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Business Combinations and Asset Acquisitions (Details)
Loan in Thousands, $ in Thousands
12 Months Ended
Nov. 01, 2019
USD ($)
locations
Oct. 07, 2019
USD ($)
locations
May 24, 2019
USD ($)
locations
Dec. 14, 2018
USD ($)
Aug. 01, 2018
USD ($)
locations
Jan. 04, 2018
USD ($)
Loan
Feb. 14, 2017
USD ($)
Dec. 31, 2019
USD ($)
Dec. 07, 2018
USD ($)
Business Acquisition [Line Items]                  
Goodwill recorded on acquisition               $ 71,189  
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 | locations 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 | locations   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 | locations     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 | locations         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      
AHM                  
Business Acquisition [Line Items]                  
Goodwill recorded on acquisition             $ 1,000