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Junior Subordinated Debentures (Junior Subordinated Debentures) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2011
Issued Amount $ 230,061
Carrying Value 184,471 [1]
Umpqua Statutory Trust III [Member] | CIB Capital Trust [Member] | Amortized Cost [Member]
  
Interest Rate Adjustment 3.45%
Umpqua Statutory Trust III [Member] | Estimated Fair Value [Member]
  
Issue Date October 2002
Issued Amount 30,928
Carrying Value 21,235 [1]
Rate Floating (5) [2],[3]
Effective Rate 11.62% [4]
Maturity Date November 2032
Redemption Date November 2007
Umpqua Statutory Trust III [Member] | Subordinated Debt Carrying Value [Member]
  
Interest Rate Adjustment 3.45%
Umpqua Statutory Trust IV [Member] | Umpqua Statutory Trust V [Member] | Estimated Fair Value [Member]
  
Interest Rate Adjustment 2.85%
Umpqua Statutory Trust IV [Member] | Estimated Fair Value [Member]
  
Issue Date December 2003
Issued Amount 10,310
Carrying Value 6,551 [1]
Rate Floating (6) [2],[5]
Effective Rate 11.64% [4]
Maturity Date January 2034
Redemption Date January 2009
Umpqua Statutory Trust IV [Member] | Subordinated Debt Carrying Value [Member]
  
Interest Rate Adjustment 2.85%
Umpqua Statutory Trust II [Member] | Estimated Fair Value [Member]
  
Issue Date October 2002
Issued Amount 20,619
Carrying Value 13,999 [1]
Rate Floating (4) [2],[6]
Effective Rate 11.62% [4]
Maturity Date October 2032
Redemption Date October 2007
Umpqua Statutory Trust II [Member] | Subordinated Debt Carrying Value [Member]
  
Interest Rate Adjustment 3.35%
Umpqua Statutory Trust V [Member] | Estimated Fair Value [Member]
  
Issue Date December 2003
Issued Amount 10,310
Carrying Value 6,540 [1]
Rate Floating (6) [2],[5]
Effective Rate 11.64% [4]
Maturity Date March 2034
Redemption Date March 2009
Umpqua Master Trust I [Member] | Estimated Fair Value [Member]
  
Issue Date August 2007
Issued Amount 41,238
Carrying Value 20,733 [1]
Rate Floating (7) [2],[7]
Effective Rate 11.69% [4]
Maturity Date September 2037
Redemption Date September 2012
Umpqua Master Trust I [Member] | Subordinated Debt Carrying Value [Member]
  
Interest Rate Adjustment 1.35%
Umpqua Master Trust IB [Member] | Estimated Fair Value [Member]
  
Issue Date September 2007
Issued Amount 20,619
Carrying Value 12,708 [1]
Rate Floating (8) [2],[8]
Effective Rate 11.65% [4]
Maturity Date December 2037
Redemption Date December 2012
Umpqua Master Trust IB [Member] | Subordinated Debt Carrying Value [Member]
  
Interest Rate Adjustment 2.75%
HB Capital Trust I [Member] | Amortized Cost [Member]
  
Issue Date March 2000
Issued Amount 5,310
Carrying Value 6,357 [1]
Rate 10.875% [2]
Effective Rate 8.20% [4]
Maturity Date March 2030
Redemption Date March 2010
Humboldt Bancorp Statutory Trust I [Member] | Amortized Cost [Member]
  
Issue Date February 2001
Issued Amount 5,155
Carrying Value 5,916 [1]
Rate 10.200% [2]
Effective Rate 8.23% [4]
Maturity Date February 2031
Redemption Date February 2011
Humboldt Bancorp Statutory Trust II [Member] | Subordinated Debt Carrying Value [Member]
  
Interest Rate Adjustment 3.60%
Humboldt Bancorp Statutory Trust II [Member] | Amortized Cost [Member]
  
Issue Date December 2001
Issued Amount 10,310
Carrying Value 11,405 [1]
Rate Floating (9) [2],[9]
Effective Rate 3.00% [4]
Maturity Date December 2031
Redemption Date December 2006
Humboldt Bancorp Statutory Trust III [Member] | Subordinated Debt Carrying Value [Member]
  
Interest Rate Adjustment 2.95%
Humboldt Bancorp Statutory Trust III [Member] | Amortized Cost [Member]
  
Issue Date September 2003
Issued Amount 27,836
Carrying Value 30,670 [1]
Rate Floating (10) [10],[2]
Effective Rate 2.48% [4]
Maturity Date September 2033
Redemption Date September 2008
CIB Capital Trust [Member] | Amortized Cost [Member]
  
Issue Date November 2002
Issued Amount 10,310
Carrying Value 11,241 [1]
Rate Floating (5) [2],[3]
Effective Rate 3.01% [4]
Maturity Date November 2032
Redemption Date November 2007
Western Sierra Statutory Trust I [Member] | Subordinated Debt Carrying Value [Member]
  
Interest Rate Adjustment 3.58%
Western Sierra Statutory Trust I [Member] | Amortized Cost [Member]
  
Issue Date July 2001
Issued Amount 6,186
Carrying Value 6,186 [1]
Rate Floating (11) [11],[2]
Effective Rate 3.85% [4]
Maturity Date July 2031
Redemption Date July 2006
Western Sierra Statutory Trust II [Member] | Amortized Cost [Member]
  
Issue Date December 2001
Issued Amount 10,310
Carrying Value 10,310 [1]
Rate Floating (9) [2],[9]
Effective Rate 3.85% [4]
Maturity Date December 2031
Redemption Date December 2006
Interest Rate Adjustment 3.60%
Western Sierra Statutory Trust III [Member] | Subordinated Debt Carrying Value [Member]
  
Interest Rate Adjustment 2.90%
Western Sierra Statutory Trust III [Member] | Amortized Cost [Member]
  
Issue Date September 2003
Issued Amount 10,310
Carrying Value 10,310 [1]
Rate Floating (12) [12],[2]
Effective Rate 3.18% [4]
Maturity Date September 2033
Redemption Date September 2008
Western Sierra Statutory Trust IV [Member] | Amortized Cost [Member]
  
Issue Date September 2003
Issued Amount 10,310
Carrying Value 10,310 [1]
Rate Floating (12) [12],[2]
Effective Rate 3.18% [4]
Maturity Date September 2033
Redemption Date September 2008
Interest Rate Adjustment 2.90%
Estimated Fair Value [Member]
  
Issued Amount 134,024
Carrying Value 81,766 [1]
Amortized Cost [Member]
  
Issued Amount 96,037
Carrying Value $ 102,705 [1]
[1] Includes purchase accounting adjustments, net of accumulated amortization, for junior subordinated debentures assumed in connection with previous mergers as well as fair value adjustments related to trusts recorded at fair value.
[2] Contractual interest rate of junior subordinated debentures.
[3] Rate based on LIBOR plus 3.45%, adjusted quarterly.
[4] Effective interest rate based upon the carrying value as of June 2011.
[5] Rate based on LIBOR plus 2.85%, adjusted quarterly.
[6] Rate based on LIBOR plus 3.35%, adjusted quarterly.
[7] Rate based on LIBOR plus 1.35%, adjusted quarterly.
[8] Rate based on LIBOR plus 2.75%, adjusted quarterly.
[9] Rate based on LIBOR plus 3.60%, adjusted quarterly.
[10] Rate based on LIBOR plus 2.95%, adjusted quarterly.
[11] Rate based on LIBOR plus 3.58%, adjusted quarterly.
[12] Rate based on LIBOR plus 2.90%, adjusted quarterly.