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Junior Subordinated Interest Deferrable Debentures (Details 2) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2011
Dec. 31, 2010
Sep. 30, 2011
Trust VI
Sep. 30, 2011
Trust VII
Sep. 30, 2011
Trust VIII
Sep. 30, 2011
Trust IX
year
Sep. 30, 2011
Trust X
year
Sep. 30, 2011
Trust XI
year
Sep. 30, 2011
Trust XII
year
Junior subordinated deferrable interest debentures, major types of business trusts         
Junior subordinated deferrable interest debentures$ 190,726$ 201,117$ 25,774$ 10,310$ 25,774$ 41,238$ 34,021$ 32,990$ 20,619
Interest rate (as a percent)  3.74%3.50%3.30%7.10%6.66%6.82%6.85%
Interest rate index  LIBOR LIBOR LIBOR FIXED for first 5 yearsFIXED for first 5 yearsFIXED for first 5 yearsFIXED for first 5 years
Spread on interest rate index (as a percent)  3.45%3.25%3.05%    
Interest rate index, reference rate, after five years     LIBOR LIBOR LIBOR LIBOR
Interest rate index, percentage on reference rate, after five years (as a percent)     1.62%1.65%1.62%1.45%
Initial period of accrual of interest at fixed rate (in years)     5555