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SEGMENT REPORTING & DISCONTINUED OPERATIONS (Information About Reportable Segments and Reconciliation) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |
Net interest income | $ 537,872 | $ 426,691 | $ 279,007
Provision for credit losses | 21,092 | 13,736 | 10,802
Net interest income after provision for credit losses | 516,780 | 412,955 | 268,205
Noninterest income | 132,815 | 104,241 | 62,429
Noninterest expenses | 418,340 | 337,767 | 225,668
Income tax expense (benefit) | (60) | (1,115) | 597
Mortgage | Discontinued Operations |  |  |
Segment Reporting Information [Line Items] |  |  |
Net interest income | 0 | 850 | 1,150
Provision for credit losses | 0 | (185) | (46)
Net interest income after provision for credit losses | 0 | 1,035 | 1,196
Noninterest income | 1 | 3,882 | 9,245
Noninterest expenses | 231 | 9,197 | 9,097
Income before income taxes | (230) | (4,280) | 1,344
Income tax expense (benefit) | (60) | (1,115) | 597
Net income (loss) on discontinued operations | $ (170) | $ (3,165) | $ 747

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