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Junior Subordinated Debentures - Schedule of Junior Subordinated Debentures (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2025 | Dec. 31, 2024
Subordinated Borrowing [Line Items] |  |
Junior subordinated debentures | $ 253,566 | $ 253,566
Junior Subordinated Debt |  |
Subordinated Borrowing [Line Items] |  |
Junior subordinated debentures | $ 253,566 | 253,566
Contractual rate (as a percent) | 6.19% |
Junior Subordinated Debt | Wintrust Capital Trust III |  |
Subordinated Borrowing [Line Items] |  |
Common Securities | $ 774 |
Trust Preferred Securities | 25,000 |
Junior subordinated debentures | $ 25,774 | 25,774
Rate Structure, stated | 0.26161% |
Rate Structure, variable | 3.25% |
Contractual rate (as a percent) | 7.42% |
Junior Subordinated Debt | Wintrust Statutory Trust IV |  |
Subordinated Borrowing [Line Items] |  |
Common Securities | $ 619 |
Trust Preferred Securities | 20,000 |
Junior subordinated debentures | $ 20,619 | 20,619
Rate Structure, stated | 0.26161% |
Rate Structure, variable | 2.80% |
Contractual rate (as a percent) | 6.73% |
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 | 41,238
Rate Structure, stated | 0.26161% |
Rate Structure, variable | 2.60% |
Contractual rate (as a percent) | 6.53% |
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 | 51,550
Rate Structure, stated | 0.26161% |
Rate Structure, variable | 1.95% |
Contractual rate (as a percent) | 5.93% |
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 | 26,238
Rate Structure, stated | 0.26161% |
Rate Structure, variable | 1.45% |
Contractual rate (as a percent) | 5.38% |
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 | 51,547
Rate Structure, stated | 0.26161% |
Rate Structure, variable | 1.63% |
Contractual rate (as a percent) | 5.61% |
Junior Subordinated Debt | Northview Capital Trust I |  |
Subordinated Borrowing [Line Items] |  |
Common Securities | $ 186 |
Trust Preferred Securities | 6,000 |
Junior subordinated debentures | $ 6,186 | 6,186
Rate Structure, stated | 0.26161% |
Rate Structure, variable | 3.00% |
Contractual rate (as a percent) | 7.12% |
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 | 6,186
Rate Structure, stated | 0.26161% |
Rate Structure, variable | 3.00% |
Contractual rate (as a percent) | 7.12% |
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 | 5,155
Rate Structure, stated | 0.26161% |
Rate Structure, variable | 3.00% |
Contractual rate (as a percent) | 6.93% |
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 | 15,464
Rate Structure, stated | 0.26161% |
Rate Structure, variable | 1.75% |
Contractual rate (as a percent) | 5.73% |
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 | $ 3,609
Rate Structure, stated | 0.26161% |
Rate Structure, variable | 1.62% |
Contractual rate (as a percent) | 5.60% |

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