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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (USD $)
In Thousands, except Share data
Common Stock
Retained Earnings
Accumulated Other Comprehensive Income (Net of Taxes)
Total
Beginning Balance, Amount at Dec. 31, 2011 $ 72,016us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ 18,525us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
$ 3,558us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
$ 94,099us-gaap_StockholdersEquity
Beginning Balance, Shares at Dec. 31, 2011 9,890,909us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Net income    3,207amrb_NetIncome
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
   3,207amrb_NetIncome
Net change in unrealized gains on available-for-sale investment securities (Note 5)       727us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
727us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
Net restricted stock award activity and related compensation expense, Shares 11,683us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Net restricted stock award activity and related compensation expense, Amount 110amrb_NetRestrictedStockAwardActivityAndRelatedCompensationExpenseAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
      110amrb_NetRestrictedStockAwardActivityAndRelatedCompensationExpenseAmount
Retirement of common stock (Note 13), Shares (575,389)us-gaap_StockRepurchasedAndRetiredDuringPeriodShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Retirement of common stock (Note 13), Amount (4,194)amrb_RetirementOfCommonStockAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
      (4,194)amrb_RetirementOfCommonStockAmount
Stock option compensation expense 45us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
      45us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition
Ending Balance, Amount at Dec. 31, 2012 67,977us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
21,732us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
4,285us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
93,994us-gaap_StockholdersEquity
Ending Balance, Shares at Dec. 31, 2012 9,327,203us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Net income    3,057amrb_NetIncome
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
   3,057amrb_NetIncome
Net change in unrealized gains on available-for-sale investment securities (Note 5)       (3,162)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
(3,162)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
Net restricted stock award activity and related compensation expense, Shares 11,448us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Net restricted stock award activity and related compensation expense, Amount 111amrb_NetRestrictedStockAwardActivityAndRelatedCompensationExpenseAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
      111amrb_NetRestrictedStockAwardActivityAndRelatedCompensationExpenseAmount
Retirement of common stock (Note 13), Shares (849,404)us-gaap_StockRepurchasedAndRetiredDuringPeriodShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Retirement of common stock (Note 13), Amount (7,000)amrb_RetirementOfCommonStockAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
      (7,000)amrb_RetirementOfCommonStockAmount
Stock option compensation expense 20us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
      20us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition
Ending Balance, Amount at Dec. 31, 2013 61,108us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
24,789us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
1,123us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
 
Ending Balance, Shares at Dec. 31, 2013 8,489,247us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Net income    4,361amrb_NetIncome
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
   4,361amrb_NetIncome
Net change in unrealized gains on available-for-sale investment securities (Note 5)       2,248us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
2,248us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
Net restricted stock award activity and related compensation expense, Shares 24,830us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Net restricted stock award activity and related compensation expense, Amount 147amrb_NetRestrictedStockAwardActivityAndRelatedCompensationExpenseAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
      147amrb_NetRestrictedStockAwardActivityAndRelatedCompensationExpenseAmount
Retirement of common stock (Note 13), Shares (424,462)us-gaap_StockRepurchasedAndRetiredDuringPeriodShares
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
     
Retirement of common stock (Note 13), Amount (4,148)amrb_RetirementOfCommonStockAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
      (4,148)amrb_RetirementOfCommonStockAmount
Stock option compensation expense 19us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
      19us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition
Ending Balance, Amount at Dec. 31, 2014 $ 57,126us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ 29,150us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
$ 3,371us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
$ 89,647us-gaap_StockholdersEquity
Ending Balance, Shares at Dec. 31, 2014 8,089,615us-gaap_SharesOutstanding
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember