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Business Combinations and Asset Acquisitions (Details)
loan in Thousands, $ in Thousands
12 Months Ended
Nov. 01, 2019
USD ($)
location
Oct. 07, 2019
USD ($)
location
May 24, 2019
USD ($)
location
Dec. 14, 2018
USD ($)
Aug. 01, 2018
USD ($)
location
Jan. 04, 2018
USD ($)
loan
Dec. 31, 2020
USD ($)
Dec. 07, 2018
USD ($)
Business Acquisition [Line Items]                
Goodwill recorded on acquisition             $ 0  
AEB                
Business Acquisition [Line Items]                
Asset acquisition, assets acquired               $ 164,000
Asset acquisition, loans acquired               119,300
Asset acquisition, deposits acquired               $ 150,800
SBC                
Business Acquisition [Line Items]                
Number of locations acquired | location 6              
Business combination, assets acquired $ 619,800              
Business combination, loans acquired 423,000              
Business combination, deposits assumed 507,800              
Goodwill recorded on acquisition $ 40,300              
STC                
Business Acquisition [Line Items]                
Number of locations acquired | location   5            
Business combination, assets acquired   $ 250,100            
Business combination, loans acquired   174,300            
Business combination, deposits assumed   201,200            
Goodwill recorded on acquisition   $ 19,100            
ROC                
Business Acquisition [Line Items]                
Number of locations acquired | location     1          
Business combination, assets acquired     $ 223,400          
Business combination, loans acquired     124,700          
Business combination, deposits assumed     161,200          
Goodwill recorded on acquisition     $ 11,700          
CSC                
Business Acquisition [Line Items]                
Number of locations acquired | location         1      
Business combination, assets acquired         $ 282,800      
Business combination, loans acquired         152,700      
Business combination, deposits assumed         213,100      
Goodwill recorded on acquisition         $ 26,600      
Elektra                
Business Acquisition [Line Items]                
Goodwill recorded on acquisition       $ 37,300        
Veterans First                
Business Acquisition [Line Items]                
Goodwill recorded on acquisition           $ 9,100    
Business combination, number of loans acquired with mortgage-servicing rights | loan           10    
Business combination, unpaid principal balance of loans acquired with mortgage-servicing rights           $ 1,600,000