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Securities (Narrative) (Details)	Mar. 31, 2015 security
Number Of Securities Evaluated For Other Than Temporary Impairment [Line Items]
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US Agency Obligations [Member]
Number Of Securities Evaluated For Other Than Temporary Impairment [Line Items]
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Municipals [Member]
Number Of Securities Evaluated For Other Than Temporary Impairment [Line Items]
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S&P Rated AAA [Member]
Number Of Securities Evaluated For Other Than Temporary Impairment [Line Items]
Securities evaluated for other than temporary impairment	1botj_NumberOfSecuritiesEvaluatedForOtherThanTemporaryImpairment / us-gaap_CreditRatingStandardPoorsAxis = us-gaap_StandardPoorsAAARatingMember
S&P Rated AA [Member]
Number Of Securities Evaluated For Other Than Temporary Impairment [Line Items]
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