Increase (decrease) in nonaccrual loans.

No definition available.

Name:	bylk_IncreaseDecreaseInNonaccrualLoans
Namespace Prefix:	bylk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Nonperforming loans.

+ References

No definition available.

+ Details

Name:	bylk_NonperformingLoans
Namespace Prefix:	bylk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Troubled debt restructuring, payment schedule changes.

+ References

No definition available.

+ Details

Name:	bylk_TroubledDebtRestructuringPaymentScheduleChanges
Namespace Prefix:	bylk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of direct write-downs of financing receivables charged against the allowance.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 11B

-Subparagraph (c)(3)

-URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953423-111524

+ Details

Name:	us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_FinancingReceivableModificationsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 33

-URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953676-111524

+ Details

Name:	us-gaap_FinancingReceivableModificationsNumberOfContracts2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 40

-Section 50

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554

+ Details

Name:	us-gaap_FinancingReceivableModificationsRecordedInvestment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Reflects the carrying amount of loans deemed to be questionable as to collection on which no interest is continuing to be recognized.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 7

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5111-111524

+ Details

Name:	us-gaap_LoansAndLeasesReceivableImpairedNonperformingNonaccrualOfInterest
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The cash inflow from repayments of the balance excluding interest (principal) on loans receivable and leases held for investment purposes.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

+ Details

Name:	us-gaap_ProceedsFromPrincipalRepaymentsOnLoansAndLeasesHeldForInvestment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_FinancingReceivableTroubledDebtRestructuringAxis=bylk_AccruingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableTroubledDebtRestructuringAxis=bylk_NonaccrualMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancingReceivableTroubledDebtRestructuringAxis=bylk_SingleLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Allowance For Loan Losses ("ALL") (Schedule Of Nonperforming Loans) (Details) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2015 contract	Dec. 31, 2014 contract	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014
Financing Receivable, Modifications [Line Items]
Restructured loans	$ 6,907,000	$ 8,656,000
Increase (decrease) in nonaccrual loans	1,300,000bylk_IncreaseDecreaseInNonaccrualLoans
Remaining balances charged off	300,000	1,283,000
Number of loans restructured	9	10
Nonaccrual [Member]
Financing Receivable, Modifications [Line Items]
Nonaccrual loans	5,731,000	5,155,000	5,647,000	6,794,000	6,686,000
Restructured loans			256,000	256,000	255,000
Total nonperforming loans ("NPLs")	5,731,000	5,155,000	5,903,000	7,050,000	6,941,000
Payments received	400,000
Remaining balances charged off	300,000
Accruing [Member]
Financing Receivable, Modifications [Line Items]
Restructured loans	6,907,000	8,656,000	8,656,000	8,472,000	8,370,000
Number of loans restructured	1
Restructuring of loans for payment schedule changes	100,000
Single Loan [Member]
Financing Receivable, Modifications [Line Items]
Increase (decrease) in nonaccrual loans	$ 1,100,000