Loans Held for Investment, net - Residential and Consumer Gross Loans Based on Accrual Status, Additional Information (Detail)	12 Months Ended
Dec. 31, 2015
Receivables [Abstract]
Period of education loans	90 days
Guarantee provided by government agencies against outstanding balances of education loans	97.00%

Guarantee provided by government agencies against outstanding balances of education loans.

No definition available.

Name:	abcw_GuaranteeProvidedByGovernmentAgenciesAgainstOutstandingBalancesOfEducationLoans
Namespace Prefix:	abcw_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration