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Business Combinations, Goodwill and Intangible Assets (Narrative) (Details)
 12 Months Ended
Jan. 01, 2022
USD ($)
bankingOffice
$ / shares
shares
Dec. 31, 2023
USD ($)
bankingOffice
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
bankingOffice
Dec. 31, 2020
USD ($)
Business Acquisition [Line Items]          
Number of banking offices | bankingOffice   76      
Total Assets   $ 6,152,198,000 $ 6,155,991,000 $ 5,608,539,000  
Loans   3,977,900,000 3,788,645,000    
Goodwill   180,357,000 180,357,000 121,761,000 $ 121,956,000
Allowance for credit losses   43,765,000 44,168,000 37,017,000 $ 46,859,000
Decrease in goodwill attributable to sale of branches       195,000  
Goodwill impairment   0 0 0  
Amortization of expense intangible assets   2,840,000 3,711,000 $ 2,731,000  
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Brank Branches          
Business Acquisition [Line Items]          
Number of branches sold (in banking offices) | bankingOffice       2  
Core Banking          
Business Acquisition [Line Items]          
Goodwill   179,025,000 179,025,000 $ 120,429,000  
Insurance          
Business Acquisition [Line Items]          
Goodwill   1,332,000 $ 1,332,000 $ 1,332,000  
Citizens Union Bancorp of Shelbyville, Inc. ("CUB")          
Business Acquisition [Line Items]          
Direct acquisition costs $ 12,323,000        
Goodwill 58,596,000        
Intangible Assets 7,572,000        
Cash paid 50,800,000        
Merger related costs   12,323,000      
Citizens Union Bancorp of Shelbyville, Inc. ("CUB") | Adjustment          
Business Acquisition [Line Items]          
Allowance for credit losses   $ 6,300,000      
Citizens Union Bancorp of Shelbyville, Inc. ("CUB") | Loans acquired with deteriorated credit quality          
Business Acquisition [Line Items]          
Business Combination, Acquired Receivable, Fair Value 29,868,000        
Business Combination, Acquired Receivables, Gross Contractual Amount 34,453,000        
Estimated contractual cash flows of purchased financial asset with credit deterioration $ 3,117,000        
Citizens Union Bancorp of Shelbyville, Inc. ("CUB") | Common Stock          
Business Acquisition [Line Items]          
Cash payment for each share exchanged (in dollars per share) | $ / shares $ 13.44        
Fixed exchange ratio (in shares) | shares 0.7739        
Shares of common stock issued for acquisition (in shares) | shares 2,870,975        
Citizens Union Bancorp of Shelbyville, Inc. ("CUB") | Core Deposit Intangible          
Business Acquisition [Line Items]          
Intangible Assets $ 7,572,000        
Weighted average useful live of intangibles 8 years        
Citizens Union Bancorp of Shelbyville, Inc. ("CUB")          
Business Acquisition [Line Items]          
Number of banking offices | bankingOffice 15        
Citizens Union Bancorp of Shelbyville, Inc. ("CUB") | Citizens Union Bancorp of Shelbyville, Inc. ("CUB")          
Business Acquisition [Line Items]          
Total Assets $ 1,108,546,000        
Loans 683,807,000        
Deposits $ 930,533,000