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SEGMENT INFORMATION (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Jun. 01, 2021
Dec. 31, 2020
Segment Reporting Information, Additional Information [Abstract]            
Net interest income $ 92,611 $ 92,965 $ 278,670 $ 274,970    
Provision for credit losses (944) 1,945 (11,001) 17,313    
Noninterest revenues 64,309 59,659 182,300 171,219    
Amortization of intangible assets 3,703 3,581 10,300 10,772    
Acquisition expenses 102 796 133 4,537    
Other operating expenses 96,631 92,589 276,792 266,223    
Income before income taxes 57,428 53,713 184,746 147,344    
Assets 15,331,098 13,845,325 15,331,098 13,845,325   $ 13,931,094
Goodwill 799,127 793,749 799,127 793,749 $ 5,669 $ 793,708
Core deposit intangibles & Other intangibles 68,977 56,465 68,977 56,465    
Eliminations [Member]            
Segment Reporting Information, Additional Information [Abstract]            
Net interest income 0 0 0 0    
Provision for credit losses 0 0 0 0    
Noninterest revenues (1,745) (1,454) (5,341) (4,347)    
Amortization of intangible assets 0 0 0 0    
Acquisition expenses 0 0 0 0    
Other operating expenses (1,745) (1,454) (5,341) (4,347)    
Income before income taxes 0 0 0 0    
Assets (116,733) (120,877) (116,733) (120,877)    
Goodwill 0 0 0 0    
Core deposit intangibles & Other intangibles 0 0 0 0    
Banking [Member] | Operating Segments [Member]            
Segment Reporting Information, Additional Information [Abstract]            
Net interest income 92,539 92,642 278,411 274,051    
Provision for credit losses (944) 1,945 (11,001) 17,313    
Noninterest revenues 17,696 19,756 50,507 53,428    
Amortization of intangible assets 1,102 1,379 3,666 4,160    
Acquisition expenses 102 796 133 4,537    
Other operating expenses 67,980 67,193 198,145 190,523    
Income before income taxes 41,995 41,085 137,975 110,946    
Assets 15,102,077 13,674,995 15,102,077 13,674,995    
Goodwill 689,868 690,162 689,868 690,162    
Core deposit intangibles & Other intangibles 10,165 15,186 10,165 15,186    
Employee Benefit Services [Member] | Operating Segments [Member]            
Segment Reporting Information, Additional Information [Abstract]            
Net interest income 65 256 224 742    
Provision for credit losses 0 0 0 0    
Noninterest revenues 30,473 25,651 85,616 76,080    
Amortization of intangible assets 1,675 1,409 4,356 4,314    
Acquisition expenses 0 0 0 0    
Other operating expenses 17,212 15,078 47,063 45,157    
Income before income taxes 11,651 9,420 34,421 27,351    
Assets 246,033 210,679 246,033 210,679    
Goodwill 85,336 83,275 85,336 83,275    
Core deposit intangibles & Other intangibles 41,695 33,461 41,695 33,461    
All Other [Member] | Operating Segments [Member]            
Segment Reporting Information, Additional Information [Abstract]            
Net interest income 7 67 35 177    
Provision for credit losses 0 0 0 0    
Noninterest revenues 17,885 15,706 51,518 46,058    
Amortization of intangible assets 926 793 2,278 2,298    
Acquisition expenses 0 0 0 0    
Other operating expenses 13,184 11,772 36,925 34,890    
Income before income taxes 3,782 3,208 12,350 9,047    
Assets 99,721 80,528 99,721 80,528    
Goodwill 23,923 20,312 23,923 20,312    
Core deposit intangibles & Other intangibles $ 17,117 $ 7,818 $ 17,117 $ 7,818