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Acquisition (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 01, 2021
Sep. 30, 2022
Sep. 30, 2022
Dec. 31, 2021
Liabilities assumed:        
Goodwill   $ 86,478,000 $ 86,478,000 $ 86,332,000
West Suburban Bancorp, Inc        
Assets acquired:        
Cash and due from banks $ 16,794,000      
Interest bearing deposits with financial institutions 232,880,000      
Securities available-for-sale and held-to maturity, at fair value 1,067,517,000      
FHLBC stock 3,340,000      
Loans, net of allowance for credit losses Day One PCD loan adjustment 1,500,974,000      
Premises and equipment 47,456,000      
Other real estate owned 5,552,000      
Core deposit intangible 14,772,000      
Deferred tax assets, net 5,819,000      
Other assets 48,838,000      
Total assets 2,943,942,000      
Liabilities assumed:        
Noninterest bearing demand 1,070,980,000      
Savings, NOW and money market 1,408,051,000      
Time 215,205,000      
Total deposits 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 100,679,000      
Stock issued for acquisition 194,484,000      
Total Liabilities Assumed and Cash Consideration Paid for Acquisition 3,011,815,000      
Goodwill $ 67,873,000      
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      
Increase decrease in deferred tax assets   3,700,000    
Decrease in current taxes receivable   3,900,000    
Increase to goodwill   146,000    
Expenses related to acquisition   $ 650,000,000,000 $ 9,500,000 $ 13,200,000