Junior Subordinated Debt	6 Months Ended
Jun. 30, 2011
Other Borrowings & Junior Subordinated Debt [Abstract]
Junior Subordinated Debt	Note 17 — Junior Subordinated Debt On July 31, 2003, the Company formed a subsidiary business trust, TriCo Capital Trust I, to issue trust preferred securities. Concurrently with the issuance of the trust preferred securities, the trust issued 619 shares of common stock to the Company for $1,000 per share or an aggregate of $619,000. In addition, the Company issued a Junior Subordinated Debenture to the Trust in the amount of $20,619,000. The terms of the Junior Subordinated Debenture are materially consistent with the terms of the trust preferred securities issued by TriCo Capital Trust I. Also on July 31, 2003, TriCo Capital Trust I completed an offering of 20,000 shares of cumulative trust preferred securities for cash in an aggregate amount of $20,000,000. The trust preferred securities are mandatorily redeemable upon maturity on October 7, 2033 with an interest rate that resets quarterly at three-month LIBOR plus 3.05%. TriCo Capital Trust I has the right to redeem the trust preferred securities on or after October 7, 2008. The trust preferred securities were issued through an underwriting syndicate to which the Company paid underwriting fees of $7.50 per trust preferred security or an aggregate of $150,000. The net proceeds of $19,850,000 were used to finance the opening of new branches, improve bank services and technology, repurchase shares of the Company’s common stock under its repurchase plan and increase the Company’s capital. The trust preferred securities have not been and will not be registered under the Securities Act of 1933, as amended, or applicable state securities laws and were sold pursuant to an exemption from registration under the Securities Act of 1933. The trust preferred securities may not be offered or sold in the United States absent registration or an applicable exemption from the registration requirements of the Securities Act of 1933, as amended, and applicable state securities laws. The $20,619,000 of junior subordinated debentures issued by TriCo Capital Trust I are reflected as junior subordinated debt in the consolidated balance sheets. The common stock issued by TriCo Capital Trust I are recorded in other assets in the consolidated balance sheets. On June 22, 2004, the Company formed a second subsidiary business trust, TriCo Capital Trust II, to issue trust preferred securities. Concurrently with the issuance of the trust preferred securities, the trust issued 619 shares of common stock to the Company for $1,000 per share or an aggregate of $619,000. In addition, the Company issued a Junior Subordinated Debenture to the Trust in the amount of $20,619,000. The terms of the Junior Subordinated Debenture are materially consistent with the terms of the trust preferred securities issued by TriCo Capital Trust II. Also on June 22, 2004, TriCo Capital Trust II completed an offering of 20,000 shares of cumulative trust preferred securities for cash in an aggregate amount of $20,000,000. The trust preferred securities are mandatorily redeemable upon maturity on July 23, 2034 with an interest rate that resets quarterly at three-month LIBOR plus 2.55%. TriCo Capital Trust II has the right to redeem the trust preferred securities on or after July 23, 2009. The trust preferred securities were issued through an underwriting syndicate to which the Company paid underwriting fees of $2.50 per trust preferred security or an aggregate of $50,000. The net proceeds of $19,950,000 were used to finance the opening of new branches, improve bank services and technology, repurchase shares of the Company’s common stock under its repurchase plan and increase the Company’s capital. The trust preferred securities have not been and will not be registered under the Securities Act of 1933, as amended, or applicable state securities laws and were sold pursuant to an exemption from registration under the Securities Act of 1933. The trust preferred securities may not be offered or sold in the United States absent registration or an applicable exemption from the registration requirements of the Securities Act of 1933, as amended, and applicable state securities laws. The $20,619,000 of junior subordinated debentures issued by TriCo Capital Trust II are reflected as junior subordinated debt in the consolidated balance sheets. The common stock issued by TriCo Capital Trust II is recorded in other assets in the consolidated balance sheets. The debentures issued by TriCo Capital Trust I and TriCo Capital Trust II, less the common securities of TriCo Capital Trust I and TriCo Capital Trust II, continue to qualify as Tier 1 or Tier 2 capital under interim guidance issued by the Board of Governors of the Federal Reserve System (Federal Reserve Board).

Note 17 — Junior Subordinated Debt

On July 31, 2003, the Company formed a subsidiary business trust, TriCo Capital Trust I, to issue trust preferred securities. Concurrently with the issuance of the trust preferred securities, the trust issued 619 shares of common stock to the Company for $1,000 per share or an aggregate of $619,000. In addition, the Company issued a Junior Subordinated Debenture to the Trust in the amount of $20,619,000. The terms of the Junior Subordinated Debenture are materially consistent with the terms of the trust preferred securities issued by TriCo Capital Trust I. Also on July 31, 2003, TriCo Capital Trust I completed an offering of 20,000 shares of cumulative trust preferred securities for cash in an aggregate amount of $20,000,000. The trust preferred securities are mandatorily redeemable upon maturity on October 7, 2033 with an interest rate that resets quarterly at three-month LIBOR plus 3.05%. TriCo Capital Trust I has the right to redeem the trust preferred securities on or after October 7, 2008. The trust preferred securities were issued through an underwriting syndicate to which the Company paid underwriting fees of $7.50 per trust preferred security or an aggregate of $150,000. The net proceeds of $19,850,000 were used to finance the opening of new branches, improve bank services and technology, repurchase shares of the Company’s common stock under its repurchase plan and increase the Company’s capital. The trust preferred securities have not been and will not be registered under the Securities Act of 1933, as amended, or applicable state securities laws and were sold pursuant to an exemption from registration under the Securities Act of 1933. The trust preferred securities may not be offered or sold in the United States absent registration or an applicable exemption from the registration requirements of the Securities Act of 1933, as amended, and applicable state securities laws.

The $20,619,000 of junior subordinated debentures issued by TriCo Capital Trust I are reflected as junior subordinated debt in the consolidated balance sheets. The common stock issued by TriCo Capital Trust I are recorded in other assets in the consolidated balance sheets.

On June 22, 2004, the Company formed a second subsidiary business trust, TriCo Capital Trust II, to issue trust preferred securities. Concurrently with the issuance of the trust preferred securities, the trust issued 619 shares of common stock to the Company for $1,000 per share or an aggregate of $619,000. In addition, the Company issued a Junior Subordinated Debenture to the Trust in the amount of $20,619,000. The terms of the Junior Subordinated Debenture are materially consistent with the terms of the trust preferred securities issued by TriCo Capital Trust II. Also on June 22, 2004, TriCo Capital Trust II completed an offering of 20,000 shares of cumulative trust preferred securities for cash in an aggregate amount of $20,000,000. The trust preferred securities are mandatorily redeemable upon maturity on July 23, 2034 with an interest rate that resets quarterly at three-month LIBOR plus 2.55%. TriCo Capital Trust II has the right to redeem the trust preferred securities on or after July 23, 2009. The trust preferred securities were issued through an underwriting syndicate to which the Company paid underwriting fees of $2.50 per trust preferred security or an aggregate of $50,000. The net proceeds of $19,950,000 were used to finance the opening of new branches, improve bank services and technology, repurchase shares of the Company’s common stock under its repurchase plan and increase the Company’s capital. The trust preferred securities have not been and will not be registered under the Securities Act of 1933, as amended, or applicable state securities laws and were sold pursuant to an exemption from registration under the Securities Act of 1933. The trust preferred securities may not be offered or sold in the United States absent registration or an applicable exemption from the registration requirements of the Securities Act of 1933, as amended, and applicable state securities laws.

The $20,619,000 of junior subordinated debentures issued by TriCo Capital Trust II are reflected as junior subordinated debt in the consolidated balance sheets. The common stock issued by TriCo Capital Trust II is recorded in other assets in the consolidated balance sheets.

The debentures issued by TriCo Capital Trust I and TriCo Capital Trust II, less the common securities of TriCo Capital Trust I and TriCo Capital Trust II, continue to qualify as Tier 1 or Tier 2 capital under interim guidance issued by the Board of Governors of the Federal Reserve System (Federal Reserve Board).