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Junior Subordinated Debentures - Schedule of Junior Subordinated Debentures (Details) - USD ($) $ in Thousands | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2025 | Dec. 31, 2024 | Jun. 30, 2024
Subordinated Borrowing [Line Items] |  |  |
Junior Subordinated Debentures | $ 253,566 | $ 253,566 | $ 253,566
Junior Subordinated Debt |  |  |
Subordinated Borrowing [Line Items] |  |  |
Junior Subordinated Debentures | $ 253,566 | $ 253,600 | $ 253,600
Weighted average contractual rate | 6.76% |  |
Junior Subordinated Debt | Wintrust Capital Trust III |  |  |
Subordinated Borrowing [Line Items] |  |  |
Common Securities | $ 774 |  |
Trust Preferred Securities | 25,000 |  |
Junior Subordinated Debentures | $ 25,774 |  |
Rate structure, stated | 0.26161% |  |
Rate structure, variable | 3.25% |  |
Weighted average contractual rate | 7.77% |  |
Junior Subordinated Debt | Wintrust Statutory Trust IV |  |  |
Subordinated Borrowing [Line Items] |  |  |
Common Securities | $ 619 |  |
Trust Preferred Securities | 20,000 |  |
Junior Subordinated Debentures | $ 20,619 |  |
Rate structure, stated | 0.26161% |  |
Rate structure, variable | 2.80% |  |
Weighted average contractual rate | 7.36% |  |
Junior Subordinated Debt | Wintrust Statutory Trust V |  |  |
Subordinated Borrowing [Line Items] |  |  |
Common Securities | $ 1,238 |  |
Trust Preferred Securities | 40,000 |  |
Junior Subordinated Debentures | $ 41,238 |  |
Rate structure, stated | 0.26161% |  |
Rate structure, variable | 2.60% |  |
Weighted average contractual rate | 7.16% |  |
Junior Subordinated Debt | Wintrust Capital Trust VII |  |  |
Subordinated Borrowing [Line Items] |  |  |
Common Securities | $ 1,550 |  |
Trust Preferred Securities | 50,000 |  |
Junior Subordinated Debentures | $ 51,550 |  |
Rate structure, stated | 0.26161% |  |
Rate structure, variable | 1.95% |  |
Weighted average contractual rate | 6.53% |  |
Junior Subordinated Debt | Wintrust Capital Trust VIII |  |  |
Subordinated Borrowing [Line Items] |  |  |
Common Securities | $ 1,238 |  |
Trust Preferred Securities | 25,000 |  |
Junior Subordinated Debentures | $ 26,238 |  |
Rate structure, stated | 0.26161% |  |
Rate structure, variable | 1.45% |  |
Weighted average contractual rate | 6.01% |  |
Junior Subordinated Debt | Wintrust Capital Trust IX |  |  |
Subordinated Borrowing [Line Items] |  |  |
Common Securities | $ 1,547 |  |
Trust Preferred Securities | 50,000 |  |
Junior Subordinated Debentures | $ 51,547 |  |
Rate structure, stated | 0.26161% |  |
Rate structure, variable | 1.63% |  |
Weighted average contractual rate | 6.21% |  |
Junior Subordinated Debt | Northview Capital Trust I |  |  |
Subordinated Borrowing [Line Items] |  |  |
Common Securities | $ 186 |  |
Trust Preferred Securities | 6,000 |  |
Junior Subordinated Debentures | $ 6,186 |  |
Rate structure, stated | 0.26161% |  |
Rate structure, variable | 3.00% |  |
Weighted average contractual rate | 7.54% |  |
Junior Subordinated Debt | Town Bankshares Capital Trust I |  |  |
Subordinated Borrowing [Line Items] |  |  |
Common Securities | $ 186 |  |
Trust Preferred Securities | 6,000 |  |
Junior Subordinated Debentures | $ 6,186 |  |
Rate structure, stated | 0.26161% |  |
Rate structure, variable | 3.00% |  |
Weighted average contractual rate | 7.54% |  |
Junior Subordinated Debt | First Northwest Capital Trust I |  |  |
Subordinated Borrowing [Line Items] |  |  |
Common Securities | $ 155 |  |
Trust Preferred Securities | 5,000 |  |
Junior Subordinated Debentures | $ 5,155 |  |
Rate structure, stated | 0.26161% |  |
Rate structure, variable | 3.00% |  |
Weighted average contractual rate | 7.56% |  |
Junior Subordinated Debt | Suburban Illinois Capital Trust II |  |  |
Subordinated Borrowing [Line Items] |  |  |
Common Securities | $ 464 |  |
Trust Preferred Securities | 15,000 |  |
Junior Subordinated Debentures | $ 15,464 |  |
Rate structure, stated | 0.26161% |  |
Rate structure, variable | 1.75% |  |
Weighted average contractual rate | 6.33% |  |
Junior Subordinated Debt | Community Financial Shares Statutory Trust II |  |  |
Subordinated Borrowing [Line Items] |  |  |
Common Securities | $ 109 |  |
Trust Preferred Securities | 3,500 |  |
Junior Subordinated Debentures | $ 3,609 |  |
Rate structure, stated | 0.26161% |  |
Rate structure, variable | 1.62% |  |
Weighted average contractual rate | 6.20% |  |

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- Definition The total amount of cash and securities held by third party trustees pursuant to terms of debt instruments or other agreements as of the date of each statement of financial position presented, which can be used by the trustee only to pay the noncurrent portion of specified obligations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480738/235-10-S50-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 235 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(b)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1 + Details
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