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Junior and Other Subordinated Debentures (Junior Subordinated Debentures) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Junior Subordinated Debentures [Line Items]    
Issued amount $ 475,272  
Carrying value, at fair value 330,895 $ 316,440
Carrying value 428,563  
Junior Subordinated Debt, at Fair Value    
Junior Subordinated Debentures [Line Items]    
Issued amount 379,390  
Carrying value, at fair value 330,895  
Junior Subordinated Debt, at Fair Value | Umpqua Statutory Trust II    
Junior Subordinated Debentures [Line Items]    
Issued amount 20,619  
Carrying value, at fair value $ 19,942  
Variable rate basis SOFR + 0.26161%  
Basis spread on SOFR+0.26161% 3.35%  
Effective rate 8.48%  
Junior Subordinated Debt, at Fair Value | Umpqua Statutory Trust III    
Junior Subordinated Debentures [Line Items]    
Issued amount $ 30,928  
Carrying value, at fair value $ 30,030  
Variable rate basis SOFR + 0.26161%  
Basis spread on SOFR+0.26161% 3.45%  
Effective rate 8.48%  
Junior Subordinated Debt, at Fair Value | Umpqua Statutory Trust IV    
Junior Subordinated Debentures [Line Items]    
Issued amount $ 10,310  
Carrying value, at fair value $ 9,638  
Variable rate basis SOFR + 0.26161%  
Basis spread on SOFR+0.26161% 2.85%  
Effective rate 8.31%  
Junior Subordinated Debt, at Fair Value | Umpqua Statutory Trust V    
Junior Subordinated Debentures [Line Items]    
Issued amount $ 10,310  
Carrying value, at fair value $ 9,480  
Variable rate basis SOFR + 0.26161%  
Basis spread on SOFR+0.26161% 2.85%  
Effective rate 8.11%  
Junior Subordinated Debt, at Fair Value | Umpqua Master Trust I    
Junior Subordinated Debentures [Line Items]    
Issued amount $ 41,238  
Carrying value, at fair value $ 32,370  
Variable rate basis SOFR + 0.26161%  
Basis spread on SOFR+0.26161% 1.35%  
Effective rate 7.61%  
Junior Subordinated Debt, at Fair Value | Umpqua Master Trust IB    
Junior Subordinated Debentures [Line Items]    
Issued amount $ 20,619  
Carrying value, at fair value $ 18,408  
Variable rate basis SOFR + 0.26161%  
Basis spread on SOFR+0.26161% 2.75%  
Effective rate 8.26%  
Junior Subordinated Debt, at Fair Value | Sterling Capital Trust III    
Junior Subordinated Debentures [Line Items]    
Issued amount $ 14,433  
Carrying value, at fair value $ 13,905  
Variable rate basis SOFR + 0.26161%  
Basis spread on SOFR+0.26161% 3.25%  
Effective rate 8.39%  
Junior Subordinated Debt, at Fair Value | Sterling Capital Trust IV    
Junior Subordinated Debentures [Line Items]    
Issued amount $ 10,310  
Carrying value, at fair value $ 9,788  
Variable rate basis SOFR + 0.26161%  
Basis spread on SOFR+0.26161% 3.15%  
Effective rate 8.36%  
Junior Subordinated Debt, at Fair Value | Sterling Capital Statutory Trust V    
Junior Subordinated Debentures [Line Items]    
Issued amount $ 20,619  
Carrying value, at fair value $ 19,559  
Variable rate basis SOFR + 0.26161%  
Basis spread on SOFR+0.26161% 3.25%  
Effective rate 8.26%  
Junior Subordinated Debt, at Fair Value | Sterling Capital Trust VI    
Junior Subordinated Debentures [Line Items]    
Issued amount $ 10,310  
Carrying value, at fair value $ 9,703  
Variable rate basis SOFR + 0.26161%  
Basis spread on SOFR+0.26161% 3.20%  
Effective rate 8.31%  
Junior Subordinated Debt, at Fair Value | Sterling Capital Trust VII    
Junior Subordinated Debentures [Line Items]    
Issued amount $ 56,702  
Carrying value, at fair value $ 45,972  
Variable rate basis SOFR + 0.26161%  
Basis spread on SOFR+0.26161% 1.53%  
Effective rate 7.58%  
Junior Subordinated Debt, at Fair Value | Sterling Capital Trust VIII    
Junior Subordinated Debentures [Line Items]    
Issued amount $ 51,547  
Carrying value, at fair value $ 41,928  
Variable rate basis SOFR + 0.26161%  
Basis spread on SOFR+0.26161% 1.63%  
Effective rate 7.68%  
Junior Subordinated Debt, at Fair Value | Sterling Capital Trust IX    
Junior Subordinated Debentures [Line Items]    
Issued amount $ 46,392  
Carrying value, at fair value $ 37,143  
Variable rate basis SOFR + 0.26161%  
Basis spread on SOFR+0.26161% 1.40%  
Effective rate 7.81%  
Junior Subordinated Debt, at Fair Value | Lynnwood Financial Statutory Trust I    
Junior Subordinated Debentures [Line Items]    
Issued amount $ 9,279  
Carrying value, at fair value $ 8,736  
Variable rate basis SOFR + 0.26161%  
Basis spread on SOFR+0.26161% 3.15%  
Effective rate 8.22%  
Junior Subordinated Debt, at Fair Value | Lynnwood Financial Statutory Trust II    
Junior Subordinated Debentures [Line Items]    
Issued amount $ 10,310  
Carrying value, at fair value $ 8,660  
Variable rate basis SOFR + 0.26161%  
Basis spread on SOFR+0.26161% 1.80%  
Effective rate 7.64%  
Junior Subordinated Debt, at Fair Value | Klamath First Capital Trust I    
Junior Subordinated Debentures [Line Items]    
Issued amount $ 15,464  
Carrying value, at fair value $ 15,633  
Variable rate basis SOFR + 0.42826%  
Basis spread on SOFR+0.26161% 3.75%  
Effective rate 9.16%  
Junior Subordinated Debt, at Amortized Cost    
Junior Subordinated Debentures [Line Items]    
Issued amount $ 95,882  
Carrying value, at amortized cost 97,668  
Junior Subordinated Debt, at Amortized Cost | Humboldt Bancorp Statutory Trust II    
Junior Subordinated Debentures [Line Items]    
Issued amount 10,310  
Carrying value, at amortized cost $ 10,681  
Variable rate basis SOFR + 0.26161%  
Basis spread on SOFR+0.26161% 3.60%  
Effective rate 7.42%  
Junior Subordinated Debt, at Amortized Cost | Humboldt Bancorp Statutory Trust III    
Junior Subordinated Debentures [Line Items]    
Issued amount $ 27,836  
Carrying value, at amortized cost $ 28,911  
Variable rate basis SOFR + 0.26161%  
Basis spread on SOFR+0.26161% 2.95%  
Effective rate 6.83%  
Junior Subordinated Debt, at Amortized Cost | CIB Capital Trust    
Junior Subordinated Debentures [Line Items]    
Issued amount $ 10,310  
Carrying value, at amortized cost $ 10,650  
Variable rate basis SOFR + 0.26161%  
Basis spread on SOFR+0.26161% 3.45%  
Effective rate 7.56%  
Junior Subordinated Debt, at Amortized Cost | Western Sierra Statutory Trust I    
Junior Subordinated Debentures [Line Items]    
Issued amount $ 6,186  
Carrying value, at amortized cost $ 6,186  
Variable rate basis SOFR + 0.26161%  
Basis spread on SOFR+0.26161% 3.58%  
Effective rate 8.43%  
Junior Subordinated Debt, at Amortized Cost | Western Sierra Statutory Trust II    
Junior Subordinated Debentures [Line Items]    
Issued amount $ 10,310  
Carrying value, at amortized cost $ 10,310  
Variable rate basis SOFR + 0.26161%  
Basis spread on SOFR+0.26161% 3.60%  
Effective rate 8.21%  
Junior Subordinated Debt, at Amortized Cost | Western Sierra Statutory Trust III    
Junior Subordinated Debentures [Line Items]    
Issued amount $ 10,310  
Carrying value, at amortized cost $ 10,310  
Variable rate basis SOFR + 0.26161%  
Basis spread on SOFR+0.26161% 2.90%  
Effective rate 7.82%  
Junior Subordinated Debt, at Amortized Cost | Western Sierra Statutory Trust IV    
Junior Subordinated Debentures [Line Items]    
Issued amount $ 10,310  
Carrying value, at amortized cost $ 10,310  
Variable rate basis SOFR + 0.26161%  
Basis spread on SOFR+0.26161% 2.90%  
Effective rate 7.82%  
Junior Subordinated Debt, at Amortized Cost | Bank of Commerce Holdings Trust II    
Junior Subordinated Debentures [Line Items]    
Issued amount $ 10,310  
Carrying value, at amortized cost $ 10,310  
Variable rate basis SOFR + 0.26161%  
Basis spread on SOFR+0.26161% 1.58%  
Effective rate 6.20%  
Other Subordinated Debt    
Junior Subordinated Debentures [Line Items]    
Carrying value, at amortized cost $ 10,000 $ 10,000
Basis spread on SOFR+0.26161% 5.26% 5.26%