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Summary of Significant Accounting Policies - Basic and Diluted Shares Outstanding (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Accounting Policies [Abstract]
Weighted average common shares outstanding - Basic	20,772us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	20,364us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	19,649us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive options (in shares)	49us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment	37us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment	51us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Weighted average common shares outstanding - Diluted	20,821us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	20,401us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	19,700us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Average share price (in usd per share)	$ 49.09bfs_AveragePricePerCommonShare	$ 45.44bfs_AveragePricePerCommonShare	$ 40.94bfs_AveragePricePerCommonShare

X

- Definition

Average Price Per Common Share

+ References

No definition available.

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- Definition

The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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- Definition

The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 45

-Paragraph 16

-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1505-109256

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- Definition

Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 45

-Paragraph 10

-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1448-109256



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Weighted-Average Number of Common Shares Outstanding

-URI http://asc.fasb.org/extlink&oid=6528421

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