,990
Total liabilities	236,886
Net assets acquired:	48,393
Goodwill resulting from acquisition of FNBW:			48,824	48,651
First Wyoming Financial Corporation [Member]
Consideration Paid:
Cash paid to FNBW stockholders		32,000
Liabilities assumed:
Goodwill resulting from acquisition of FNBW:	$16,543		$16,543	$16,370

Business_Combinations_Summary_1

Business Combinations - Summary of Consideration Paid and Fair Value of Identifiable Assets Acquired and Liabilities Assumed (Parenthetical) (Detail)	0 Months Ended
	Sep. 05, 2014
Business Combinations [Abstract]
Common stock shares issued	452,661

Business_Combinations_Summary_2

Business Combinations - Summary of Effect on Goodwill from Changes in Derivative Assets and Liabilities (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Sep. 05, 2014
Business Acquisition [Line Items]
Goodwill, Beginning balance		$48,651
Goodwill, Ending balance	48,824	48,651
First Wyoming Financial Corporation [Member]
Business Acquisition [Line Items]
Goodwill, Beginning balance		16,370	16,543
Goodwill, Ending balance	16,543	16,370	16,543
First Wyoming Financial Corporation [Member] | Assets [Member]
Business Acquisition [Line Items]
Effect of adjustments	$173

Earnings_Per_Share_Computation

Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Detail) (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Numerator:
Net Income	$12,889	$16,911
Denominator:
Weighted average basic shares	9,406	8,904
Dilutive potential common shares	178	224
Weighted average fully diluted shares	9,584	9,128
Outstanding common stock equivalents having no dilutive effect	79	44
Basic	$1.37	$1.90
Diluted	$1.34	$1.85

Investment_Securities_Addition

Investment Securities - Additional Information (Detail) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Trading securities	$0
Securities pledged as collateral	423,900,000		470,400,000
FHLB pledged investment securities	0		0
Proceeds from sale of investment securities	37,400,000	37,800,000
Gains from sale of investment securities	451,000	578,000
Losses from sale of investment securities	0	0
Unamortized premiums	22,500,000		22,400,000
Unaccreted discounts	66,000		188,000
Held-to-maturity securities, unrealized loss			0
Owned investment securities	206,438,000		330,754,000
Total unrealized losses on securities	1,435,000		3,594,000
Mortgage-Backed Securities ("MBS") [Member]
Schedule of Available-for-sale Securities [Line Items]
Weighted average duration of MBS portfolio	3 years 9 months 18 days
OTTI on evaluation of securities	0		0
Bond [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair market value of investment			1,300,000
Municipal Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of securities transferred from available-for-sale to held-to-maturity			161
Securities transferred from available-for-sale to held-to-maturity, Fair value			$124,900,000

Investment_Securities_Schedule

Investment Securities - Schedule of Amortized Cost and Estimated Fair Value of Available-for-Sale and Held-to-Maturity Investment Securities (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$778,866	$739,404
Gross Unrealized Gain	8,528	4,314
Gross Unrealized Loss	897	3,594
Fair Value	786,497	740,124
Held-to-maturity Securities, Amortized Cost	122,887	126,168
Held-to-maturity Securities, Fair Value	122,771	126,171
Collateralized Mortgage Obligation (CMO) [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	219,054	193,672
Gross Unrealized Gain	2,491	874
Gross Unrealized Loss	524	1,614
Fair Value	221,021	192,932
Federal National Mortgage Association (FNMA) [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	300,690	291,606
Gross Unrealized Gain	3,627	2,053
Gross Unrealized Loss	190	1,106
Fair Value	304,127	292,553
Federal Home Loan Mortgage Corporation (FHLMC) [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	149,799	146,742
Gross Unrealized Gain	1,337	672
Gross Unrealized Loss	122	532
Fair Value	151,014	146,882
Government National Mortgage Association (GNMA) [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	74,293	77,364
Gross Unrealized Gain	1,022	701
Gross Unrealized Loss	49	268
Fair Value	75,266	77,797
U.S. Government and Government Sponsored Enterprises (GSE) [Member]
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	35,030	30,020
Gross Unrealized Gain	51	14
Gross Unrealized Loss	12	74
Fair Value	35,069	29,960
State and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Held-to-maturity Securities, Amortized Cost	122,887	126,168
Held-to-maturity Securities, Gross Unrealized Gain	422	3
Held-to-maturity Securities, Gross Unrealized Loss	538
Held-to-maturity Securities, Fair Value	$122,771	$126,171

Investment_Securities_Schedule1

Investment Securities - Schedule of Amortized Cost of Held-to-Maturity Investments (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity Securities, Original Cost	$119,499
Held-to-maturity Securities, Unrealized Gain at Transfer	3,559
Held-to-maturity Securities, Accretion	-171
Held-to-maturity Securities, Amortized Cost	122,887	126,168
Transferred Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity Securities, Original Cost	118,204
Held-to-maturity Securities, Unrealized Gain at Transfer	3,559
Held-to-maturity Securities, Accretion	-171
Held-to-maturity Securities, Amortized Cost	121,592
Other Held-to-Maturity Securities [Member]
Schedule of Held-to-maturity Securities [Line Items]
Held-to-maturity Securities, Original Cost	1,295
Held-to-maturity Securities, Amortized Cost	$1,295

Investment_Securities_Schedule2

Investment Securities - Schedule of Maturities of Investment Securities Available-for-Sale and Held-to-Maturity (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	$778,866	$739,404
Fair Value	786,497	740,124
Held-to-maturity Securities, Amortized Cost	122,887	126,168
Held-to-maturity Securities, Fair Value	122,771	126,171
Within One Year [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	10,000	10,000
Fair Value	10,008	10,014
Held-to-maturity Securities, Amortized Cost	3,761	3,608
Held-to-maturity Securities, Fair Value	3,764	3,608
After One Year But Within Five Years [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	28,045	20,020
Fair Value	28,071	19,946
Held-to-maturity Securities, Amortized Cost	3,636	6,217
Held-to-maturity Securities, Fair Value	3,642	6,217
After Five Years But Within Ten Years [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	146,878	134,453
Fair Value	148,062	133,395
Held-to-maturity Securities, Amortized Cost	9,310	9,733
Held-to-maturity Securities, Fair Value	9,405	9,736
After Ten Years [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost	593,943	574,931
Fair Value	600,356	576,769
Held-to-maturity Securities, Amortized Cost	106,180	106,610
Held-to-maturity Securities, Fair Value	$105,960	$106,610

Investment_Securities_Schedule3

Investment Securities - Schedule of Investment Securities' Gross Unrealized Losses and Fair Value by Investment Category (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Less than 12 months, Fair Value	$169,832	$59,338
Available-for-sale securities, Less than 12 months, Unrealized Loss	847	236
Available-for-sale securities, 12 months or longer, Fair Value	36,606	271,416
Available-for-sale securities, 12 months or longer, Unrealized Loss	588	3,358
Available-for-sale securities, Total, Fair Value	206,438	330,754
Available-for-sale securities, Total, Unrealized Loss	1,435	3,594
Collateralized Mortgage Obligation (CMO) [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Less than 12 months, Fair Value	23,240	15,492
Available-for-sale securities, Less than 12 months, Unrealized Loss	71	108
Available-for-sale securities, 12 months or longer, Fair Value	29,601	61,630
Available-for-sale securities, 12 months or longer, Unrealized Loss	453	1,506
Available-for-sale securities, Total, Fair Value	52,841	77,122
Available-for-sale securities, Total, Unrealized Loss	524	1,614
Federal National Mortgage Association (FNMA) [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Less than 12 months, Fair Value	48,218
Available-for-sale securities, Less than 12 months, Unrealized Loss	190
Available-for-sale securities, 12 months or longer, Fair Value		103,207
Available-for-sale securities, 12 months or longer, Unrealized Loss		1,106
Available-for-sale securities, Total, Fair Value	48,218	103,207
Available-for-sale securities, Total, Unrealized Loss	190	1,106
Federal Home Loan Mortgage Corporation (FHLMC) [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Less than 12 months, Fair Value	22,756	23,901
Available-for-sale securities, Less than 12 months, Unrealized Loss	36	54
Available-for-sale securities, 12 months or longer, Fair Value	4,373	58,267
Available-for-sale securities, 12 months or longer, Unrealized Loss	86	478
Available-for-sale securities, Total, Fair Value	27,129	82,168
Available-for-sale securities, Total, Unrealized Loss	122	532
Government National Mortgage Association (GNMA) [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, 12 months or longer, Fair Value	2,632	48,312
Available-for-sale securities, 12 months or longer, Unrealized Loss	49	268
Available-for-sale securities, Total, Fair Value	2,632	48,312
Available-for-sale securities, Total, Unrealized Loss	49	268
U.S. Government and Government Sponsored Enterprises (GSE) [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Less than 12 months, Fair Value	8,010	19,945
Available-for-sale securities, Less than 12 months, Unrealized Loss	12	74
Available-for-sale securities, Total, Fair Value	8,010	19,945
Available-for-sale securities, Total, Unrealized Loss	12	74
State and Political Subdivisions [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale securities, Less than 12 months, Fair Value	67,608
Available-for-sale securities, Less than 12 months, Unrealized Loss	538
Available-for-sale securities, Total, Fair Value	67,608
Available-for-sale securities, Total, Unrealized Loss	$538

Loans_Summary_of_Loan_Portfoli

Loans - Summary of Loan Portfolio by Category (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$3,234,959	$3,202,498	$3,004,672
Deferred fees, net	6,314	6,420
Allowance for loan losses	39,507	39,426	41,328	41,244
Net loans	3,189,138	3,156,652
Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	923,070	920,072	838,181
Allowance for loan losses	13,048	12,837	12,404	12,751
Owner Occupied Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	797,400	788,598	799,213
Allowance for loan losses	7,039	6,643	8,789	7,638
Construction Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	153,224	142,497
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	324,232	327,543
Commercial Mortgage [Member] | Real Estate Mortgage Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	820,836	805,459
Residential (1-4 Family) [Member] | Real Estate Mortgage Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$216,197	$218,329

Loans_Schedule_of_Loans_Acquir

Loans - Schedule of Loans Acquired Through Merger in Accordance with FASB ASC 310-30 (Detail) (First Wyoming Financial Corporation [Member], USD $)	Sep. 05, 2014
In Thousands, unless otherwise specified
First Wyoming Financial Corporation [Member]
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items]
Contractually required principal and interest at acquisition	$27,086
Contractual cash flows not expected to be collected (nonaccretable difference)	7,956
Expected cash flows at acquisition	19,130
Interest component of expected cash flows (accretable yield)	1,790
Fair value of acquired loans accounted for under FASB ASC 310-30	$17,340

Loans_Schedule_of_Outstanding_

Loans - Schedule of Outstanding Principal Balance and Carrying Amounts for Acquired Credit-Impaired Loans (Detail) (USD $)	Mar. 31, 2015
In Thousands, unless otherwise specified
Receivables [Abstract]
Outstanding principal balance	$21,925
Carrying amount	15,336
Allowance for Loan loss	$0

Loans_Summary_of_Changes_in_Ac

Loans - Summary of Changes in Accretable Yield on Acquired Credit Impaired Loans (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015
Receivables [Abstract]
Balance at beginning of period	$1,498
Accretion	-179
Additions/adjustments	-3
Balance at the end of the period	$1,316

Allowance_for_Loan_Losses_and_2

Allowance for Loan Losses and Credit Quality Information - Additional Information (Detail) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
	SecurityLoan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Net charge-offs	$705,000	$2,500,000
Percentage of average loans annualized, charged-offs	0.09%	0.34%
Calculated probability of default rate	Probability of default is calculated based on the historical rate of migration to impaired status during the last 17 quarters.
Adjustment in basis points	0.10%
Basis points	0.05%
Additional adjustment factors contributed to total allowance	1,000,000
Interest income on impaired loans	472,000	353,000
Balance of troubled debt restructurings	34,800,000		36,200,000
TDRs in nonaccrual status	12,300,000		13,600,000
TDRs in accrual status	22,500,000		22,600,000
Troubled debt restructuring related reserves	4,300,000		4,200,000
Usual sustained repayment performance period	6 months
Number of term loans modified in troubled debt restructurings	6
Number of term loans modified in troubled debt restructurings, discharged bankruptcies	5
Increase in allowance for loan losses	0	1,000
Troubled debt restructurings charged off	0	40,000
Commercial And Industrial Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Basis points	0.08%
Retail Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Calculated pooled reserves for retail loans	Pooled reserves for retail loans are calculated based solely on the previous four year average net loss rate.
Total Residential and Consumer Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Impairment loans, charge off period	90 days
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of term loans modified in troubled debt restructurings	1
Number of term loans modified in troubled debt restructurings, discharged bankruptcies	2
Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of residential loans in the process of foreclosure	28		36
Total loans outstanding, residential loans	3,100,000		4,400,000
Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of commercial loans	15		12
Total loans outstanding,commercial loans	$3,300,000		$1,100,000
Residential Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of term loans modified in troubled debt restructurings, discharged bankruptcies	3
Minimum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Period for impairment loans	90 days

Allowance_for_Loan_Losses_and_3

Allowance for Loan Losses and Credit Quality Information - Schedule of Allowance for Loan Losses and Loan Balances (Detail) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	$39,426,000	$41,244,000	$41,244,000
Charge-offs	-1,075,000	-3,155,000
Recoveries	370,000	609,000
Provision (credit)	786,000	2,630,000
Ending balance	39,507,000	41,328,000	39,426,000
Loans individually evaluated for impairment	4,834,000	5,068,000
Loans collectively evaluated for impairment	34,673,000	36,260,000
Ending balance	39,507,000	41,328,000
Loans individually evaluated for impairment	43,179,000	51,707,000	46,651,000
Loans collectively evaluated for impairment	3,034,728,000	2,952,965,000
Acquired nonimpaired loans	141,716,000		145,800,000
Acquired impaired loans	15,336,000		15,893,000
Ending balance	3,234,959,000	3,004,672,000	3,202,498,000
Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	12,837,000	12,751,000	12,751,000
Charge-offs	-131,000	-1,113,000
Recoveries	26,000	324,000
Provision (credit)	316,000	442,000
Ending balance	13,048,000	12,404,000	12,837,000
Loans individually evaluated for impairment	3,169,000	1,865,000
Loans collectively evaluated for impairment	9,879,000	10,539,000
Ending balance	13,048,000	12,404,000
Loans individually evaluated for impairment	11,707,000	4,583,000	12,381,000
Loans collectively evaluated for impairment	876,434,000	833,598,000
Acquired nonimpaired loans	31,737,000
Acquired impaired loans	3,192,000		3,269,000
Ending balance	923,070,000	838,181,000	920,072,000
Owner Occupied Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	6,643,000	7,638,000	7,638,000
Charge-offs	-330,000	-197,000
Recoveries	4,000	6,000
Provision (credit)	722,000	1,342,000
Ending balance	7,039,000	8,789,000	6,643,000
Loans individually evaluated for impairment	284,000	1,191,000
Loans collectively evaluated for impairment	6,755,000	7,598,000
Ending balance	7,039,000	8,789,000
Loans individually evaluated for impairment	1,552,000	6,318,000	2,474,000
Loans collectively evaluated for impairment	754,044,000	792,895,000
Acquired nonimpaired loans	39,671,000
Acquired impaired loans	2,133,000		2,264,000
Ending balance	797,400,000	799,213,000	788,598,000
Commercial Mortgages [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	7,266,000	6,932,000	6,932,000
Charge-offs	-39,000	-160,000
Recoveries	79,000	37,000
Provision (credit)	-782,000	554,000
Ending balance	6,524,000	7,363,000	7,266,000
Loans individually evaluated for impairment	223,000	1,019,000
Loans collectively evaluated for impairment	6,301,000	6,344,000
Ending balance	6,524,000	7,363,000
Loans individually evaluated for impairment	7,595,000	15,786,000	8,335,000
Loans collectively evaluated for impairment	770,991,000	730,543,000
Acquired nonimpaired loans	36,373,000
Acquired impaired loans	5,877,000		5,976,000
Ending balance	820,836,000	746,329,000	805,459,000
Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	2,596,000	3,326,000	3,326,000
Charge-offs		-88,000
Recoveries	49,000	7,000
Provision (credit)	307,000	-529,000
Ending balance	2,952,000	2,716,000	2,596,000
Loans individually evaluated for impairment	210,000
Loans collectively evaluated for impairment	2,742,000	2,716,000
Ending balance	2,952,000	2,716,000
Loans individually evaluated for impairment	1,419,000	1,070,000	1,419,000
Loans collectively evaluated for impairment	138,495,000	100,415,000
Acquired nonimpaired loans	9,680,000
Acquired impaired loans	3,630,000		3,863,000
Ending balance	153,224,000	101,485,000	142,497,000
Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	2,523,000	3,078,000	3,078,000
Charge-offs	-125,000	-364,000
Recoveries	11,000	18,000
Provision (credit)	-29,000	33,000
Ending balance	2,380,000	2,765,000	2,523,000
Loans individually evaluated for impairment	751,000	807,000
Loans collectively evaluated for impairment	1,629,000	1,958,000
Ending balance	2,380,000	2,765,000
Loans individually evaluated for impairment	14,749,000	18,413,000	15,666,000
Loans collectively evaluated for impairment	184,337,000	199,740,000
Acquired nonimpaired loans	16,615,000
Acquired impaired loans	496,000		512,000
Ending balance	216,197,000	218,153,000	218,329,000
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	6,041,000	6,494,000	6,494,000
Charge-offs	-450,000	-1,233,000
Recoveries	201,000	217,000
Provision (credit)	234,000	771,000
Ending balance	6,026,000	6,249,000	6,041,000
Loans individually evaluated for impairment	197,000	186,000
Loans collectively evaluated for impairment	5,829,000	6,063,000
Ending balance	6,026,000	6,249,000
Loans individually evaluated for impairment	6,157,000	5,537,000	6,376,000
Loans collectively evaluated for impairment	310,427,000	295,774,000
Acquired nonimpaired loans	7,640,000
Acquired impaired loans	8,000		9,000
Ending balance	324,232,000	301,311,000	327,543,000
Estimation/Complexity Risk [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance	1,520,000	1,025,000	1,025,000
Provision (credit)	18,000	17,000
Ending balance	1,538,000	1,042,000
Loans collectively evaluated for impairment	1,538,000	1,042,000
Ending balance	$1,538,000	$1,042,000

Allowance_for_Loan_Losses_and_4

Allowance for Loan Losses and Credit Quality Information - Schedule of Allowance for Loan Losses and Loan Balances (Parenthetical) (Detail) (USD $)	Mar. 31, 2015	Mar. 31, 2014
In Millions, unless otherwise specified
Receivables [Abstract]
Accrued troubled debt restructured loans	$22.50	$11.60

Allowance_for_Loan_Losses_and_5

Allowance for Loan Losses and Credit Quality Information - Summary of Nonaccrual and Past Due Loans (Detail) (USD $)	3 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due and Still Accruing, Total	$8,804	$6,431
60-89 Days Past Due and Still Accruing, Total	874	946
Greater Than 90 Days Past Due and Still Accruing, Total	694	4
Total Past Due And Still Accruing, Total	10,372	7,381
Accruing Current Balances, Total	3,188,570	3,155,173
Acquired Impaired Loans ,Total	15,336	15,893
Nonaccrual Loans, Total	20,681	24,051
Total Loans	3,234,959	3,202,498	3,004,672
30-59 Days Past Due and Still Accruing, % of Total Loans	0.27%	0.20%
60-89 Days Past Due and Still Accruing, % of Total Loans	0.03%	0.03%
Greater Than 90 Days Past Due and Still Accruing, % of Total Loans	0.02%
Total Past Due And Still Accruing, % of Total Loans	0.32%	0.23%
Accruing Current Balances, % of Total Loans	98.57%	98.52%
Acquired Impaired Loans, % of Total Loans	0.47%	0.50%
Nonaccrual Loans, % of Total Loans	0.64%	0.75%
% of Total Loans	100.00%	100.00%
Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due and Still Accruing, Total	3,085	715
60-89 Days Past Due and Still Accruing, Total	9
Total Past Due And Still Accruing, Total	3,094	715
Accruing Current Balances, Total	914,677	913,382
Acquired Impaired Loans ,Total	3,192	3,269
Nonaccrual Loans, Total	2,107	2,706
Total Loans	923,070	920,072	838,181
Owner Occupied Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due and Still Accruing, Total	1,362	393
Total Past Due And Still Accruing, Total	1,362	393
Accruing Current Balances, Total	792,353	783,466
Acquired Impaired Loans ,Total	2,133	2,264
Nonaccrual Loans, Total	1,552	2,475
Total Loans	797,400	788,598	799,213
Commercial Mortgages [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due and Still Accruing, Total		203
Greater Than 90 Days Past Due and Still Accruing, Total	100
Total Past Due And Still Accruing, Total	100	203
Accruing Current Balances, Total	807,351	791,035
Acquired Impaired Loans ,Total	5,877	5,976
Nonaccrual Loans, Total	7,508	8,245
Total Loans	820,836	805,459	746,329
Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Accruing Current Balances, Total	149,594	138,634
Acquired Impaired Loans ,Total	3,630	3,863
Total Loans	153,224	142,497	101,485
Residential [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due and Still Accruing, Total	3,618	3,879
60-89 Days Past Due and Still Accruing, Total	674	604
Greater Than 90 Days Past Due and Still Accruing, Total	492
Total Past Due And Still Accruing, Total	4,784	4,483
Accruing Current Balances, Total	204,690	206,266
Acquired Impaired Loans ,Total	496	512
Nonaccrual Loans, Total	6,227	7,068
Total Loans	216,197	218,329	218,153
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due and Still Accruing, Total	739	1,241
60-89 Days Past Due and Still Accruing, Total	191	342
Greater Than 90 Days Past Due and Still Accruing, Total	102	4
Total Past Due And Still Accruing, Total	1,032	1,587
Accruing Current Balances, Total	319,905	322,390
Acquired Impaired Loans ,Total	8	9
Nonaccrual Loans, Total	3,287	3,557
Total Loans	$324,232	$327,543	$301,311

Allowance_for_Loan_Losses_and_6

Allowance for Loan Losses and Credit Quality Information - Summary of Nonaccrual and Past Due Loans (Parenthetical) (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Receivables [Abstract]
Acquired nonimpaired loans	$141,716	$145,800

Allowance_for_Loan_Losses_and_7

Allowance for Loan Losses and Credit Quality Information - Analysis of Impaired Loans (Detail) (USD $)	3 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Ending Loan Balances	$43,179	$46,651	$51,707
Loans with No Related Reserve	18,889	17,802
Loans with Related Reserve	24,290	28,849
Related Reserve	4,834	5,317
Contractual Principal Balances	50,634	66,563
Average Loan Balances	45,609	45,629
Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Ending Loan Balances	11,707	12,381	4,583
Loans with No Related Reserve	592	580
Loans with Related Reserve	11,115	11,801
Related Reserve	3,169	3,034
Contractual Principal Balances	12,491	20,924
Average Loan Balances	7,293	5,952
Owner Occupied Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Ending Loan Balances	1,552	2,474	6,318
Loans with No Related Reserve	1,268	1,865
Loans with Related Reserve	284	609
Related Reserve	284	609
Contractual Principal Balances	2,625	3,708
Average Loan Balances	3,732	4,461
Commercial Mortgages [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Ending Loan Balances	7,595	8,335	15,786
Loans with No Related Reserve	4,167	4,732
Loans with Related Reserve	3,428	3,603
Related Reserve	223	319
Contractual Principal Balances	10,516	14,383
Average Loan Balances	10,792	11,005
Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Ending Loan Balances	1,419	1,419	1,070
Loans with Related Reserve	1,419	1,419
Related Reserve	210	334
Contractual Principal Balances	1,419	1,419
Average Loan Balances	1,065	1,013
Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Ending Loan Balances	14,749	15,666	18,413
Loans with No Related Reserve	7,987	7,068
Loans with Related Reserve	6,762	8,598
Related Reserve	751	790
Contractual Principal Balances	16,815	18,967
Average Loan Balances	16,676	17,296
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Ending Loan Balances	6,157	6,376	5,537
Loans with No Related Reserve	4,875	3,557
Loans with Related Reserve	1,282	2,819
Related Reserve	197	231
Contractual Principal Balances	6,768	7,162
Average Loan Balances	$6,051	$5,902

Allowance_for_Loan_Losses_and_8

Allowance for Loan Losses and Credit Quality Information - Schedule of Commercial Credit Exposure (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial Loans	100.00%	100.00%
Total Commercial Loans	$2,694,530	$2,656,626
Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial Loans	33,991	20,798
Accrual [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial Loans	71,028	67,065
Nonaccrual [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial Loans	9,363	11,017
Doubtful / Nonaccrual [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial Loans	3,886	4,296
Total Special and Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial Loans	4.00%	4.00%
Total Commercial Loans	118,268	103,176
Acquired Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial Loans	1.00%
Total Commercial Loans	14,832	15,372
Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Commercial Loans	95.00%	96.00%
Total Commercial Loans	2,561,430	2,538,078
Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial Loans	923,070	920,072
Commercial [Member] | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial Loans	6,085	4,744
Commercial [Member] | Accrual [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial Loans	49,520	42,377
Commercial [Member] | Nonaccrual [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial Loans	811	1,225
Commercial [Member] | Doubtful / Nonaccrual [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial Loans	3,169	3,034
Commercial [Member] | Total Special and Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial Loans	59,585	51,380
Commercial [Member] | Acquired Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial Loans	3,192	3,269
Commercial [Member] | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial Loans	860,293	865,423
Owner Occupied Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial Loans	797,400	788,598
Owner Occupied Commercial [Member] | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial Loans	18,858	6,989
Owner Occupied Commercial [Member] | Accrual [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial Loans	15,677	14,436
Owner Occupied Commercial [Member] | Nonaccrual [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial Loans	1,268	1,865
Owner Occupied Commercial [Member] | Doubtful / Nonaccrual [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial Loans	284	609
Owner Occupied Commercial [Member] | Total Special and Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial Loans	36,087	23,899
Owner Occupied Commercial [Member] | Acquired Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial Loans	2,133	2,264
Owner Occupied Commercial [Member] | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial Loans	759,180	762,435
Commercial Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial Loans	820,836	805,459
Commercial Mortgage [Member] | Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial Loans	9,048	9,065
Commercial Mortgage [Member] | Accrual [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial Loans	4,527	9,167
Commercial Mortgage [Member] | Nonaccrual [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial Loans	7,284	7,927
Commercial Mortgage [Member] | Doubtful / Nonaccrual [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial Loans	223	319
Commercial Mortgage [Member] | Total Special and Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial Loans	21,082	26,478
Commercial Mortgage [Member] | Acquired Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial Loans	5,877	5,976
Commercial Mortgage [Member] | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial Loans	793,877	773,005
Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial Loans	153,224	142,497
Construction [Member] | Accrual [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial Loans	1,304	1,085
Construction [Member] | Doubtful / Nonaccrual [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial Loans	210	334
Construction [Member] | Total Special and Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial Loans	1,514	1,419
Construction [Member] | Acquired Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial Loans	3,630	3,863
Construction [Member] | Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Commercial Loans	$148,080	$137,215

Allowance_for_Loan_Losses_and_9

Allowance for Loan Losses and Credit Quality Information - Schedule of Commercial Credit Exposure (Parenthetical) (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Accounts, Notes, Loans and Financing Receivable [Line Items]
Acquired nonimpaired loans	$141,716	$145,800
Total Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Acquired nonimpaired loans	$117,500	$119,800

Recovered_Sheet1

Allowance for Loan Losses and Credit Quality Information - Schedule of Consumer Credit Exposure (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014
In Thousands, unless otherwise specified
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$3,234,959	$3,202,498	$3,004,672
Total	100.00%	100.00%
Acquired Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	1.00%
Total Residential and Consumer Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	540,429	545,872
Total	100.00%	100.00%
Total Residential and Consumer Loan [Member] | Nonperforming Financing Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	20,906	22,042
Total	4.00%	4.00%
Total Residential and Consumer Loan [Member] | Acquired Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	504	521
Total Residential and Consumer Loan [Member] | Performing Financing Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	519,019	523,309
Total	96.00%	96.00%
Residential [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	216,197	218,329	218,153
Residential [Member] | Nonperforming Financing Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	14,749	15,666
Residential [Member] | Acquired Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	496	512
Residential [Member] | Performing Financing Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	200,952	202,151
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	324,232	327,543	301,311
Consumer [Member] | Nonperforming Financing Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	6,157	6,376
Consumer [Member] | Acquired Impaired Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	8	9
Consumer [Member] | Performing Financing Receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross loans	$318,067	$321,158

Recovered_Sheet2

Allowance for Loan Losses and Credit Quality Information - Schedule of Consumer Credit Exposure (Parenthetical) (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-performing loans of troubled debt restructured mortgages and home equity installment loans	$11,400,000	$11,400,000
Acquired nonimpaired loans	141,716,000	145,800,000
Total Residential and Consumer Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Acquired nonimpaired loans	$24,300,000	$26,000,000

Recovered_Sheet3

Allowance for Loan Losses and Credit Quality Information - Schedule of Loans Identified as Troubled Debt Restructurings During Periods Indicated (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Financing Receivable, Modifications [Line Items]
Total loans identified during the period	$347	$642
Residential [Member]
Financing Receivable, Modifications [Line Items]
Total loans identified during the period	212	279
Consumer [Member]
Financing Receivable, Modifications [Line Items]
Total loans identified during the period	$135	$363

Reverse_Mortgage_Loans_Additio

Reverse Mortgage Loans - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015
	Loans
Reverse Mortgage Loan Activities [Line Items]
Consolidated mortgage investment	$27,000,000
Number of loans	108
Average age of a mortgage backed securities borrower	93 years
Realizable collateral value of mortgage backed securities	50,300,000
Forecasted housing prices increase rate	2.50%
Forecasted housing prices increase rate, following year and thereafter	2.00%
Internal rate of return	17.48%
Cash payments to reverse mortgagors	6,400,000
Decrease in income	286,000
Reduction in collateral value	1.00%
Maximum [Member]
Reverse Mortgage Loan Activities [Line Items]
Net present value increase or decrease	570,000
Change in present value of IRR	1.00%
Minimum [Member]
Reverse Mortgage Loan Activities [Line Items]
Net present value increase or decrease	561,000
Change in present value of IRR	1.00%
Zero Collateral Value [Member]
Reverse Mortgage Loan Activities [Line Items]
Internal rate of return	16.20%
Decrease in income	$623,000
Collateral Value Reduced by One Percent [Member]
Reverse Mortgage Loan Activities [Line Items]
Internal rate of return	16.90%

Reverse_Mortgage_Loans_Summary

Reverse Mortgage Loans - Summary of Estimated Cash Payments to Reverse Mortgagors (Detail) (USD $)	Mar. 31, 2015
In Thousands, unless otherwise specified
Mortgage Banking [Abstract]
Remaining in 2015	$515
2016	548
2017	438
2018	344
2019	269
Years 2020 - 2024	633
Years 2025 - 2029	130
Years 2030 - 2034	20
Thereafter	2
Total	$2,899

Goodwill_and_Intangibles_Sched

Goodwill and Intangibles - Schedule of Allocation of Goodwill to Our Reportable Operating Segments for Purposes of Goodwill Impairment Testing (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Goodwill [Line Items]
Goodwill, Beginning balance	$48,651
Changes in goodwill	173	135
Goodwill, Ending balance	48,824
WSFS Bank [Member]
Goodwill [Line Items]
Goodwill, Beginning balance	43,517
Changes in goodwill	173
Goodwill, Ending balance	43,690
Trust & Wealth Management [Member]
Goodwill [Line Items]
Goodwill, Beginning balance			5,134
Goodwill, Ending balance	$5,134		$5,134

Goodwill_and_Intangibles_Summa

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

Goodwill_and_Intangibles_Addit

Goodwill and Intangibles - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Amortization expense on other intangible assets	$466,000	$345,000
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Amortization expense on other intangible assets	$394,000

Goodwill_and_Intangibles_Sched1

Goodwill and Intangibles - Schedule of Estimated Amortization Expense of Intangibles (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Goodwill and Intangible Assets Disclosure [Abstract]
Remaining in 2015	$1,074
2016	1,238
2017	1,091
2018	1,072
2019	1,055
Thereafter	3,015
Net Intangible Assets	$8,545	$8,942

Associate_Employee_Benefit_Pla2

Associate (Employee) Benefit Plans - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Postemployment Benefits [Abstract]
Postretirement benefit plans eligibility term	Only those Associates who have achieved ten years of service
Net periodic benefit cost, discount rate	A change in the future rates of participation from 50% to 15%
Decrease in discount rate		1.00%
Decreased discount rate percentage		4.00%
Amortization of unrecognized gains losses exceed percentage	10.00%

Associate_Employee_Benefit_Pla3

Associate (Employee) Benefit Plans - Schedule of Net Periodic Benefit Cost Components of Postretirement Benefits (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Postemployment Benefits [Abstract]
Service cost	$15	$88
Interest cost	22	56
Prior service cost amortization	-19
Net (gain) loss recognition	-5	14
Net periodic benefit cost	$13	$158

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Jan. 27, 2014	Dec. 31, 2013
Income Tax Examination [Line Items]
Unrecognized tax benefits	$0
Income tax examination	Federal and state tax returns for the 2011 through 2014 tax years are subject to examination
Income tax examination in process	No state income tax return examinations are currently in process.
SASCO [Member]
Income Tax Examination [Line Items]
Deferred tax asset				4,900,000
Deferred tax asset valuation allowance			4,900,000
Deferred tax liabilities				1,800,000
Income tax benefit		6,700,000
SASCO [Member] | Eliminated [Member]
Income Tax Examination [Line Items]
Deferred tax liabilities			$1,800,000

Fair_Value_Disclosures_Balance

Fair Value Disclosures - Balances of Assets Measured at Fair Value (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014
In Thousands, unless otherwise specified
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value	$786,497	$740,124
Total assets measured at fair value on a recurring basis	786,497	740,124
Assets measured at fair value on a nonrecurring basis	6,088	5,734
Loans held-for-sale	46,892	28,508
Impaired loans (collateral dependent)	38,795	41,334
Total assets measured at fair value on a nonrecurring basis	91,775	75,576
Collateralized Mortgage Obligation (CMO) [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value		192,932
Collateralized Mortgage Obligation (CMO) [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value	221,021
U.S. Government and Agencies [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value		29,960
U.S. Government and Agencies [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value	35,069
Other Real Estate Owned [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Assets measured at fair value on a nonrecurring basis	6,088	5,734
Federal National Mortgage Association (FNMA) [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value	304,127	292,553
Federal National Mortgage Association (FNMA) [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value	304,127
Federal Home Loan Mortgage Corporation (FHLMC) [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value	151,014	146,882
Federal Home Loan Mortgage Corporation (FHLMC) [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value	151,014
Government National Mortgage Association (GNMA) [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value	75,266	77,797
Government National Mortgage Association (GNMA) [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value	75,266
Significant Other Observable Inputs (Level 2) [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Total assets measured at fair value on a recurring basis	786,497	740,124
Loans held-for-sale	46,892	28,508
Total assets measured at fair value on a nonrecurring basis	46,892	28,508
Significant Other Observable Inputs (Level 2) [Member] | Collateralized Mortgage Obligation (CMO) [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value		192,932
Significant Other Observable Inputs (Level 2) [Member] | Collateralized Mortgage Obligation (CMO) [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value	221,021
Significant Other Observable Inputs (Level 2) [Member] | U.S. Government and Agencies [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value		29,960
Significant Other Observable Inputs (Level 2) [Member] | U.S. Government and Agencies [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value	35,069
Significant Other Observable Inputs (Level 2) [Member] | Federal National Mortgage Association (FNMA) [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value		292,553
Significant Other Observable Inputs (Level 2) [Member] | Federal National Mortgage Association (FNMA) [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value	304,127
Significant Other Observable Inputs (Level 2) [Member] | Federal Home Loan Mortgage Corporation (FHLMC) [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value		146,882
Significant Other Observable Inputs (Level 2) [Member] | Federal Home Loan Mortgage Corporation (FHLMC) [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value	151,014
Significant Other Observable Inputs (Level 2) [Member] | Government National Mortgage Association (GNMA) [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value		77,797
Significant Other Observable Inputs (Level 2) [Member] | Government National Mortgage Association (GNMA) [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Value	75,266
Significant Unobservable Inputs (Level 3) [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Impaired loans (collateral dependent)	38,795	41,334
Total assets measured at fair value on a nonrecurring basis	44,883	47,068
Significant Unobservable Inputs (Level 3) [Member] | Other Real Estate Owned [Member]
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Assets measured at fair value on a nonrecurring basis	$6,088	$5,734

Fair_Value_Disclosures_Additio

Fair Value Disclosures - Additional Information (Detail) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total Material liabilities measured at fair value	$0	$0
Fair Value	786,497,000	740,124,000
Minimum discount rate on appraisals of collateral securing loan	10.00%
Maximum discount rate on appraisals of collateral securing loan	50.00%
Collateral for collateral dependent loans	38,795,000	41,334,000
Valuation allowance on impaired loans	4,800,000	5,300,000
Commitments to Extend Credit [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Commitments of lending operations	0	0
Impaired Loans (Collateral Dependent) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Collateral for collateral dependent loans	42,800,000	46,700,000
Federal Agency Debentures [Member] | AAA-Rated [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	35,100,000
Federal Agency MBS [Member] | AAA-Rated [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	751,400,000
Visa [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Conversion rate of Class A stock for each share of Class B stock	1.65%
Visa [Member] | Common Class B [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Shares held by company	50,833
Estimated value of shares	$4,800,000

Fair_Value_Disclosures_Book_Va

Fair Value Disclosures - Book Value and Estimated Fair Value of Financial Instruments (Detail) (USD $)	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Financial assets:
Cash and cash equivalents	$505,638	$508,039	$439,725	$484,426
Fair Value	786,497	740,124
Investment securities held-to-maturity	122,887	126,168
Loans, held-for-sale	46,892	28,508
Loans, net	3,189,138	3,156,652
Reverse mortgage loans	27,035	29,298
Stock in FHLB of Pittsburgh	27,655	23,278
Accrued interest receivable	12,004	11,782
Other assets	54,265	54,561
Financial liabilities:
Deposits	3,522,278	3,649,235
Borrowed funds	14,937	11,645
Accrued interest payable	1,621	1,004
Significant Other Observable Inputs (Level 2) [Member]
Financial assets:
Loans, held-for-sale	46,892	28,508
Book Value [Member]
Financial assets:
Fair Value	786,497		740,124
Investment securities held-to-maturity	122,887		126,168
Loans, held-for-sale	46,892		28,508
Book Value [Member] | Quoted Prices in Active Markets for Identical Asset (Level 1) [Member]
Financial assets:
Cash and cash equivalents	505,638		508,039
Book Value [Member] | Significant Other Observable Inputs (Level 2) [Member]
Financial assets:
Loans, net	3,189,138		3,156,652
Stock in FHLB of Pittsburgh	27,655		23,278
Accrued interest receivable	12,004		11,782
Financial liabilities:
Deposits	3,522,278		3,649,235
Borrowed funds	874,557		667,775
Accrued interest payable	1,621		1,004
Book Value [Member] | Significant Unobservable Inputs (Level 3) [Member]
Financial assets:
Reverse mortgage loans	27,035		29,298
Financial liabilities:
Standby letters of credit	160		151
Fair Value [Member]
Financial assets:
Fair Value	786,497		740,124
Investment securities held-to-maturity	122,772		126,171
Loans, held-for-sale	46,892		28,508
Fair Value [Member] | Quoted Prices in Active Markets for Identical Asset (Level 1) [Member]
Financial assets:
Cash and cash equivalents	505,638		509,039
Fair Value [Member] | Significant Other Observable Inputs (Level 2) [Member]
Financial assets:
Loans, net	3,159,907		3,121,855
Stock in FHLB of Pittsburgh	27,655		23,278
Accrued interest receivable	12,004		11,782
Financial liabilities:
Deposits	3,345,564		3,461,218
Borrowed funds	877,815		672,850
Accrued interest payable	1,621		1,004
Fair Value [Member] | Significant Unobservable Inputs (Level 3) [Member]
Financial assets:
Reverse mortgage loans	27,035		29,298
Other assets	4,837		4,837
Financial liabilities:
Standby letters of credit	$160		$151

Segment_Information_Additional

Segment Information - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015
	Segment
	Office
Segment Reporting Information [Line Items]
Number of businesses	3
Number of offices	56
Cypress Capital Management, LLC [Member]
Segment Reporting Information [Line Items]
Assets under management	675,000,000
Christiana Trust [Member]
Segment Reporting Information [Line Items]
Assets under administration	8,700,000,000
Delaware [Member]
Segment Reporting Information [Line Items]
Number of offices	45
Pennsylvania [Member]
Segment Reporting Information [Line Items]
Number of offices	9
Virginia [Member]
Segment Reporting Information [Line Items]
Number of offices	1
Nevada [Member]
Segment Reporting Information [Line Items]
Number of offices	1
WSFS Bank [Member]
Segment Reporting Information [Line Items]
Number of businesses	1
Cash Connect [Member]
Segment Reporting Information [Line Items]
Number of businesses	1
Trust & Wealth Management [Member]
Segment Reporting Information [Line Items]
Number of businesses	1
Number of business lines	4

Segment_Information_Details_of

Segment Information - Details of Segment Information (Detail) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Segment Reporting Information [Line Items]
Interest income	$42,851,000	$37,785,000
Noninterest income	21,095,000	18,364,000
Total revenue	63,946,000	56,149,000
Interest expense	4,034,000	3,741,000
Noninterest expenses	38,913,000	33,884,000
Provision for loan loss	786,000	2,630,000
Total expenses	43,733,000	40,255,000
Income before taxes	20,213,000	15,894,000
Income tax provision (benefit)	7,324,000	-1,017,000
Net Income	12,889,000	16,911,000
Cash and cash equivalents	505,638,000		508,039,000
Goodwill	48,824,000		48,651,000
Other segment assets	4,392,018,000		4,296,630,000
Total assets	4,946,480,000		4,853,320,000
Capital expenditures	817,000		537,000
Inter-Segment Eliminations [Member]
Segment Reporting Information [Line Items]
Interest income	2,318,000	2,252,000
Noninterest income	1,970,000	1,957,000
Total revenue	4,288,000	4,209,000
Interest expense	2,318,000	2,252,000
Noninterest expenses	1,970,000	1,957,000
Total expenses	4,288,000	4,209,000
External Customer [Member]
Segment Reporting Information [Line Items]
Total revenue	68,234,000	60,358,000
Total expenses	48,021,000	44,464,000
WSFS Bank [Member]
Segment Reporting Information [Line Items]
Interest income	40,823,000	35,921,000
Noninterest income	9,189,000	8,395,000
Total revenue	50,012,000	44,316,000
Interest expense	3,912,000	3,630,000
Noninterest expenses	31,079,000	27,318,000
Provision for loan loss	733,000	2,323,000
Total expenses	35,724,000	33,271,000
Income before taxes	15,310,000	11,974,000
Cash and cash equivalents	66,854,000		73,395,000
Goodwill	43,690,000		43,517,000
Other segment assets	3,824,272,000		4,107,212,000
Total assets	3,934,816,000		4,224,124,000
Capital expenditures	817,000		478,000
WSFS Bank [Member] | Inter-Segment Eliminations [Member]
Segment Reporting Information [Line Items]
Interest income	871,000	831,000
Noninterest income	1,784,000	1,738,000
Total revenue	2,655,000	2,569,000
Interest expense	1,447,000	1,421,000
Noninterest expenses	186,000	219,000
Total expenses	1,633,000	1,640,000
WSFS Bank [Member] | External Customer [Member]
Segment Reporting Information [Line Items]
Total revenue	52,667,000	46,885,000
Total expenses	37,357,000	34,911,000
Cash Connect [Member]
Segment Reporting Information [Line Items]
Noninterest income	6,639,000	6,014,000
Total revenue	6,639,000	6,014,000
Noninterest expenses	4,175,000	3,550,000
Total expenses	4,175,000	3,550,000
Income before taxes	1,645,000	1,740,000
Cash and cash equivalents	430,888,000		431,527,000
Other segment assets	3,002,000		2,006,000
Total assets	433,890,000		433,533,000
Capital expenditures			56,000
Cash Connect [Member] | Inter-Segment Eliminations [Member]
Segment Reporting Information [Line Items]
Noninterest income	168,000	193,000
Total revenue	168,000	193,000
Interest expense	373,000	331,000
Noninterest expenses	614,000	586,000
Total expenses	987,000	917,000
Cash Connect [Member] | External Customer [Member]
Segment Reporting Information [Line Items]
Total revenue	6,807,000	6,207,000
Total expenses	5,162,000	4,467,000
Trust & Wealth Management [Member]
Segment Reporting Information [Line Items]
Interest income	2,028,000	1,864,000
Noninterest income	5,267,000	3,955,000
Total revenue	7,295,000	5,819,000
Interest expense	122,000	111,000
Noninterest expenses	3,659,000	3,016,000
Provision for loan loss	53,000	307,000
Total expenses	3,834,000	3,434,000
Income before taxes	3,258,000	2,180,000
Cash and cash equivalents	7,896,000		3,117,000
Goodwill	5,134,000		5,134,000
Other segment assets	564,744,000		187,412,000
Total assets	577,774,000		195,663,000
Capital expenditures			3,000
Trust & Wealth Management [Member] | Inter-Segment Eliminations [Member]
Segment Reporting Information [Line Items]
Interest income	1,447,000	1,421,000
Noninterest income	18,000	26,000
Total revenue	1,465,000	1,447,000
Interest expense	498,000	500,000
Noninterest expenses	1,170,000	1,152,000
Total expenses	1,668,000	1,652,000
Trust & Wealth Management [Member] | External Customer [Member]
Segment Reporting Information [Line Items]
Total revenue	8,760,000	7,266,000
Total expenses	$5,502,000	$5,086,000

Indemnifications_and_Guarantee1

Indemnifications and Guarantees - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
	Financial_Institution		Transactions
	Transactions
Guarantor Obligations [Line Items]
Provision for losses at the time of sale	$786,000	$2,630,000
Number of unrelated financial institutions	3
Derivative transaction held for guarantee	108		101
Aggregate notional amount	431,100,000		417,900,000
Notional amount maturity period, minimum	1 month
Notional amount maturity period, maximum	11 years
Aggregate market value of swaps to customers	19,600,000		16,500,000
Loss liabilities established for swap guarantees	0
Secondary Market Loan Sales [Member]
Guarantor Obligations [Line Items]
Provision for losses at the time of sale	$0
Number of loans repurchased	0

Change_in_Accumulated_Other_Co2

Change in Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Income (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$3,500	($21,294)
Other comprehensive income before reclassifications	4,552	9,145
Less: Amounts reclassified from accumulated other comprehensive income	-280	-358
Amortization of unrealized gain on securities reclassified to held-to-maturity	-171
Total other comprehensive income	4,101	8,787
Ending Balance	7,601	-12,507
Net Unrealized (Losses) Gains on Investment Securities Available-for-Sale [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	2,653	-20,822
Other comprehensive income before reclassifications	4,567	9,145
Less: Amounts reclassified from accumulated other comprehensive income	-280	-358
Amortization of unrealized gain on securities reclassified to held-to-maturity	-171
Total other comprehensive income	4,116	8,787
Ending Balance	6,769	-12,035
Net Unrealized Losses on Defined Benefit Pension Plan [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	847		-472
Other comprehensive income before reclassifications	-15
Total other comprehensive income	-15
Ending Balance	$832	($472)	($472)

Change_in_Accumulated_Other_Co3

Change in Accumulated Other Comprehensive Income (Loss) - Components of Other Comprehensive Income (Detail) (USD $)	3 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Realized gains on securities transactions	$20,213	$15,894
Income taxes	-7,324	1,017
Amortization of net unrealized gains to income during the period	171	220
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amortization of net unrealized gains to income during the period	-171
Net of tax	94	358
Reclassification out of Accumulated Other Comprehensive Income [Member] | Net Unrealized (Losses) Gains on Investment Securities Available-for-Sale [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Realized gains on securities transactions	451	578
Income taxes	-171	-220
Net of tax	280	358
Reclassification out of Accumulated Other Comprehensive Income [Member] | Net Unrealized Losses on Defined Benefit Pension Plan [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Prior service (credits) costs	-19
Actuarial (gains) losses	-5
Total before tax	-24
Income taxes	-9
Net of tax	($15)

Legal_and_Other_Proceedings_Ad

Legal and Other Proceedings - Additional Information (Detail) (USD $)	0 Months Ended	3 Months Ended
	Nov. 25, 2014	Mar. 31, 2015
Loss Contingencies [Line Items]
Damages for breach of contract	$800,000
Additions to other significant pending legal or other proceedings		0
Minimum [Member]
Loss Contingencies [Line Items]
Reasonably possible losses for loan proceedings		0
Maximum [Member]
Loss Contingencies [Line Items]
Reasonably possible losses for loan proceedings		5,000,000
Goldstein Case [Member]
Loss Contingencies [Line Items]
Disputed amount		$5,000,000

Subsequent_Events_Additional_I

Subsequent Events - Additional Information (Detail)	0 Months Ended
	Mar. 17, 2015
Subsequent Events [Abstract]
Stock dividend declared date	17-Mar-15
Stock split description	Board of Directors declared a three-for-one stock split in our common stock in the form of a stock dividend of two shares for each issued and outstanding share of common stock.
Stock split conversion ratio	3
Stock dividend to be paid date	18-May-15
Stock dividend record date	4-May-15
Number of shares as stock dividend	2

Subsequent_Events_Pro_Forma_Ef

Subsequent Events - Pro Forma Effect on Share Amounts (Detail)	Mar. 31, 2015	Dec. 31, 2014
Pro Forma Effect on Share Amounts [Line Items]
Shares authorized	20,000,000	20,000,000
Shares issued	18,596,981	18,565,708
Treasury stock	9,174,735	9,163,096
Pro Forma [Member]
Pro Forma Effect on Share Amounts [Line Items]
Shares authorized	65,000,000	65,000,000
Shares issued	37,441,473	37,370,932
Treasury stock	9,174,735	9,163,096

Subsequent_Events_Pro_Forma_Co

Subsequent Events - Pro Forma Computation of Basic and Diluted Earnings Per Share (Detail) (USD $)	3 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014
Numerator:
Net Income	$12,889	$16,911
Earnings per share:
Outstanding common stock equivalents having no dilutive effect	79	44
Pro Forma [Member]
Numerator:
Net Income	$12,889	$16,911
Denominator:
Weighted average basic share	28,218	26,712
Dilutive potential common shares	534	672
Weighted average fully dilutive shares	28,752	27,384
Earnings per share:
Basic	$0.46	$0.63
Diluted	$0.45	$0.62
Outstanding common stock equivalents having no dilutive effect	237	132