Trust Preferred Capital Notes (Details) $ in Thousands		1 Months Ended	6 Months Ended
	Apr. 07, 2006 USD ($)	Sep. 30, 2011	Jun. 30, 2015 USD ($) quarter	Jul. 01, 2011 USD ($) trust
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 (up to 20 quarterly periods) | quarter			20
Principal Amount			$ 20,619
Proceeds from issuance of common securities			$ 619
Trust Preferred Securities [Member]
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Fixed interest rate			6.66%
Mid Carolina Trust [Member]
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Principal Amount				$ 8,764
Number of Trusts | trust				2
LIBOR [Member] | Trust Preferred Securities [Member]
Financial Instruments Subject to Mandatory Redemption by Settlement Terms [Line Items]
Basis Spread on Variable Rate		1.35%
AMNB Statutory Trust I [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investments			$ 619
Mid Carolina Trust [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investments			$ 264