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Junior Subordinated Interest Deferrable Debentures (Details 2) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2011
Dec. 31, 2010
Jun. 30, 2011
Trust VI
Jun. 30, 2011
Trust VII
Jun. 30, 2011
Trust VIII
Jun. 30, 2011
Trust IX
Jun. 30, 2011
Trust X
Jun. 30, 2011
Trust XI
Jun. 30, 2011
Trust XII
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)     3.71% 3.52% 3.33% 7.10% 6.66% 6.82% 6.85%
Interest rate index     LIBOR LIBOR LIBOR FIXED for first 5 years 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%        
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)           5 5 5 5