Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Consolidated Statements of Cash Flows
Net earnings	$ 7,448us-gaap_ProfitLoss	$ 7,118us-gaap_ProfitLoss	$ 6,763us-gaap_ProfitLoss
Adjustments to reconcile net earnings to net cash provided by operating activties:
Provision for loan and lease losses	50us-gaap_ProvisionForLoanAndLeaseLosses	400us-gaap_ProvisionForLoanAndLeaseLosses	3,815us-gaap_ProvisionForLoanAndLeaseLosses
Depreciation and amortization	780us-gaap_DepreciationAndAmortization	827us-gaap_DepreciationAndAmortization	837us-gaap_DepreciationAndAmortization
Premium amortization and discount accretion, net	1,548	1,956	2,992
Deferred income tax expense	786us-gaap_DeferredIncomeTaxExpenseBenefit	1,537us-gaap_DeferredIncomeTaxExpenseBenefit	624us-gaap_DeferredIncomeTaxExpenseBenefit
Net loss (gain) on securities available for sale	530us-gaap_GainLossOnInvestments	(651)us-gaap_GainLossOnInvestments	(679)us-gaap_GainLossOnInvestments
Net gain on sale of loans held for sale	(1,163)us-gaap_GainLossOnSaleOfMortgageLoans	(2,030)us-gaap_GainLossOnSaleOfMortgageLoans	(3,430)us-gaap_GainLossOnSaleOfMortgageLoans
Net (gain) loss on other real estate owned	(458)aubn_NetLossGainOnOtherRealEstate	477aubn_NetLossGainOnOtherRealEstate	245aubn_NetLossGainOnOtherRealEstate
Loss on prepayment of long-term debt	0	3,028	3,720
Loans originated for sale	(57,069)	(94,980)	(154,044)
Proceeds from sale of loans	58,089	96,779	156,967
Net gain on disposition of premises and equipment	0	(1,018)	0
Increase in cash surrender value of bank owned life insurance	(501)	(427)	(445)
Gain on sale of affordable housing partnerships investments	0	0	3,268
Net decrease in other assets	(27)	1,232	1,131
Net (decrease) increase in accrued expenses and other liabilities	518	(523)	(166)
Net cash provided by operating activities	10,531	13,725	15,062
Cash flows from investing activities:
Proceeds from sales of securities available-for-sale	37,132	40,251	57,650
Proceeds from maturities of securities available-for-sale	53,767	54,737	112,005
Purchase of securities available-for-sale	(78,278)	(123,449)	(130,352)
(Increase) decrease in loans, net	(20,572)	10,721	(33,456)
Net purchases of premises and equipment	(744)	(462)	(1,549)
Decrease in FHLB stock	235	1,153	2,067
Proceeds from sale of affordable housing limited partnerships	0	0	8,499
Proceeds from sale of premises and equipment	0	1,148	0
Proceeds from sale of other real estate owned	4,480	2,836	4,249
Net cash (used in) provided by investing activities	(3,980)	(13,065)	19,113
Cash flows from financing activities:
Net increase in noninterest-bearing deposits	4,420	7,726	11,738
Net increase (decrease) in interest-bearing deposits	20,126	24,301	5,527
Net increase (decrease) in federal funds purchased and securities sold under agreements to repurchase	1,318	674	(116)
Repayments or retirement of long-term debt	0us-gaap_RepaymentsOfLongTermDebt	(38,028)us-gaap_RepaymentsOfLongTermDebt	(41,816)us-gaap_RepaymentsOfLongTermDebt
Dividends paid	(3,134)us-gaap_PaymentsOfOrdinaryDividends	(3,060)us-gaap_PaymentsOfOrdinaryDividends	(2,987)us-gaap_PaymentsOfOrdinaryDividends
Net cash provided by (used in) financing activities	22,730	(8,387)	(27,654)
Net change in cash and cash equivalents	29,281	(7,727)	6,521
Cash and cash equivalents at beginning of period	54,222	61,949	55,428
Cash and cash equivalents at end of period	83,503	54,222	61,949
Supplemental disclosures of cash flow information:
Interest	5,406us-gaap_InterestPaid	6,761us-gaap_InterestPaid	8,535us-gaap_InterestPaid
Income taxes	1,413us-gaap_IncomeTaxesPaidNet	758us-gaap_IncomeTaxesPaidNet	1,224us-gaap_IncomeTaxesPaidNet
Supplemental disclosure of non-cash transactions:
Real estate acquired through foreclosure	$ 475us-gaap_TransferOfOtherRealEstate	$ 2,278us-gaap_TransferOfOtherRealEstate	$ 1,515us-gaap_TransferOfOtherRealEstate

No authoritative reference available.

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Net loss (gain) on real estate forclosed.

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The sum of the periodic adjustments of the differences between securities' face values and purchase prices that are charged against earnings. This is called accretion if the security was purchased at a discount and amortization if it was purchased at premium. As a noncash item, this element is an adjustment to net income when calculating cash provided by or used in operations using the indirect method.

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Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate changes.

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Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

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The gains (losses) included in earnings that represent the difference between the sale price and the carrying value of loans made to finance real estate acquisitions. This element refers to the gain (loss) and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

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Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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The increase (decrease) during the reporting period in the aggregate amount of liabilities that result from activities that generate operating income.

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The amount of cash paid for interest during the period.

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The change in cash surrender or contract value during the period which adjusted the amount of premiums paid in determining the expense or income recognized under the contract for the period.

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Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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The increase (decrease) in interest-bearing deposits domestic.

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The amount of cash paid for the origination of mortgages that are held for sale.

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The cash inflow associated with maturities (principal being due), prepayments and calls (requests of early payments) on securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities.

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The cash flow from the funds lent to and (borrowed from) other financial reporting institutions arising from excess or shortfall in reserve deposited at the Federal Reserve Bank to meet legal requirements. This lending and borrowing is usually contracted on an overnight basis at an agreed rate of interest. Also include cash outflow or inflow from investments purchased under the agreement to resell such investment.

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The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

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The cash inflow from the sale assets received in full or partial satisfaction of a receivable including real and personal property; equity interests in corporations, partnerships, and joint ventures; and beneficial interests in trusts. Foreclosed assets also include loans that are treated as if the underlying collateral had been foreclosed because the institution has taken possession of the collateral, even though legal foreclosure or repossession proceedings have not taken place.

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The cash inflow from sales of loans that are secured with real estate mortgages and are held with the intention to resell in the near future.

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The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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Amount of expense related to estimated loss from loan and lease transactions.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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Value transferred out of real estate owned (REO) in noncash transactions.

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