Subordinated Notes and Junior Subordinated Debentures - Additional Information (Details) - USD ($) $ in Thousands			3 Months Ended
	Sep. 15, 2023	Sep. 14, 2023	Mar. 31, 2024	Dec. 31, 2023	Dec. 31, 2020
Debt Instrument [Line Items]
Principal amount			$ 87,000	$ 87,000
Three-Month CME Secured Overnight Financing Rate Plus Tenor Spread Adjustment
Debt Instrument [Line Items]
Adjustment spread Interest rate			0.26161%
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 March 31, 2024, the net liability outstanding of the subordinated notes was $73.9 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
Debt issuance costs, amortization period			10 years
Loans			$ 73,900
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 SOFR, 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			8.38%	8.43%
Metropolitan Statutory Trust 1 | Junior Subordinated Debentures | Three-Month CME Secured Overnight Financing Rate Plus Tenor Spread Adjustment
Debt Instrument [Line Items]
Interest rate spread			2.79%
Adjustment spread Interest rate		0.26161%
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			7.37%	7.43%
First Evanston Bancorp Trust I | Junior Subordinated Debentures | Three-Month CME Secured Overnight Financing Rate Plus Tenor Spread Adjustment
Debt Instrument [Line Items]
Interest rate spread			1.78%
Adjustment spread Interest rate	0.26161%
AmeriMark Capital Trust I
Debt Instrument [Line Items]
Principal amount			$ 5,000	$ 5,000
AmeriMark Capital Trust I | Junior Subordinated Debentures
Debt Instrument [Line Items]
Debt instrument, maturity date			Apr. 23, 2034
Contractual rate			8.33%