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Junior Subordinated Deferrable Interest Debentures (Details 2) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Trust VI
Dec. 31, 2012
Trust VII
Dec. 31, 2012
Trust VIII
Dec. 31, 2012
Trust IX
Dec. 31, 2012
Trust X
Dec. 31, 2012
Trust XI
Dec. 31, 2012
Trust XII
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)     3.76% 3.56% 3.39% 1.98% 1.96% 1.98% 1.76%
Interest rate index     LIBOR LIBOR LIBOR LIBOR LIBOR LIBOR LIBOR
Spread on interest rate index (as a percent)     3.45% 3.25% 3.05% 1.62% 1.65% 1.62% 1.45%