Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Consolidated Statements of Cash Flows:
Net earnings	$ 1,862us-gaap_ProfitLoss	$ 1,821us-gaap_ProfitLoss
Adjustments to reconcile net earnings to net cash provided by operating activties:
Provision for loan losses	0us-gaap_ProvisionForLoanAndLeaseLosses	(400)us-gaap_ProvisionForLoanAndLeaseLosses
Depreciation and amortization	242us-gaap_DepreciationAndAmortization	182us-gaap_DepreciationAndAmortization
Premium amortization and discount accretion, net	385	392
Net (gain) loss on securities available-for-sale	(3)us-gaap_GainLossOnInvestments	307us-gaap_GainLossOnInvestments
Net gain on sale of loans held for sale	(258)us-gaap_GainLossOnSaleOfMortgageLoans	(240)us-gaap_GainLossOnSaleOfMortgageLoans
Increase in MSR valuation allowance	10	0
Net loss on other real estate owned	5aubn_NetLossGainOnOtherRealEstate	126aubn_NetLossGainOnOtherRealEstate
Loss on prepayment of long-term debt	362	0
Loans originated for sale	(19,148)	(8,848)
Proceeds from sale of loans	17,720	10,037
Increase in cash surrender value of bank owned life insurance	(125)	(126)
Income recognized from death benefit on bank-owned life insurance	(276)	0
Net decrease in other assets	365	281
Net (decrease) increase in accrued expenses and other liabilities	(365)	45
Net cash provided by operating activities	776	3,577
Cash flows from investing activities:
Proceeds from maturities of securities available-for-sale	7,760	10,119
Purchase of securities available-for-sale	(1,596)	(15,217)
Decrease in loans, net	6,227	5,717
Net purchases of premises and equipment	(230)	0
Proceeds from bank-owned life insurance death benefit	662	0
Decrease in FHLB stock	191	235
Proceeds from sale of other real estate owned	30	762
Net cash provided by investing activities	13,044	1,616
Cash flows from financing activities:
Net increase (decrease) in noninterest-bearing deposits	11,416	(113)
Net (decrease) increase in interest-bearing deposits	(6,470)	18,357
Net decrease in federal funds purchased and securities sold under agreements to repurchase	(332)	(97)
Repayments or retirement of long-term debt	(5,362)us-gaap_RepaymentsOfLongTermDebt	0us-gaap_RepaymentsOfLongTermDebt
Dividends paid	(802)us-gaap_PaymentsOfOrdinaryDividends	(782)us-gaap_PaymentsOfOrdinaryDividends
Net cash (used in) provided by financing activities	(1,550)	17,365
Net change in cash and cash equivalents	12,270	22,558
Cash and cash equivalents at beginning of period	83,503	54,222
Cash and cash equivalents at end of period	95,773	76,780
Supplemental disclosures of cash flow information:
Interest	1,360us-gaap_InterestPaid	1,418us-gaap_InterestPaid
Income taxes	391us-gaap_IncomeTaxesPaidNet	156us-gaap_IncomeTaxesPaidNet
Supplemental disclosure of non-cash transactions:
Real estate acquired through foreclosure	$ 0us-gaap_TransferOfOtherRealEstate	$ 115us-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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The sum of cash and cash equivalents plus Federal Funds Sold. Cash and cash equivalents consist of short term, highly liquid investments that are readily convertible to known amounts of cash and are so near their maturity that they present negligible risk of changes in value due to changes in interest rates -- usually with an original maturity less than 90 days.

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This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting and losses recognized for other than temporary impairments (OTTI) of the subject investments.

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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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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 increase (decrease) during the reporting period in other assets used in operating activities not separately disclosed in the statement of cash flows. May include changes in other current assets, other noncurrent assets, or a combination of other current and noncurrent assets.

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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) of financing activities, excluding 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) of investing activities, excluding 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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Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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

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The increase (decrease) in domestic noninterest bearing deposits.

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

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Amount of cash outflow (inflow) from acquisition (sale) of Federal Home Loan Bank (FHLBank) stock.

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The net cash outflow or inflow from purchases, sales and disposals of property, plant and equipment and other productive assets, including intangibles.

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Cash outflow in the form of ordinary dividends to common shareholders, preferred shareholders and noncontrolling interests, generally out of earnings.

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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 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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