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SEGMENT INFORMATION (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Information about reportable segments [Abstract]      
Net interest income $ 374,412 $ 368,403 $ 359,175
Provision for credit losses (8,839) 14,212 8,430
Noninterest revenue 246,235 228,419 230,619
Amortization of intangible assets 14,051 14,297 15,956
Acquisition expenses 701 4,933 8,608
Acquisition-related contingent consideration adjustment 200 0 0
Other operating expenses 373,186 357,304 347,462
Income before income taxes 241,348 206,076 209,338
Assets 15,552,657 13,931,094 11,410,295
Goodwill 799,109 793,708 773,810
Core deposit intangibles & Other intangibles 65,226 52,940 63,113
Eliminations [Member]      
Information about reportable segments [Abstract]      
Net interest income 0 0 0
Provision for credit losses 0 0 0
Noninterest revenue (7,130) (6,214) (3,006)
Amortization of intangible assets 0 0 0
Acquisition expenses 0 0 0
Acquisition-related contingent consideration adjustment 0    
Other operating expenses (7,130) (6,214) (3,006)
Income before income taxes 0 0 0
Assets (128,345) (131,860) (101,255)
Goodwill 0 0 0
Core deposit intangibles & Other intangibles 0 0 0
Banking [Member] | Operating Segments [Member]      
Information about reportable segments [Abstract]      
Net interest income 374,078 367,237 358,334
Provision for credit losses (8,839) 14,212 8,430
Noninterest revenue 67,910 69,578 75,067
Amortization of intangible assets 4,744 5,515 5,751
Acquisition expenses 638 4,933 8,608
Acquisition-related contingent consideration adjustment 0    
Other operating expenses 265,525 255,955 245,870
Income before income taxes 179,920 156,200 164,742
Assets 15,325,732 13,762,325 11,225,509
Goodwill 689,868 690,121 670,223
Core deposit intangibles & Other intangibles 9,087 13,831 16,418
Employee Benefit Services [Member] | Operating Segments [Member]      
Information about reportable segments [Abstract]      
Net interest income 293 943 665
Provision for credit losses 0 0 0
Noninterest revenue 116,621 103,456 99,483
Amortization of intangible assets 6,033 5,724 6,770
Acquisition expenses 36 0 0
Acquisition-related contingent consideration adjustment 200    
Other operating expenses 64,423 60,709 59,428
Income before income taxes 46,222 37,966 33,950
Assets 257,879 217,780 209,690
Goodwill 85,321 83,275 83,275
Core deposit intangibles & Other intangibles 40,018 32,051 37,775
All Other [Member] | Operating Segments [Member]      
Information about reportable segments [Abstract]      
Net interest income 41 223 176
Provision for credit losses 0 0 0
Noninterest revenue 68,834 61,599 59,075
Amortization of intangible assets 3,274 3,058 3,435
Acquisition expenses 27 0 0
Acquisition-related contingent consideration adjustment 0    
Other operating expenses 50,368 46,854 45,170
Income before income taxes 15,206 11,910 10,646
Assets 97,391 82,849 76,351
Goodwill 23,920 20,312 20,312
Core deposit intangibles & Other intangibles $ 16,121 $ 7,058 $ 8,920