Subordinated Notes and Junior Subordinated Debentures - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Principal amount	$ 45,000	$ 45,000
Accrued interest payable	$ 262	1,478
Fixed-To-Floating Subordinate Notes Mature on July 1, 2030 | Subordinated Notes
Debt Instrument [Line Items]
Debt instrument, face amount		$ 75,000
Debt instrument, interest rate		6.00%
Debt instrument, maturity date		Jul. 01, 2030
Debt instrument, redemption, description	As of December 31, 2021 and 2020, the liability outstanding relating to the subordinated notes, net of unamortized debt issuance costs, was $73.5 million and $73.3 million, respectively. 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 FRB to the extent such approval is then required.	As of December 31, 2021 and 2020, the liability outstanding relating to the subordinated notes, net of unamortized debt issuance costs, was $73.5 million and $73.3 million, respectively. 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 FRB to the extent such approval is then required.
Debt issuance costs		$ 1,700
Debt issuance costs, amortization period		10 years
Unamortized debt issuance costs	$ 73,500	$ 73,300
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	$ 35,000
Metropolitan Statutory Trust 1 | Junior Subordinated Debentures
Debt Instrument [Line Items]
Debt instrument, maturity date	Mar. 17, 2034
Contractual rate	3.01%	3.02%
Accrued interest payable	$ 45,000	$ 45,000
Metropolitan Statutory Trust 1 | Junior Subordinated Debentures | Three-month LIBOR
Debt Instrument [Line Items]
Debt instrument, description of variable rate basis	Three-month LIBOR + 2.79%
Interest rate spread		2.79%
First Evanston Bancorp Trust I
Debt Instrument [Line Items]
Principal amount	$ 10,000	$ 10,000
First Evanston Bancorp Trust I | Junior Subordinated Debentures
Debt Instrument [Line Items]
Debt instrument, maturity date	Mar. 15, 2035
Contractual rate	1.98%	2.00%
Accrued interest payable	$ 9,000	$ 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-month LIBOR + 1.78%
Interest rate spread		1.78%