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Merger Transaction - Narrative (Details) - USD ($)
$ in Thousands
Nov. 07, 2019
Jun. 30, 2020
Dec. 31, 2019
Business Acquisition [Line Items]      
Goodwill   $ 13,072 $ 12,942
Premier Bancsares, Inc.      
Business Acquisition [Line Items]      
Interest acquired 100.00%    
Payments to acquire businesses $ 43,400    
Goodwill 9,599    
Intangible assets $ 4,213