v2.4.0.6

Trust Preferred Securities (Parenthetical) (Detail) | Sep. 30, 2012
--- | ---
Three Month LIBOR | After tenth anniversary in 2015 |
Debt Instrument [Line Items] |
Debt instrument interest rate, margin | 3.40%
LIBOR | After fifth anniversary in 2011 |
Debt Instrument [Line Items] |
Debt instrument interest rate, margin | 3.30%
LIBOR | After fifth anniversary in 2012 |
Debt Instrument [Line Items] |
Debt instrument interest rate, margin | 3.00%

X
- Definition The percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentBasisSpreadOnVariableRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration