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Acquisitions (Details Textuals)
$ in Thousands
3 Months Ended 12 Months Ended
Jun. 30, 2020
USD ($)
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Mar. 01, 2021
USD ($)
Feb. 26, 2021
USD ($)
branch
Dec. 11, 2020
USD ($)
branch
Business Acquisition [Line Items]                
Deposits       $ 29,636,154 $ 28,466,430      
Loans and Leases Receivable, Net Amount       $ 28,486,849 $ 23,944,934      
Monroe, WI [Member]                
Business Acquisition [Line Items]                
purchase premium on deposits             4.00%  
Monroe, WI [Member]                
Business Acquisition [Line Items]                
disposed net branches | branch             1  
Deposits             $ 31,000  
Whitnell                
Business Acquisition [Line Items]                
Disposal Group, Including Discontinued Operation, Consideration           $ 8,000    
Gain (Loss) on Sale and Maturity of Other Investments, Before Tax   $ 2,000            
ABRC [Member]                
Business Acquisition [Line Items]                
Disposal Group, Including Discontinued Operation, Consideration $ 266,000              
Gain (Loss) on Disposition of Intangible Assets $ 163,000   $ 163,000          
Peoria, IL [Member]                
Business Acquisition [Line Items]                
Deposits               $ 180,000
Number of branches sold in disposition | branch               5
Loans and Leases Receivable, Net Amount               $ 0
purchase premium on deposits               4.00%
Southwest Wisconsin [Member]                
Business Acquisition [Line Items]                
Deposits               $ 53,000
Number of branches sold in disposition | branch               2
Loans and Leases Receivable, Net Amount               $ 0
purchase premium on deposits               4.00%