Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Schedule of the notional amount of off-balance sheet financial instruments
Loans in process and commitments	$ 15,247	$ 16,728
Interest rate swaps [Member]
Schedule of the notional amount of off-balance sheet financial instruments
Letters of credit	35,000	35,000
Interest rate caps [Member]
Schedule of the notional amount of off-balance sheet financial instruments
Letters of credit	170,000	200,000
Standby [Member]
Schedule of the notional amount of off-balance sheet financial instruments
Letters of credit	15,423	14,461
Commercial [Member]
Schedule of the notional amount of off-balance sheet financial instruments
Lines of credit (unfunded)	21,544	22,312
Consumer [Member]
Schedule of the notional amount of off-balance sheet financial instruments
Lines of credit (unfunded)	51,375	51,145
Fixed interest rate [Member]
Schedule of the notional amount of off-balance sheet financial instruments
Loans in process and commitments	18,732	25,487
Variable interest rate [Member]
Schedule of the notional amount of off-balance sheet financial instruments
Loans in process and commitments	$ 13,617	$ 16,585

Name:	esbf_ScheduleOfOffBalanceSheetFinancialInstrumentsAbstract
Namespace Prefix:	esbf_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount borrowed under the credit facility as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 22

-Article 5

+ Details

Name:	us-gaap_LineOfCreditFacilityAmountOutstanding
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of undisbursed portion of the loan receivable balance (loans in process). Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher OTS

-Name Federal Regulation (FR)

-Number Title 12

-Section 563c.102

-Paragraph 8

-Subparagraph g

-Chapter V

-Subsection I

-LegacyDoc This is a non-GAAP reference that was included in the 2009 taxonomy. It will be removed from future versions of this taxonomy.

+ Details

Name:	us-gaap_LoansAndLeasesReceivableLoansInProcess
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant