CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 4,361us-gaap_NetIncomeLoss	$ 3,057us-gaap_NetIncomeLoss	$ 3,207us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for loan and lease losses	(541)us-gaap_ProvisionForLoanAndLeaseLosses	200us-gaap_ProvisionForLoanAndLeaseLosses	1,365us-gaap_ProvisionForLoanAndLeaseLosses
(Decrease) increase in deferred loan and lease origination fees, net	(26)	83	(72)
Depreciation and amortization	438	518	784
Amortization of investment security premiums and discounts, net	4,647	5,774	4,333
Gain on sale and call of investment securities	(208)	(36)	(93)
Increase in cash surrender value of life insurance policies	(284)	(247)	(266)
Gain on life insurance death benefit	(99)amrb_GainOnLifeInsuranceDeathBenefit1	(118)amrb_GainOnLifeInsuranceDeathBenefit1	0amrb_GainOnLifeInsuranceDeathBenefit1
(Benefit from) provision for deferred income taxes	(74)us-gaap_DeferredIncomeTaxExpenseBenefit	244us-gaap_DeferredIncomeTaxExpenseBenefit	454us-gaap_DeferredIncomeTaxExpenseBenefit
Stock-based compensation expense	166us-gaap_ShareBasedCompensation	131us-gaap_ShareBasedCompensation	155us-gaap_ShareBasedCompensation
(Gain) loss on sale or write-down of other real estate owned	(66)	116	1,571
Decrease in accrued interest receivable and other assets	298	1,821	128
Increase (decrease) in accrued interest payable and other liabilities	371	(96)	5
Net cash provided by operating activities	8,983	11,447	11,571
Cash flows from investing activities:
Proceeds from the sale of available-for-sale investment securities	23,804	8,851	15,567
Proceeds from called available-for-sale investment securities	1,160	590	195
Proceeds from matured available-for-sale investment securities	105	905	825
Purchases of available-for-sale investment securities	(83,049)	(119,972)	(96,475)
Proceeds from principal repayments for available-for-sale mortgage-backed securities	41,014	57,664	53,727
Proceeds from principal repayments for held-to-maturity mortgage-backed securities	324	934	1,898
Purchases of bank owned life insurance	(1,350)amrb_PurchasesOfBankOwnedLifeInsurance	0amrb_PurchasesOfBankOwnedLifeInsurance	(1,300)amrb_PurchasesOfBankOwnedLifeInsurance
Net (increase) decrease in interest-bearing deposits in banks	0	(250)	500
Net (increase) decrease in loans and leases	(5,932)us-gaap_IncreaseDecreaseInOtherLoans	(1,741)us-gaap_IncreaseDecreaseInOtherLoans	31,066us-gaap_IncreaseDecreaseInOtherLoans
Net proceeds from sale of other real estate owned	2,283	7,516	3,637
Death benefit from life insurance policy	252	419	0
Capitalized additions to other real estate	(54)	(186)	0
Purchases of equipment	(456)	(130)	(134)
Net (increase) decrease in FHLB stock	(438)	6	(161)
Net cash (used in) provided by investing activities	(22,337)	(45,394)	9,345
Cash flows from financing activities:
Net increase in demand, interest-bearing and savings deposits	31,545us-gaap_IncreaseDecreaseInDeposits	10,185us-gaap_IncreaseDecreaseInDeposits	16,713us-gaap_IncreaseDecreaseInDeposits
Net decrease in time deposits	(4,542)us-gaap_IncreaseDecreaseInTimeDeposits	(4,751)us-gaap_IncreaseDecreaseInTimeDeposits	(742)us-gaap_IncreaseDecreaseInTimeDeposits
Cash paid to repurchase common stock	(4,148)	(7,000)	(4,194)
(Decrease) increase in long-term borrowings	(500)	(8,000)	2,000
(Decrease) increase in short-term borrowings	(4,500)	6,000	(3,000)
Net cash provided by (used in) financing activities	17,855	(3,566)	10,777
Increase (decrease) in cash and cash equivalents	4,501	(37,513)	31,693
Cash and cash equivalents at beginning of year	17,948	55,461	23,768
Cash and cash equivalents at end of year	22,449	17,948	55,461
Cash paid during the year for:
Interest expense	1,234us-gaap_InterestPaid	1,527us-gaap_InterestPaid	1,958us-gaap_InterestPaid
Income taxes	2,415us-gaap_IncomeTaxesPaid	1,575us-gaap_IncomeTaxesPaid	1,395us-gaap_IncomeTaxesPaid
Non-cash investing activities:
Real estate acquired through foreclosure	$ 189	$ 1,829	$ 9,388

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Period Type:	duration

- Definition

The cash outflow to reacquire common stock during the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

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- Definition

The cash outflow associated with the purchase of other real estate investments held by the entity for investment purposes not otherwise defined in the taxonomy.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585

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- Definition

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

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- Definition

The cash inflow for proceeds from life insurance policies for which the entity is the beneficiary.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

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- Definition

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.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (a),(b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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- Definition

The cash inflow associated with the maturity, prepayments and calls (requests for early payments) of debt securities designated as held-to-maturity.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 45

-Paragraph 11

-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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- Definition

The cash inflow from repayments of the balance excluding interest (principal) on loans receivable and leases held for investment purposes.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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- Definition

Amount of cash inflow (outflow) from other long-term debt.

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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- Definition

The net cash inflow or outflow for borrowing having initial term of repayment within one year or the normal operating cycle, if longer.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 9

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3098-108585

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- Definition

The cash inflow associated with the sale or maturity (principal being due) of securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities.

+ References

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Data Type:	xbrli:monetaryItemType
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- Definition

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

+ References

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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- Definition

The cash inflow associated with the sale of other real estate not otherwise defined in the taxonomy.

+ References

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Data Type:	xbrli:monetaryItemType
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Period Type:	duration

- Definition

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

+ References

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- Definition

Amount of real estate investments acquired through foreclosure for entities with a substantial portion of business acquiring and holding investment real estate.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 10

-Section S99

-Paragraph 6

-Subparagraph (SX 210.5-04.(c) Schedule III)

-URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 28

-Article 12

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph c

-Subparagraph Schedule III

-Article 5

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 970

-SubTopic 360

-Section S99

-Paragraph 1

-Subparagraph (SX 210.12-28.4)

-URI http://asc.fasb.org/extlink&oid=6590653&loc=d3e638233-123024

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

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