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Subordinated Notes and Junior Subordinated Debentures - Additional Information (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jun. 26, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Jun. 30, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019 | Aug. 03, 2020
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Principal amount |  | $ 45,000,000 |  |  | $ 45,000,000 |  | $ 46,500,000 |
Other non-interest expense |  | 3,959,000 | $ 4,224,000 |  | $ 12,310,000 | $ 12,657,000 |  |
6.00 % Fixed-To-Floating Subordinate Notes Mature on July 1, 2030 | Subordinated Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, face amount | $ 50,000,000.0 |  |  |  |  |  |  | $ 25,000,000.0
Debt instrument, interest rate | 6.00% |  |  |  |  |  |  |
Debt instrument, maturity date | Jul. 01, 2030 |  |  |  |  |  |  |
Debt instrument, redemption, description |  |  |  |  | As of September 30, 2020, the net liability outstanding of the subordinated notes was $73.3 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 |  | 73,300,000 |  |  | $ 73,300,000 |  |  |
6.00 % 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 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 |  | $ 35,000,000 |
Metropolitan Statutory Trust 1 | Junior Subordinated Debentures |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, maturity date |  |  |  |  | Mar. 17, 2034 |  |  |
Contractual rate |  | 3.03% |  |  | 3.03% |  | 4.69% |
Accrued interest payable |  | $ 43,000 |  |  | $ 43,000 |  | $ 71,000 |
Metropolitan Statutory Trust 1 | Junior Subordinated Debentures | Three-month LIBOR |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, description of variable rate basis |  |  |  |  | Three-month LIBOR + 2.79% |  |  |
Interest rate spread |  |  |  |  | 2.79% |  | 2.79% |
RidgeStone Capital Trust I |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  | $ 1,500,000 |
RidgeStone Capital Trust I | Junior Subordinated Debentures |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, maturity date |  |  |  |  | Jun. 30, 2033 |  |  |
Contractual rate |  |  |  |  |  |  | 6.38% |
Accrued interest payable |  |  |  |  |  |  | $ 0 |
Redemption of debentures in whole at par value |  |  |  | $ 1,500,000 |  |  |  |
Other non-interest expense |  |  |  | $ 112,000 |  |  |  |
RidgeStone Capital Trust I | Junior Subordinated Debentures | Five-year LIBOR |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, description of variable rate basis |  |  |  |  | Five-year LIBOR + 3.50% |  |  |
Interest rate spread |  |  |  |  | 3.50% |  | 3.50% |
First Evanston Bancorp Trust I |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Principal amount |  | $ 10,000,000 |  |  | $ 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 |  | 2.03% |  |  | 2.03% |  | 3.67% |
Accrued interest payable |  | $ 9,000 |  |  | $ 9,000 |  | $ 17,000 |
First Evanston Bancorp Trust I | Junior Subordinated Debentures | Three-month LIBOR |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt instrument, description of variable rate basis |  |  |  |  | Three-month LIBOR + 1.78% |  |  |
Interest rate spread |  |  |  |  | 1.78% |  | 1.78% |

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