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Other Liabilities Held for Sale (Details)
9 Months Ended
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Mar. 12, 2021
USD ($)
branch
Business Acquisition [Line Items]      
Gain on sale of business $ 5,300,000 $ 8,100,000  
Disposal Group, Held-for-sale, Not Discontinued Operations      
Business Acquisition [Line Items]      
Other liabilities held-for-sale 0    
Disposal Group, Held-for-sale, Not Discontinued Operations | Illinois Branches      
Business Acquisition [Line Items]      
Number of branches sold | branch     4
Loans held for sale     $ 354,000
Deposits held for sale     $ 137,900,000
Gain on sale of business $ 5,300,000