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Subordinated Notes and Junior Subordinated Debentures - Additional Information (Details) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Debt Instrument [Line Items] |  |
Principal amount | $ 45,000,000 | $ 45,000,000
Fixed-To-Floating Subordinate Notes Mature on July 1, 2030 | Subordinated Notes |  |
Debt Instrument [Line Items] |  |
Debt instrument, face amount |  | $ 75,000,000.0
Debt instrument, interest rate |  | 6.00%
Debt instrument, maturity date |  | Jul. 01, 2030
Debt instrument, redemption, description | As of September 30, 2021, the net liability outstanding of the subordinated notes was $73.5 million. The Company may, at its option, redeem the notes, in whole or in part, on a semi-annual basis beginning on July 1, 2025, subject to obtaining the prior approval of the Federal Reserve to the extent such approval is then required. |
Debt issuance costs |  | $ 1,700,000
Debt issuance costs, amortization period |  | 10 years
Net liability outstanding of subordinated notes | $ 73,500,000 |
Fixed-To-Floating Subordinate Notes Mature on July 1, 2030 | Subordinated Notes | Three-Month Secured Overnight Financing Rate Plus 588 Basis Points |  |
Debt Instrument [Line Items] |  |
Debt instrument, description of variable rate basis | The subordinated notes bear a fixed interest rate of 6.00% until July 1, 2025 and a floating interest rate equal to a benchmark rate, which is expected to be the three-month Secured Overnight Financing Rate, plus 588 basis points thereafter until maturity. |
Metropolitan Statutory Trust 1 |  |
Debt Instrument [Line Items] |  |
Principal amount | $ 35,000,000 | $ 35,000,000
Metropolitan Statutory Trust 1 | Junior Subordinated Debentures |  |
Debt Instrument [Line Items] |  |
Debt instrument, maturity date | Mar. 17, 2034 |
Contractual rate | 2.91% | 3.02%
Accrued interest payable | $ 41,000 | $ 45,000
Metropolitan Statutory Trust 1 | Junior Subordinated Debentures | Three-month LIBOR |  |
Debt Instrument [Line Items] |  |
Debt instrument, description of variable rate basis | Three-monthLIBOR + 2.79% |
Interest rate spread | 2.79% | 2.79%
First Evanston Bancorp Trust I |  |
Debt Instrument [Line Items] |  |
Principal amount | $ 10,000,000 | $ 10,000,000
First Evanston Bancorp Trust I | Junior Subordinated Debentures |  |
Debt Instrument [Line Items] |  |
Debt instrument, maturity date | Mar. 15, 2035 |
Contractual rate | 1.90% | 2.00%
Accrued interest payable | $ 8,000 | $ 9,000
First Evanston Bancorp Trust I | Junior Subordinated Debentures | Three-month LIBOR |  |
Debt Instrument [Line Items] |  |
Debt instrument, description of variable rate basis | Three-monthLIBOR + 1.78% |
Interest rate spread | 1.78% | 1.78%

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