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ACQUISITIONS (Details) - USD ($)
$ / shares in Units, $ in Thousands
Nov. 30, 2019
May 10, 2019
Jun. 30, 2020
Jun. 09, 2020
Feb. 11, 2020
Dec. 31, 2019
Business Acquisition [Line Items]            
Deposits acquired     $ 12,708,699     $ 11,044,331
Gross loans held to maturity     9,246,830     8,367,917
Number of shares issued In exchange per share (in shares)         $ 207.0  
Assets acquired     15,026,153     $ 13,209,597
AIM Bancshares, Inc.            
Business Acquisition [Line Items]            
Share price (USD per share)         $ 685.00  
Blue Valley Ban Corp.            
Business Acquisition [Line Items]            
Share price (USD per share)   $ 44.78        
Consideration paid   $ 92,300        
Purchase price paid by delivery of shares of common stock (in shares)   2,060,258        
Outstanding debt repaid   $ 6,900        
Johnson Bank Branches            
Business Acquisition [Line Items]            
Deposits acquired       $ 415,300    
Gross loans held to maturity       $ 168,100    
AIM Bancshares, Inc.            
Business Acquisition [Line Items]            
Deposits acquired     1,690,000      
Gross loans held to maturity     1,190,000      
Assets acquired     $ 1,950,000      
Rockford Bank And Trust Company            
Business Acquisition [Line Items]            
Deposits acquired $ 430,300          
Gross loans held to maturity 354,000          
Assets acquired 495,700          
Purchase price in cash $ 46,600          
Blue Valley Ban Corp.            
Business Acquisition [Line Items]            
Deposits acquired   617,100        
Gross loans held to maturity   542,000        
Assets acquired   766,200        
Trust Preferred Securities Subject to Mandatory Redemption | Blue Valley Ban Corp.            
Business Acquisition [Line Items]            
Trust preferred securities assumed   $ 16,100