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Investment Securities (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Held-to-maturity Securities [Line Items]    
Carrying value $ 0us-gaap_HeldToMaturitySecurities $ 14,798us-gaap_HeldToMaturitySecurities
Cost or amortized cost 0us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment 14,798us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment
Fair value 0us-gaap_HeldToMaturitySecuritiesFairValue 14,798us-gaap_HeldToMaturitySecuritiesFairValue
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Carrying Value 0abcp_TradingSecuritiesCarryingValue 0abcp_TradingSecuritiesCarryingValue
Cost or amortized cost 0us-gaap_TradingSecuritiesCost 0us-gaap_TradingSecuritiesCost
Fair Value 0us-gaap_TradingSecurities 0us-gaap_TradingSecurities
Gross unrealized gains (losses) on investment securities held to maturity [Abstract]    
Gross unrealized gains (losses) 0us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingGains 0us-gaap_HeldToMaturitySecuritiesUnrecognizedHoldingGains
Realized gains (losses) on investment securities [Abstract]    
Net sale proceeds 956abcp_ProceedsFromSaleOfTradingSecurities 817abcp_ProceedsFromSaleOfTradingSecurities
Less: Cost basis 936abcp_TradingSecuritiesRealizedGainsInvestmentSecuritiesCostBasis 778abcp_TradingSecuritiesRealizedGainsInvestmentSecuritiesCostBasis
Realized gains (losses) 20us-gaap_TradingSecuritiesRealizedGainLoss 39us-gaap_TradingSecuritiesRealizedGainLoss
Unrealized gains (losses) on investment securities [Abstract]    
Cost basis 0us-gaap_TradingSecuritiesCost 0us-gaap_TradingSecuritiesCost
Current value 0us-gaap_TradingSecurities 0us-gaap_TradingSecurities
Equity Securities [Member]    
Schedule of Trading Securities and Other Trading Assets [Line Items]    
Carrying Value 0abcp_TradingSecuritiesCarryingValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
0abcp_TradingSecuritiesCarryingValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
Cost or amortized cost 0us-gaap_TradingSecuritiesCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
0us-gaap_TradingSecuritiesCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
Fair Value 0us-gaap_TradingSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
0us-gaap_TradingSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
Unrealized gains (losses) on investment securities [Abstract]    
Cost basis 0us-gaap_TradingSecuritiesCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
0us-gaap_TradingSecuritiesCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
Current value 0us-gaap_TradingSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
0us-gaap_TradingSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_EquitySecuritiesMember
US Treasury Bills [Member]    
Held-to-maturity Securities [Line Items]    
Carrying value 0us-gaap_HeldToMaturitySecurities
/ us-gaap_DebtSecurityAxis
= us-gaap_USTreasurySecuritiesMember
14,798us-gaap_HeldToMaturitySecurities
/ us-gaap_DebtSecurityAxis
= us-gaap_USTreasurySecuritiesMember
Cost or amortized cost 0us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment
/ us-gaap_DebtSecurityAxis
= us-gaap_USTreasurySecuritiesMember
14,798us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment
/ us-gaap_DebtSecurityAxis
= us-gaap_USTreasurySecuritiesMember
Fair value $ 0us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_USTreasurySecuritiesMember
$ 14,798us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_DebtSecurityAxis
= us-gaap_USTreasurySecuritiesMember