Trust Preferred Securities and Junior Subordinated Debentures	12 Months Ended
Dec. 31, 2011
Trust Preferred Securities and Junior Subordinated Debentures Disclosure [Abstract]
Trust Preferred Securities and Junior Subordinated Debentures	(13) Trust Preferred Securities and Junior Subordinated Debentures Washington Banking Capital Trust I, a statutory business trust, was a wholly-owned subsidiary of the Company created for the exclusive purposes of issuing and selling capital securities and utilizing sale proceeds to acquire junior subordinated debt issued by the Company. On June 27, 2002, the Trust issued $15.0 million of trust preferred securities with a 30-year maturity, callable after the fifth year by the Company. On June 29, 2007, the Company called the $15.0 million of trust preferred securities issued. The Trust was subequently closed. Washington Banking Master Trust, a statutory business trust, is a wholly-owned subsidiary of the Company created for the exclusive purposes of issuing and selling capital securities and utilizing sale proceeds to acquire junior subordinated debt issued by the Company. During the second quarter of 2007, the Master Trust issued $25.0 million of trust preferred securities with a 30-year maturity, callable after the fifth year by the Company. The trust perferred secuities have a quarterly adjustable rate based upon the London Interbank Offered Rate (“LIBOR”) plus 1.56%. On December 31, 2011, the rate was 1.91%. The junior subordinated debentures are the sole assets of the Master Trust, and payments under the junior subordinated debentures are the sole revenues of the Trust. All of the common securities of the Master Trust are owned by the Company. Washington Banking Company has fully and unconditionally guaranteed the capital securities along with all obligations of the Master Trust under the trust agreements.

(13) Trust Preferred Securities and Junior Subordinated Debentures

Washington Banking Capital Trust I, a statutory business trust, was a wholly-owned subsidiary of the Company created for the exclusive purposes of issuing and selling capital securities and utilizing sale proceeds to acquire junior subordinated debt issued by the Company. On June 27, 2002, the Trust issued $15.0 million of trust preferred securities with a 30-year maturity, callable after the fifth year by the Company. On June 29, 2007, the Company called the $15.0 million of trust preferred securities issued. The Trust was subequently closed.

Washington Banking Master Trust, a statutory business trust, is a wholly-owned subsidiary of the Company created for the exclusive purposes of issuing and selling capital securities and utilizing sale proceeds to acquire junior subordinated debt issued by the Company. During the second quarter of 2007, the Master Trust issued $25.0 million of trust preferred securities with a 30-year maturity, callable after the fifth year by the Company. The trust perferred secuities have a quarterly adjustable rate based upon the London Interbank Offered Rate (“LIBOR”) plus 1.56%. On December 31, 2011, the rate was 1.91%.

The junior subordinated debentures are the sole assets of the Master Trust, and payments under the junior subordinated debentures are the sole revenues of the Trust. All of the common securities of the Master Trust are owned by the Company. Washington Banking Company has fully and unconditionally guaranteed the capital securities along with all obligations of the Master Trust under the trust agreements.