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Acquisition (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 01, 2021
Mar. 31, 2022
Dec. 31, 2021
Liabilities assumed:      
Goodwill   $ 86,332,000 $ 86,332,000
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 1,066,373,000    
FHLBC stock 3,340,000    
Loans, net of allowance for credit losses Day One PCD loan adjustment 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 2,944,088,000    
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 2,694,236,000    
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 $ 67,727,000    
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    
Expenses related to acquisition   $ 5,600,000 $ 13,200,000