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Junior Subordinated Debentures (Summary of the Company's Junior Subordinated Debentures) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021
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
Average contractual rate | 6.87% |
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
Contractual rate | 7.33% |
Junior Subordinated Debt | Wintrust Capital Trust III | London Interbank Offered Rate (LIBOR) |  |
Subordinated Borrowing [Line Items] |  |
Rate Structure | 3.25% |
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
Contractual rate | 7.55% |
Junior Subordinated Debt | Wintrust Statutory Trust IV | London Interbank Offered Rate (LIBOR) |  |
Subordinated Borrowing [Line Items] |  |
Rate Structure | 2.80% |
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
Contractual rate | 7.35% |
Junior Subordinated Debt | Wintrust Statutory Trust V | London Interbank Offered Rate (LIBOR) |  |
Subordinated Borrowing [Line Items] |  |
Rate Structure | 2.60% |
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
Contractual rate | 6.72% |
Junior Subordinated Debt | Wintrust Capital Trust VII | London Interbank Offered Rate (LIBOR) |  |
Subordinated Borrowing [Line Items] |  |
Rate Structure | 1.95% |
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
Contractual rate | 6.20% |
Junior Subordinated Debt | Wintrust Capital Trust VIII | London Interbank Offered Rate (LIBOR) |  |
Subordinated Borrowing [Line Items] |  |
Rate Structure | 1.45% |
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
Contractual rate | 6.40% |
Junior Subordinated Debt | Wintrust Capital Trust IX | London Interbank Offered Rate (LIBOR) |  |
Subordinated Borrowing [Line Items] |  |
Rate Structure | 1.63% |
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
Contractual rate | 7.44% |
Junior Subordinated Debt | Northview Capital Trust I | London Interbank Offered Rate (LIBOR) |  |
Subordinated Borrowing [Line Items] |  |
Rate Structure | 3.00% |
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
Contractual rate | 7.44% |
Junior Subordinated Debt | Town Bankshares Capital Trust I | London Interbank Offered Rate (LIBOR) |  |
Subordinated Borrowing [Line Items] |  |
Rate Structure | 3.00% |
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
Contractual rate | 7.75% |
Junior Subordinated Debt | First Northwest Capital Trust I | London Interbank Offered Rate (LIBOR) |  |
Subordinated Borrowing [Line Items] |  |
Rate Structure | 3.00% |
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
Contractual rate | 6.52% |
Junior Subordinated Debt | Suburban Illinois Capital Trust II | London Interbank Offered Rate (LIBOR) |  |
Subordinated Borrowing [Line Items] |  |
Rate Structure | 1.75% |
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
Contractual rate | 6.39% |
Junior Subordinated Debt | Community Financial Shares Statutory Trust II | London Interbank Offered Rate (LIBOR) |  |
Subordinated Borrowing [Line Items] |  |
Rate Structure | 1.62% |

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