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Business Combinations (Details)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2022
USD ($)
$ / shares
shares
Sep. 30, 2021
USD ($)
banking_office
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Business Acquisition [Line Items]        
Number of banking offices | banking_office   64    
Assets   $ 5,475,750 $ 4,977,577  
Loans   3,012,989 3,091,998 $ 3,081,973
Deposits   4,592,951 $ 4,106,530  
CUB | Subsequent Event | Forecast        
Business Acquisition [Line Items]        
Cash paid for acquisition $ 49,813      
Cash payment in cancellation of unexercised stock options $ 918      
CUB | Common Stock | Subsequent Event | Forecast        
Business Acquisition [Line Items]        
Fixed exchange ratio (in shares) | shares 0.7739      
Cash payment for each share exchanged (USD per share) | $ / shares $ 13.44      
Shares issued for acquisition (in shares) | shares 2,900,000      
CUB | CUB        
Business Acquisition [Line Items]        
Assets   1,074,000    
Loans   716,400    
Deposits   $ 889,200    
Kentucky | CUB | CUB        
Business Acquisition [Line Items]        
Number of banking offices | banking_office   15