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Junior Subordinated Interest Deferrable Debentures (Details 2) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2014
Trust VI
Mar. 31, 2014
Trust VIII
Mar. 31, 2014
Trust IX
Mar. 31, 2014
Trust X
Mar. 31, 2014
Trust XI
Mar. 31, 2014
Trust XII
Junior subordinated deferrable interest debentures, major types of business trusts                
Junior subordinated deferrable interest debentures $ 180,416 $ 190,726 $ 25,774 $ 25,774 $ 41,238 $ 34,021 $ 32,990 $ 20,619
Interest rate (as a percent)     3.69% 3.29% 1.87% 1.89% 1.87% 1.69%
Interest rate index     LIBOR LIBOR LIBOR LIBOR LIBOR LIBOR
Spread on interest rate index (as a percent)     3.45% 3.05% 1.62% 1.65% 1.62% 1.45%