XML 27 R16.htm IDEA: XBRL DOCUMENT v3.21.1

Securities (Tables)	3 Months Ended
	Mar. 31, 2021
Investments debt and equity securities [Abstract]
Available-for-sale Securities [Table Text Block]	1 year 1 to 5 5 to 10 After 10 Fair Gross Unrealized  Amortized (Dollars in thousands) or less years years years Value Gains Losses Cost March 31, 2021 Agency obligations (a) $ 10,115 26,208 57,435 11,424 105,182 1,734 1,782 $ 105,230 Agency MBS (a) — 1,021 27,745 153,740 182,506 2,405 1,970 182,071 State and political subdivisions 381 632 10,442 60,487 71,942 3,354 448 69,036 Total available-for-sale $ 10,496 27,861 95,622 225,651 359,630 7,493 4,200 $ 356,337 December 31, 2020 Agency obligations (a) $ 5,048 24,834 55,367 12,199 97,448 3,156 98 $ 94,390 Agency MBS (a) — 1,154 20,502 141,814 163,470 3,245 133 160,358 State and political subdivisions 477 632 8,405 64,745 74,259 3,988 11 70,282 Total available-for-sale $ 5,525 26,620 84,274 218,758 335,177 10,389 242 $ 325,030 (a) Includes securities issued by U.S. government agencies or government-sponsored entities.
Available-for-sale Securities, Continuous Unrealized Loss Position [Table Text Block]	Less than 12 Months 12 Months or Longer Total Fair Unrealized Fair Unrealized Fair Unrealized (Dollars in thousands) Value Losses Value Losses Value Losses March 31, 2021: Agency obligations  $ 50,357 1,782 — — $ 50,357 1,782 Agency MBS 91,931 1,970 — — 91,931 1,970 State and political subdivisions 10,750 448 — — 10,750 448 Total  $ 153,038 4,200 — — $ 153,038 4,200 December 31, 2020: Agency obligations  $ 15,416 98 — — $ 15,416 98 Agency MBS 41,488 133 — — 41,488 133 State and political subdivisions 2,945 11 — — 2,945 11 Total  $ 59,849 242 — — $ 59,849 242
Schedule of Realized Gain (Loss) [Table Text Block]	Realized Gains and Losses The following table presents the gross realized gains and losses on sales of securities. Quarter ended March 31, (Dollars in thousands) 2021 2020 Gross realized gains $ — $ 6 Gross realized losses — — Realized gains, net $ — $ 6

X

- References

No definition available.

+ Details

Name:	aubn_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTableTextBlock
Namespace Prefix:	aubn_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

+ References

No definition available.

+ Details

Name:	us-gaap_AvailableForSaleSecuritiesTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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

X

- Definition

Tabular disclosure of the proceeds from sales of available-for-sale securities and the gross realized gains and gross realized losses that have been included in earnings as a result of those sales.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27357-111563

+ Details

Name:	us-gaap_ScheduleOfRealizedGainLossTableTextBlock
Namespace Prefix:	us-gaap_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration