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Acquisition Activity - Purchase Price Summary (Details) - USD ($)
$ in Thousands
Oct. 01, 2019
Mar. 31, 2020
Sep. 30, 2019
Sep. 30, 2018
Business Acquisition [Line Items]        
Goodwill   $ 0 $ 739,023 $ 739,023
Independent Bank        
Business Acquisition [Line Items]        
Total consideration paid $ 4,711      
Goodwill 1,539      
Independent Bank | Customer Relationships Intangible        
Business Acquisition [Line Items]        
Customer relationship intangible $ 3,172