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SEGMENT INFORMATION (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Information about reportable segments [Abstract]      
Net interest income $ 84,624 $ 67,274  
Provision for loan losses 3,679 1,828  
Noninterest revenues 57,491 44,318  
Amortization of intangible assets 4,798 2,768  
Acquisition expenses (8) 1,716  
Other operating expenses 81,541 69,091  
Income before income taxes 52,105 36,189  
Assets 10,966,555 8,913,860 $ 10,746,198
Goodwill 733,625 542,986 $ 734,430
Eliminations [Member]      
Information about reportable segments [Abstract]      
Net interest income 0 0  
Provision for loan losses 0 0  
Noninterest revenues (695) (664)  
Amortization of intangible assets 0 0  
Acquisition expenses 0 0  
Other operating expenses (695) (664)  
Income before income taxes 0 0  
Assets (43,539) (43,145)  
Goodwill 0 0  
Banking [Member] | Operating Segments [Member]      
Information about reportable segments [Abstract]      
Net interest income 84,530 67,134  
Provision for loan losses 3,679 1,828  
Noninterest revenues 20,357 15,867  
Amortization of intangible assets 1,744 554  
Acquisition expenses (15) 521  
Other operating expenses 56,955 49,493  
Income before income taxes 42,524 30,605  
Assets 10,736,383 8,663,042  
Goodwill 629,916 440,870  
Employee Benefit Services [Member] | Operating Segments [Member]      
Information about reportable segments [Abstract]      
Net interest income 70 78  
Provision for loan losses 0 0  
Noninterest revenues 23,449 17,636  
Amortization of intangible assets 2,088 1,591  
Acquisition expenses 7 1,062  
Other operating expenses 13,709 11,370  
Income before income taxes 7,715 3,691  
Assets 205,544 221,437  
Goodwill 83,275 84,213  
All Other [Member] | Operating Segments [Member]      
Information about reportable segments [Abstract]      
Net interest income 24 62  
Provision for loan losses 0 0  
Noninterest revenues 14,380 11,479  
Amortization of intangible assets 966 623  
Acquisition expenses 0 133  
Other operating expenses 11,572 8,892  
Income before income taxes 1,866 1,893  
Assets 68,167 72,526  
Goodwill $ 20,434 $ 17,903