v3.26.1
Subordinated Notes and Junior Subordinated Debentures - Junior Subordinated Debentures by Issuance (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2026
Dec. 31, 2025
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]    
Total liability, at par $ 87,000 $ 87,000
Total liability, at carrying value $ 71,814 71,409
Investment, Variable Interest Rate, Type [Extensible Enumeration] Three Month SOFR and Spread Adjustment [Member]  
Metropolitan Statutory Trust 1    
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]    
Total liability, at par [1] $ 35,000 35,000
First Evanston Bancorp Trust I    
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]    
Total liability, at par [2] 10,000 10,000
AmeriMark Capital Trust I    
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]    
Total liability, at par [3] 5,000 5,000
Inland Bancorp Trust II    
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]    
Total liability, at par [3] 10,000 10,000
Inland Bancorp Trust III    
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]    
Total liability, at par [3] 10,000 10,000
Inland Bancorp Trust IV    
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]    
Total liability, at par [3] 7,000 7,000
Inland Bancorp Trust V    
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]    
Total liability, at par [3] 10,000 10,000
Junior Subordinated Debentures    
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]    
Discount $ (15,186) $ (15,591)
Junior Subordinated Debentures | Metropolitan Statutory Trust 1    
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]    
Stated Maturity [1] Mar. 17, 2034  
Contractual Rate [1] 6.72%  
Interest Rate Spread, Description [1],[4] SOFR + spread adjustment + 2.79%  
Interest Rate Spread [1],[4] 2.79%  
Junior Subordinated Debentures | First Evanston Bancorp Trust I    
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]    
Stated Maturity [2] Mar. 15, 2035  
Contractual Rate [2] 5.71%  
Interest Rate Spread, Description [2],[4] SOFR + spread adjustment + 1.78%  
Interest Rate Spread [2],[4] 1.78%  
Junior Subordinated Debentures | AmeriMark Capital Trust I    
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]    
Stated Maturity [3] Apr. 23, 2034  
Contractual Rate [3] 6.68%  
Interest Rate Spread, Description [3],[4] SOFR + spread adjustment + 2.75%  
Interest Rate Spread [3],[4] 2.75%  
Junior Subordinated Debentures | Inland Bancorp Trust II    
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]    
Stated Maturity [3] Sep. 15, 2035  
Contractual Rate [3] 5.53%  
Interest Rate Spread, Description [3],[4] SOFR + spread adjustment + 1.60%  
Interest Rate Spread [3],[4] 1.60%  
Junior Subordinated Debentures | Inland Bancorp Trust III    
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]    
Stated Maturity [3] Dec. 15, 2036  
Contractual Rate [3] 5.58%  
Interest Rate Spread, Description [3],[4] SOFR + spread adjustment + 1.65%  
Interest Rate Spread [3],[4] 1.65%  
Junior Subordinated Debentures | Inland Bancorp Trust IV    
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]    
Stated Maturity [3] Jun. 06, 2037  
Contractual Rate [3] 5.53%  
Interest Rate Spread, Description [3],[4] SOFR + spread adjustment + 1.62%  
Interest Rate Spread [3],[4] 1.62%  
Junior Subordinated Debentures | Inland Bancorp Trust V    
Shares Subject To Mandatory Redemption By Settlement Terms [Line Items]    
Stated Maturity [3] Sep. 15, 2037  
Contractual Rate [3] 5.35%  
Interest Rate Spread, Description [3],[4] SOFR + spread adjustment + 1.42%  
Interest Rate Spread [3],[4] 1.42%  
[1] Assumed as part of the Company's recapitalization of its predecessor.
[2] Assumed in May 2018 as part of an acquisition.
[3] Assumed in July 2023 as part of an acquisition
[4] SOFR is three-month SOFR and the spread adjustment is 0.26161%