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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

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