|**Goodwill**                                             | 6 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
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|**Goodwill and Intangible Assets Disclosure [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        
|Goodwill                                                 | GOODWILLGoodwill is recorded on the acquisition date of an entity. The Corporation has one year after the acquisition date, the measurement period, to record subsequent adjustments to goodwill for provisional amounts recorded at the acquisition date. The Level One acquisition on April 1, 2022 resulted in  $167.8 million of goodwill. In addition, the Hoosier acquisition on April, 1, 2021 resulted in $1.5 million of goodwill. Details regarding the Level One and Hoosier acquisitions are discussed in NOTE 2. ACQUISITIONS of these Notes to Consolidated Condensed Financial Statements.2022Balance, January 1$545,385Goodwill acquired167,816Balance, June 30$713,2012021Balance, January 1$543,918Goodwill acquired1,467Balance, December 31$545,385
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|                                                         | 2022                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Balance, January 1                                       | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|Goodwill acquired                                        | 167,816                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                
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|Balance, June 30                                         | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
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|                                                         | 2021                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|Balance, January 1                                       | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
|Goodwill acquired                                        | 1,467                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
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|Balance, December 31                                     | $                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      

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