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SEGMENT INFORMATION (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Jul. 12, 2019
Information about reportable segments [Abstract]        
Net interest income $ 90,054 $ 86,859    
Provision for credit losses 5,594 2,422    
Noninterest revenues 58,622 55,696    
Amortization of intangible assets 3,667 4,130    
Acquisition expenses 369 534    
Other operating expenses 89,627 83,988    
Income before income taxes 49,419 51,481    
Assets 11,808,983 10,916,467 $ 11,410,295  
Goodwill 773,473 733,503 $ 773,810 $ 39,970
Core deposit intangibles & Other intangibles 59,446 70,916    
Eliminations [Member]        
Information about reportable segments [Abstract]        
Net interest income 0 0    
Provision for credit losses 0 0    
Noninterest revenues (1,519) (769)    
Amortization of intangible assets 0 0    
Acquisition expenses 0 0    
Other operating expenses (1,519) (769)    
Income before income taxes 0 0    
Assets (114,640) (53,309)    
Goodwill 0 0    
Core deposit intangibles & Other intangibles 0 0    
Banking [Member] | Operating Segments [Member]        
Information about reportable segments [Abstract]        
Net interest income 89,763 86,715    
Provision for credit losses 5,594 2,422    
Noninterest revenues 18,680 17,348    
Amortization of intangible assets 1,417 1,483    
Acquisition expenses 369 534    
Other operating expenses 64,200 59,769    
Income before income taxes 36,863 39,855    
Assets 11,633,330 10,699,384    
Goodwill 669,886 629,916    
Core deposit intangibles & Other intangibles 15,001 17,113    
Employee Benefit Services [Member] | Operating Segments [Member]        
Information about reportable segments [Abstract]        
Net interest income 240 108    
Provision for credit losses 0 0    
Noninterest revenues 25,925 24,670    
Amortization of intangible assets 1,494 1,769    
Acquisition expenses 0 0    
Other operating expenses 15,130 14,279    
Income before income taxes 9,541 8,730    
Assets 213,768 199,345    
Goodwill 83,275 83,275    
Core deposit intangibles & Other intangibles 36,281 42,777    
All Other [Member] | Operating Segments [Member]        
Information about reportable segments [Abstract]        
Net interest income 51 36    
Provision for credit losses 0 0    
Noninterest revenues 15,536 14,447    
Amortization of intangible assets 756 878    
Acquisition expenses 0 0    
Other operating expenses 11,816 10,709    
Income before income taxes 3,015 2,896    
Assets 76,525 71,047    
Goodwill 20,312 20,312    
Core deposit intangibles & Other intangibles $ 8,164 $ 11,026