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Junior Subordinated Debt (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2011
Apr. 07, 2006
Dec. 31, 2016
Jul. 01, 2011
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]        
Proceeds from issuance of trust preferred securities   $ 20,000    
Number of consecutive quarterly periods for deferral of distributions on Trust Preferred Securities 5 years      
Proceeds from issuance of common securities $ 619      
Junior subordinated debenture $ 20,619      
Mid Carolina Trust        
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]        
Junior subordinated debenture       $ 8,764
Equity method investments     $ 264  
AMNB Trust I        
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]        
Equity method investments     $ 619  
Trust Preferred Securities        
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]        
Maturity Date     Jun. 30, 2036  
Fixed interest rate of trust preferred securities   6.66%    
Reference rate, trust preferred securities     three-month LIBOR  
Trust preferred securities, basis spread on variable rate 1.35%