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Junior Subordinated Interest Deferrable Debentures (Details 2) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2012
Trust VI
Jun. 30, 2012
Trust VII
Jun. 30, 2012
Trust VIII
Jun. 30, 2012
Trust IX
Jun. 30, 2012
Trust X
Jun. 30, 2012
Trust XI
Jun. 30, 2012
Trust XII
Y
Junior subordinated deferrable interest debentures, major types of business trusts                  
Junior subordinated deferrable interest debentures $ 190,726 $ 190,726 $ 25,774 $ 10,310 $ 25,774 $ 41,238 $ 34,021 $ 32,990 $ 20,619
Interest rate (as a percent)     3.92% 3.72% 3.52% 2.09% 2.12% 2.08% 6.85%
Interest rate index     LIBOR LIBOR LIBOR LIBOR LIBOR LIBOR FIXED for first 5 years
Spread on interest rate index (as a percent)     3.45% 3.25% 3.05% 1.62% 1.65% 1.62%  
Interest rate index, reference rate, after five years                 LIBOR
Interest rate index, percentage on reference rate, after five years                 1.45%
Initial period of accrual of interest at fixed rate (in years)                 5