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Component: (Network and Table)
Network
2419403 - Disclosure - Fair Value Measurements - Summary of Fair Value Measurements Using Unobservable Inputs (Level 3) (Details)
(http://amnb.com/role/FairValueMeasurementsSummaryOfFairValueMeasurementsUsingUnobservableInputsLevel3Details)
TableFair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table]
Slicers (applies to each fact value in each table cell)
Reporting Entity [Axis]0000741516 (http://www.sec.gov/CIK)
Fair Value, Hierarchy [Axis]Level 3
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]Period [Axis]
2016-01-01 - 2016-12-31
Major Types of Debt and Equity Securities [Axis]
Equity securitiesMajor Types of Debt and Equity Securities [Domain]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
 
 
Beginning Balances
1,486,000  
1,486,000  
Total Realized / Unrealized Gains (Losses) Included in Net Income
0  
0  
Total Realized / Unrealized Gains (Losses) Included in Other Comprehensive Income
93,000  
93,000  
Purchases, Sales, Issuances and Settlements, Net
0  
0  
Transfer In (Out) of Level 3
(1,579,000) 
(1,579,000) 
Ending Balances
0  
 
0