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Junior Subordinated Interest Deferrable Debentures (Details 2) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Sep. 30, 2014
Trust Six [Member]
Sep. 30, 2014
Trust Eight [Member]
Sep. 30, 2014
Trust Nine [Member]
Sep. 30, 2014
Trust Ten [Member]
Sep. 30, 2014
Trust Eleven [Member]
Sep. 30, 2014
Trust Twelve [Member]
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)     3.68% 3.28% 1.85% 1.89% 1.85% 1.68%
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%