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SEGMENT INFORMATION (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Segment Reporting Information, Additional Information [Abstract]      
Net interest income $ 93,954 $ 90,054  
Provision for credit losses (5,719) 5,594  
Noninterest revenues 58,531 58,622  
Amortization of intangible assets 3,351 3,667  
Acquisition expenses 27 369  
Other operating expenses 89,868 89,627  
Income before income taxes 64,958 49,419  
Assets 14,620,181 11,808,983 $ 13,931,094
Goodwill 793,456 773,473 $ 793,708
Core deposit intangibles & Other intangibles 49,589 59,446  
Eliminations [Member]      
Segment Reporting Information, Additional Information [Abstract]      
Net interest income 0 0  
Provision for credit losses 0 0  
Noninterest revenues (1,889) (1,519)  
Amortization of intangible assets 0 0  
Acquisition expenses 0 0  
Other operating expenses (1,889) (1,519)  
Income before income taxes 0 0  
Assets (100,024) (114,640)  
Goodwill 0 0  
Core deposit intangibles & Other intangibles 0 0  
Banking [Member] | Operating Segments [Member]      
Segment Reporting Information, Additional Information [Abstract]      
Net interest income 93,839 89,763  
Provision for credit losses (5,719) 5,594  
Noninterest revenues 16,454 18,680  
Amortization of intangible assets 1,324 1,417  
Acquisition expenses 27 369  
Other operating expenses 65,007 64,200  
Income before income taxes 49,654 36,863  
Assets 14,427,834 11,633,330  
Goodwill 689,869 669,886  
Core deposit intangibles & Other intangibles 12,507 15,001  
Employee Benefit Services [Member] | Operating Segments [Member]      
Segment Reporting Information, Additional Information [Abstract]      
Net interest income 94 240  
Provision for credit losses 0 0  
Noninterest revenues 27,149 25,925  
Amortization of intangible assets 1,354 1,494  
Acquisition expenses 0 0  
Other operating expenses 15,005 15,130  
Income before income taxes 10,884 9,541  
Assets 210,297 213,768  
Goodwill 83,275 83,275  
Core deposit intangibles & Other intangibles 30,697 36,281  
All Other [Member] | Operating Segments [Member]      
Segment Reporting Information, Additional Information [Abstract]      
Net interest income 21 51  
Provision for credit losses 0 0  
Noninterest revenues 16,817 15,536  
Amortization of intangible assets 673 756  
Acquisition expenses 0 0  
Other operating expenses 11,745 11,816  
Income before income taxes 4,420 3,015  
Assets 82,074 76,525  
Goodwill 20,312 20,312  
Core deposit intangibles & Other intangibles $ 6,385 $ 8,164