Name:	ffbh_InterestBearingTimeDepositsInBanks
Namespace Prefix:	ffbh_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

Amount of interest bearing time deposits held by other institutions with maturities greater than three years, but four years or less.

No definition available.

Name:	ffbh_InterestBearingTimeDepositsInBanksMaturitiesYearFour
Namespace Prefix:	ffbh_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount of interest bearing time deposits held by other institutions maturing in the next fiscal year following the latest fiscal year.

No definition available.

Name:	ffbh_InterestBearingTimeDepositsInBanksMaturitiesYearOne
Namespace Prefix:	ffbh_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount of interest bearing time deposits held by other institutions with maturities greater than two years, but three years or less.

No definition available.

Name:	ffbh_InterestBearingTimeDepositsInBanksMaturitiesYearThree
Namespace Prefix:	ffbh_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount of interest bearing time deposits held by other institutions with maturities greater than one year, but two years or less.

No definition available.

Name:	ffbh_InterestBearingTimeDepositsInBanksMaturitiesYearTwo
Namespace Prefix:	ffbh_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

No authoritative reference available.

No definition available.

Name:	ffbh_InterestBearingTimeDepositsInBanksWeightedAverageInterestRate
Namespace Prefix:	ffbh_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Weighted average interest rate for interest bearing time deposits held by other institutions with maturities greater than three years, but four years or less.

No definition available.

Name:	ffbh_InterestBearingTimeDepositsInBanksWeightedAverageInterestRateMaturitiesYearFour
Namespace Prefix:	ffbh_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Weighted average interest rate for interest bearing time deposits held by other institutions with maturities of one year or less.

No definition available.

Name:	ffbh_InterestBearingTimeDepositsInBanksWeightedAverageInterestRateMaturitiesYearOne
Namespace Prefix:	ffbh_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Weighted average interest rate for interest bearing time deposits held by other institutions with maturities greater than two years, but three years or less.

No definition available.

Name:	ffbh_InterestBearingTimeDepositsInBanksWeightedAverageInterestRateMaturitiesYearThree
Namespace Prefix:	ffbh_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

Weighted average interest rate for interest bearing time deposits held by other institutions with maturities greater than one year, but two years or less.

No definition available.