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Junior Subordinated Interest Deferrable Debentures (Details 2) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2011
Trust VI
Dec. 31, 2011
Trust VII
Dec. 31, 2011
Trust VIII
Dec. 31, 2011
Trust IX
Dec. 31, 2011
Trust X
Y
Dec. 31, 2011
Trust XI
Y
Dec. 31, 2011
Trust XII
Y
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)     3.91% 3.68% 3.45% 1.99% 6.66% 6.82% 6.85%
Interest rate index     LIBOR LIBOR LIBOR LIBOR FIXED for first 5 years FIXED for first 5 years FIXED for first 5 years
Spread on interest rate index (as a percent)     3.45% 3.25% 3.05% 1.62%      
Interest rate index, reference rate, after five years             LIBOR LIBOR LIBOR
Interest rate index, percentage on reference rate, after five years             1.65% 1.62% 1.45%
Initial period of accrual of interest at fixed rate (in years)             5 5 5