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Subordinated Notes and Junior Subordinated Debentures - Junior Subordinated Debentures by Issuance (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]    
Total liability, at par $ 45,000 $ 45,000
Total liability, at carrying value 36,796 36,451
Metropolitan Statutory Trust 1    
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]    
Total liability, at par 35,000 35,000
First Evanston Bancorp Trust I    
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]    
Total liability, at par 10,000 10,000
Junior Subordinated Debentures    
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]    
Discount $ (8,204) $ (8,549)
Junior Subordinated Debentures | Metropolitan Statutory Trust 1    
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]    
Stated Maturity Mar. 17, 2034  
Contractual Rate 2.91% 3.02%
Junior Subordinated Debentures | Metropolitan Statutory Trust 1 | Three-month LIBOR    
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]    
Interest Rate Spread, Description Three-monthLIBOR + 2.79%  
Interest Rate Spread 2.79% 2.79%
Junior Subordinated Debentures | First Evanston Bancorp Trust I    
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]    
Stated Maturity Mar. 15, 2035  
Contractual Rate 1.90% 2.00%
Junior Subordinated Debentures | First Evanston Bancorp Trust I | Three-month LIBOR    
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]    
Interest Rate Spread, Description Three-monthLIBOR + 1.78%  
Interest Rate Spread 1.78% 1.78%