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Junior and Other Subordinated Debentures (Junior Subordinated Debentures) (Details) - USD ($) $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Feb. 28, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Junior Subordinated Debentures [Line Items] |  |  |
Issued amount |  | $ 475,272 |
Carrying value, at fair value |  | 316,440 | $ 323,639
Carrying value, at amortized cost |  | 107,895 | $ 87,813
Carrying value |  | 414,335 |
Junior Subordinated Debt, at Fair Value |  |  |
Junior Subordinated Debentures [Line Items] |  |  |
Issued amount |  | 379,390 |
Carrying value, at fair value |  | 316,440 |
Junior Subordinated Debt, at Fair Value | Umpqua Statutory Trust II |  |  |
Junior Subordinated Debentures [Line Items] |  |  |
Issued amount |  | 20,619 |
Carrying value, at fair value |  | $ 19,401 |
Variable rate basis |  | SOFR + 0.26161% |
Basis spread on SOFR+0.26161% |  | 3.35% |
Effective rate |  | 9.57% |
Junior Subordinated Debt, at Fair Value | Umpqua Statutory Trust III |  |  |
Junior Subordinated Debentures [Line Items] |  |  |
Issued amount |  | $ 30,928 |
Carrying value, at fair value |  | $ 29,203 |
Variable rate basis |  | SOFR + 0.26161% |
Basis spread on SOFR+0.26161% |  | 3.45% |
Effective rate |  | 9.63% |
Junior Subordinated Debt, at Fair Value | Umpqua Statutory Trust IV |  |  |
Junior Subordinated Debentures [Line Items] |  |  |
Issued amount |  | $ 10,310 |
Carrying value, at fair value |  | $ 9,319 |
Variable rate basis |  | SOFR + 0.26161% |
Basis spread on SOFR+0.26161% |  | 2.85% |
Effective rate |  | 9.41% |
Junior Subordinated Debt, at Fair Value | Umpqua Statutory Trust V |  |  |
Junior Subordinated Debentures [Line Items] |  |  |
Issued amount |  | $ 10,310 |
Carrying value, at fair value |  | $ 9,146 |
Variable rate basis |  | SOFR + 0.26161% |
Basis spread on SOFR+0.26161% |  | 2.85% |
Effective rate |  | 9.57% |
Junior Subordinated Debt, at Fair Value | Umpqua Master Trust I |  |  |
Junior Subordinated Debentures [Line Items] |  |  |
Issued amount |  | $ 41,238 |
Carrying value, at fair value |  | $ 30,557 |
Variable rate basis |  | SOFR + 0.26161% |
Basis spread on SOFR+0.26161% |  | 1.35% |
Effective rate |  | 9.44% |
Junior Subordinated Debt, at Fair Value | Umpqua Master Trust IB |  |  |
Junior Subordinated Debentures [Line Items] |  |  |
Issued amount |  | $ 20,619 |
Carrying value, at fair value |  | $ 17,644 |
Variable rate basis |  | SOFR + 0.26161% |
Basis spread on SOFR+0.26161% |  | 2.75% |
Effective rate |  | 9.81% |
Junior Subordinated Debt, at Fair Value | Sterling Capital Trust III |  |  |
Junior Subordinated Debentures [Line Items] |  |  |
Issued amount |  | $ 14,433 |
Carrying value, at fair value |  | $ 13,506 |
Variable rate basis |  | SOFR + 0.26161% |
Basis spread on SOFR+0.26161% |  | 3.25% |
Effective rate |  | 9.50% |
Junior Subordinated Debt, at Fair Value | Sterling Capital Trust IV |  |  |
Junior Subordinated Debentures [Line Items] |  |  |
Issued amount |  | $ 10,310 |
Carrying value, at fair value |  | $ 9,489 |
Variable rate basis |  | SOFR + 0.26161% |
Basis spread on SOFR+0.26161% |  | 3.15% |
Effective rate |  | 9.55% |
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 |  | $ 18,955 |
Variable rate basis |  | SOFR + 0.26161% |
Basis spread on SOFR+0.26161% |  | 3.25% |
Effective rate |  | 9.65% |
Junior Subordinated Debt, at Fair Value | Sterling Capital Trust VI |  |  |
Junior Subordinated Debentures [Line Items] |  |  |
Issued amount |  | $ 10,310 |
Carrying value, at fair value |  | $ 9,397 |
Variable rate basis |  | SOFR + 0.26161% |
Basis spread on SOFR+0.26161% |  | 3.20% |
Effective rate |  | 9.71% |
Junior Subordinated Debt, at Fair Value | Sterling Capital Trust VII |  |  |
Junior Subordinated Debentures [Line Items] |  |  |
Issued amount |  | $ 56,702 |
Carrying value, at fair value |  | $ 43,599 |
Variable rate basis |  | SOFR + 0.26161% |
Basis spread on SOFR+0.26161% |  | 1.53% |
Effective rate |  | 9.33% |
Junior Subordinated Debt, at Fair Value | Sterling Capital Trust VIII |  |  |
Junior Subordinated Debentures [Line Items] |  |  |
Issued amount |  | $ 51,547 |
Carrying value, at fair value |  | $ 39,773 |
Variable rate basis |  | SOFR + 0.26161% |
Basis spread on SOFR+0.26161% |  | 1.63% |
Effective rate |  | 9.43% |
Junior Subordinated Debt, at Fair Value | Sterling Capital Trust IX |  |  |
Junior Subordinated Debentures [Line Items] |  |  |
Issued amount |  | $ 46,392 |
Carrying value, at fair value |  | $ 35,166 |
Variable rate basis |  | SOFR + 0.26161% |
Basis spread on SOFR+0.26161% |  | 1.40% |
Effective rate |  | 9.31% |
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 |  | $ 8,464 |
Variable rate basis |  | SOFR + 0.26161% |
Basis spread on SOFR+0.26161% |  | 3.15% |
Effective rate |  | 9.62% |
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 |  | $ 8,253 |
Variable rate basis |  | SOFR + 0.26161% |
Basis spread on SOFR+0.26161% |  | 1.80% |
Effective rate |  | 9.30% |
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 |  | $ 14,568 |
Variable rate basis |  | SOFR + 0.42826% |
Basis spread on SOFR+0.26161% |  | 3.75% |
Effective rate |  | 10.22% |
Junior Subordinated Debt, at Amortized Cost |  |  |
Junior Subordinated Debentures [Line Items] |  |  |
Issued amount |  | $ 95,882 |
Carrying value, at amortized cost |  | 97,895 |
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 |  | $ 10,735 |
Variable rate basis |  | SOFR + 0.26161% |
Basis spread on SOFR+0.26161% |  | 3.60% |
Effective rate |  | 8.37% |
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 |  | $ 29,041 |
Variable rate basis |  | SOFR + 0.26161% |
Basis spread on SOFR+0.26161% |  | 2.95% |
Effective rate |  | 7.79% |
Junior Subordinated Debt, at Amortized Cost | CIB Capital Trust |  |  |
Junior Subordinated Debentures [Line Items] |  |  |
Issued amount |  | $ 10,310 |
Carrying value, at amortized cost |  | $ 10,693 |
Variable rate basis |  | SOFR + 0.26161% |
Basis spread on SOFR+0.26161% |  | 3.45% |
Effective rate |  | 8.35% |
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 |  | 9.22% |
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 |  | 9.24% |
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 |  | 8.56% |
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 |  | 8.56% |
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 | $ 10,300 | $ 10,310 |
Variable rate basis |  | SOFR + 0.26161% |
Basis spread on SOFR+0.26161% |  | 1.58% |
Effective rate |  | 7.23% |
Other Subordinated Debt |  |  |
Junior Subordinated Debentures [Line Items] |  |  |
Carrying value, at amortized cost | $ 10,000 |  |
Basis spread on SOFR+0.26161% | 5.26% |  |

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