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Mergers and Acquisitions - Pro forma information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]      
Supplemental consolidated pro forma Revenue $ 563,872 $ 539,152 $ 495,052
Supplemental consolidated pro forma Net Income 187,124 171,218 78,958
FMBT      
Business Acquisition [Line Items]      
Actual Revenue 7,525    
Actual Net income $ 4,053    
Navitas      
Business Acquisition [Line Items]      
Actual Revenue   24,285  
Actual Net income   $ 7,149  
FOFN      
Business Acquisition [Line Items]      
Actual Revenue     5,265
Actual Net income     1,406
HCSB      
Business Acquisition [Line Items]      
Actual Revenue     5,775
Actual Net income     $ 1,385