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Junior Subordinated Debentures - Junior Subordinated Debentures by Issuance (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Mar. 31, 2018
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]      
Total liability, at par $ 46,500 $ 36,500  
Total liability, at carrying value 36,615 27,647  
Metropolitan Statutory Trust 1      
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]      
Total liability, at par 35,000 35,000  
RidgeStone Capital Trust I      
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]      
Total liability, at par 1,500 1,500 $ 1,500
First Evanston Bancorp Trust I      
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]      
Total liability, at par 10,000    
Junior Subordinated Debentures      
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]      
Discount $ (9,885) $ (8,853)  
Junior Subordinated Debentures | Metropolitan Statutory Trust 1      
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]      
Stated Maturity Mar. 17, 2034    
Contractual Rate 5.12% 4.39%  
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-month LIBOR    
Interest Rate Spread 2.79% 2.79%  
Junior Subordinated Debentures | RidgeStone Capital Trust I      
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]      
Stated Maturity Jun. 30, 2033    
Contractual Rate 6.38% 5.09%  
Junior Subordinated Debentures | RidgeStone Capital Trust I | Five-year LIBOR      
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]      
Interest Rate Spread, Description Five-year LIBOR    
Interest Rate Spread 3.50% 3.50%  
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 4.11%    
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-month LIBOR    
Interest Rate Spread 1.78%