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SEGMENT INFORMATION (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Segment Reporting Information, Additional Information [Abstract]      
Net interest income $ 94,872 $ 93,954  
Provision for credit losses 906 (5,719)  
Noninterest revenues 65,673 58,531  
Amortization of intangible assets 3,732 3,351  
Acquisition expenses 299 27  
Other operating expenses 95,776 89,868  
Income before income taxes 59,832 64,958  
Assets 15,625,883 14,620,181 $ 15,552,657
Goodwill 799,080 793,456 $ 799,109
Core deposit intangibles & Other intangibles 63,958 49,589  
Eliminations [Member]      
Segment Reporting Information, Additional Information [Abstract]      
Net interest income 0 0  
Provision for credit losses 0 0  
Noninterest revenues (2,063) (1,889)  
Amortization of intangible assets 0 0  
Acquisition expenses 0 0  
Other operating expenses (2,063) (1,889)  
Income before income taxes 0 0  
Assets (134,446) (100,024)  
Goodwill 0 0  
Core deposit intangibles & Other intangibles 0 0  
Banking [Member] | Operating Segments [Member]      
Segment Reporting Information, Additional Information [Abstract]      
Net interest income 94,798 93,839  
Provision for credit losses 906 (5,719)  
Noninterest revenues 18,008 16,454  
Amortization of intangible assets 1,045 1,324  
Acquisition expenses 298 27  
Other operating expenses 66,656 65,007  
Income before income taxes 43,901 49,654  
Assets 15,402,218 14,427,834  
Goodwill 689,868 689,869  
Core deposit intangibles & Other intangibles 8,041 12,507  
Employee Benefit Services [Member] | Operating Segments [Member]      
Segment Reporting Information, Additional Information [Abstract]      
Net interest income 68 94  
Provision for credit losses 0 0  
Noninterest revenues 30,188 27,149  
Amortization of intangible assets 1,671 1,354  
Acquisition expenses 1 0  
Other operating expenses 17,597 15,005  
Income before income taxes 10,987 10,884  
Assets 260,166 210,297  
Goodwill 85,292 83,275  
Core deposit intangibles & Other intangibles 38,348 30,697  
All Other [Member] | Operating Segments [Member]      
Segment Reporting Information, Additional Information [Abstract]      
Net interest income 6 21  
Provision for credit losses 0 0  
Noninterest revenues 19,540 16,817  
Amortization of intangible assets 1,016 673  
Acquisition expenses 0 0  
Other operating expenses 13,586 11,745  
Income before income taxes 4,944 4,420  
Assets 97,945 82,074  
Goodwill 23,920 20,312  
Core deposit intangibles & Other intangibles $ 17,569 $ 6,385