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Acquisitions (Details) - USD ($)
 12 Months Ended
Dec. 01, 2021
Dec. 31, 2021
Dec. 31, 2020
Liabilities assumed:      
Goodwill   $ 86,332,000 $ 18,604,000
West Suburban Bancorp, Inc      
Assets acquired:      
Cash on due from banks   16,794,000  
Interest bearing deposits with financial institutions   232,880,000  
Securities available-for-sale, at fair value $ 1,070,000,000.00 1,066,373,000  
FHLBC stock   3,340,000  
Loans 1,500,000,000 1,502,118,000  
Premises and equipment   47,456,000  
Other real estate owned   5,552,000  
Core deposit intangible   14,772,000  
Deferred tax assets, net   2,093,000  
Other assets   52,710,000  
Total assets 2,940,000,000 2,944,088,000  
Liabilities assumed:      
Deposits-noninterest bearing demand   409,141,000  
Deposits - Savings, NOW and money market   2,069,890,000  
Deposits-Time   215,205,000  
Total deposits 2,690,000,000 2,694,236,000  
Reserve for unfunded commitments   1,787,000  
Other liabilities   20,629,000  
Total liabilities   2,716,652,000  
Cash consideration paid 100,700,000 100,679,000  
Stock issued for acquisition   194,484,000  
Total Liabilities Assumed and Cash Consideration Paid for Acquisition   3,011,815,000  
Goodwill $ 67,700,000 67,727,000  
Shares issued or issuable 42.413    
Cash consideration for each share $ 271.15    
Merger consideration $ 295,200,000    
Common stock shares issued 15,700,000    
Measurement period 1 year    
Expenses related to acquisition   13,200,000  
Acquisition expenses   $ 25,100,000