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SEGMENT INFORMATION (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019 | Jul. 12, 2019
Information about reportable segments [Abstract] |  |  |  |  |  |
Net interest income | $ 92,965 | $ 91,276 | $ 274,970 | $ 266,435 |  |
Provision for credit losses | 1,945 | 1,751 | 17,313 | 5,573 |  |
Noninterest revenues | 59,659 | 57,094 | 171,219 | 173,496 |  |
Amortization of intangible assets | 3,581 | 3,960 | 10,772 | 11,994 |  |
Acquisition expenses | 796 | 6,061 | 4,537 | 7,789 |  |
Other operating expenses | 92,589 | 86,908 | 266,223 | 256,974 |  |
Income before income taxes | 53,713 | 49,690 | 147,344 | 157,601 |  |
Assets | 13,845,325 | 11,597,297 | 13,845,325 | 11,597,297 | $ 11,410,295 |
Goodwill | 793,749 | 773,610 | 793,749 | 773,610 | $ 773,810 | $ 39,970
Core deposit intangibles & Other intangibles | 56,465 | 67,075 | 56,465 | 67,075 |  |
Eliminations [Member] |  |  |  |  |  |
Information about reportable segments [Abstract] |  |  |  |  |  |
Net interest income | 0 | 0 | 0 | 0 |  |
Provision for credit losses | 0 | 0 | 0 | 0 |  |
Noninterest revenues | (1,454) | (669) | (4,347) | (2,231) |  |
Amortization of intangible assets | 0 | 0 | 0 | 0 |  |
Acquisition expenses | 0 | 0 | 0 | 0 |  |
Other operating expenses | (1,454) | (669) | (4,347) | (2,231) |  |
Income before income taxes | 0 | 0 | 0 | 0 |  |
Assets | (120,877) | (76,505) | (120,877) | (76,505) |  |
Goodwill | 0 | 0 | 0 | 0 |  |
Core deposit intangibles & Other intangibles | 0 | 0 | 0 | 0 |  |
Banking [Member] | Operating Segments [Member] |  |  |  |  |  |
Information about reportable segments [Abstract] |  |  |  |  |  |
Net interest income | 92,642 | 91,018 | 274,051 | 265,860 |  |
Provision for credit losses | 1,945 | 1,751 | 17,313 | 5,573 |  |
Noninterest revenues | 19,756 | 17,790 | 53,428 | 57,059 |  |
Amortization of intangible assets | 1,379 | 1,439 | 4,160 | 4,297 |  |
Acquisition expenses | 796 | 6,061 | 4,537 | 7,789 |  |
Other operating expenses | 67,193 | 61,839 | 190,523 | 182,186 |  |
Income before income taxes | 41,085 | 37,718 | 110,946 | 123,074 |  |
Assets | 13,674,995 | 11,398,191 | 13,674,995 | 11,398,191 |  |
Goodwill | 690,162 | 670,023 | 690,162 | 670,023 |  |
Core deposit intangibles & Other intangibles | 15,186 | 17,872 | 15,186 | 17,872 |  |
Employee Benefit Services [Member] | Operating Segments [Member] |  |  |  |  |  |
Information about reportable segments [Abstract] |  |  |  |  |  |
Net interest income | 256 | 209 | 742 | 448 |  |
Provision for credit losses | 0 | 0 | 0 | 0 |  |
Noninterest revenues | 25,651 | 24,830 | 76,080 | 73,919 |  |
Amortization of intangible assets | 1,409 | 1,667 | 4,314 | 5,105 |  |
Acquisition expenses | 0 | 0 | 0 | 0 |  |
Other operating expenses | 15,078 | 14,721 | 45,157 | 43,985 |  |
Income before income taxes | 9,420 | 8,651 | 27,351 | 25,277 |  |
Assets | 210,679 | 201,442 | 210,679 | 201,442 |  |
Goodwill | 83,275 | 83,275 | 83,275 | 83,275 |  |
Core deposit intangibles & Other intangibles | 33,461 | 39,440 | 33,461 | 39,440 |  |
All Other [Member] | Operating Segments [Member] |  |  |  |  |  |
Information about reportable segments [Abstract] |  |  |  |  |  |
Net interest income | 67 | 49 | 177 | 127 |  |
Provision for credit losses | 0 | 0 | 0 | 0 |  |
Noninterest revenues | 15,706 | 15,143 | 46,058 | 44,749 |  |
Amortization of intangible assets | 793 | 854 | 2,298 | 2,592 |  |
Acquisition expenses | 0 | 0 | 0 | 0 |  |
Other operating expenses | 11,772 | 11,017 | 34,890 | 33,034 |  |
Income before income taxes | 3,208 | 3,321 | 9,047 | 9,250 |  |
Assets | 80,528 | 74,169 | 80,528 | 74,169 |  |
Goodwill | 20,312 | 20,312 | 20,312 | 20,312 |  |
Core deposit intangibles & Other intangibles | $ 7,818 | $ 9,763 | $ 7,818 | $ 9,763 |  |

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