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SEGMENT REPORTING AND REVENUE (Operating Segment Results) (Details) $ in Thousands |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 01, 2023 USD ($) | Dec. 31, 2024 USD ($) segment | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Jun. 30, 2024 USD ($) | Apr. 01, 2024 USD ($)
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Reallocation of noninterest income from Consumer Banking to Wholesale Banking |  |  |  | $ 12,500 |  |
Reallocation of noninterest expense from Consumer Banking to Wholesale Banking |  |  |  | 16,000 |  |
Number of operating segments | segment |  | 2 |  |  |  |
Interest income |  | $ 1,227,535 | $ 954,450 | 660,435 |  |
Interest expense |  | 528,996 | 343,437 | 76,174 |  |
Net interest income |  | 698,539 | 611,013 | 584,261 |  |
Provision for credit losses |  | 50,089 | 31,618 | 19,028 |  |
Net interest income after provision for credit losses |  | 648,450 | 579,395 | 565,233 |  |
Noninterest income |  | 118,878 | 90,877 | 118,523 |  |
Noninterest expenses |  | 507,534 | 430,371 | 403,802 |  |
Income (loss) before income taxes |  | 259,794 | 239,901 | 279,954 |  |
LHFI, net of deferred fees and costs |  | 18,470,621 | 15,635,043 |  |  |
Goodwill |  | 1,214,053 | 925,211 |  |  |
Deposits |  | 20,397,619 | 16,818,129 |  |  |
Gain on sale of DHFB |  | 0 | 0 | 9,082 |  |
Goodwill |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Reallocation of goodwill from Consumer Banking to Wholesale Banking | $ 9,600 |  |  |  |  |
American National |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Goodwill |  | 288,842 | 0 |  |  | $ 288,842
Wholesale Banking | American National |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Goodwill |  | 210,800 |  |  |  |
Consumer Banking | American National |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Goodwill |  | 78,000 |  |  |  |
Operating segments | Wholesale Banking |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Interest income |  | 1,222,101 | 934,242 | 540,076 |  |
Interest expense |  | 844,408 | 663,257 | 238,273 |  |
Net interest income |  | 377,693 | 270,985 | 301,803 |  |
Provision for credit losses |  | 40,072 | 34,229 | 11,758 |  |
Net interest income after provision for credit losses |  | 337,621 | 236,756 | 290,045 |  |
Noninterest income |  | 44,811 | 36,791 | 36,557 |  |
Noninterest expenses |  | 194,704 | 164,283 | 158,159 |  |
Income (loss) before income taxes |  | 187,728 | 109,264 | 168,443 |  |
LHFI, net of deferred fees and costs |  | 15,514,640 | 12,688,833 |  |  |
Goodwill |  | 850,035 | 639,180 |  |  |
Deposits |  | 7,193,403 | 6,403,432 |  |  |
Operating segments | Wholesale Banking | American National |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Goodwill |  |  |  |  | $ 210,800 |
Operating segments | Consumer Banking |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Interest income |  | 619,855 | 452,388 | 300,722 |  |
Interest expense |  | 318,839 | 198,542 | 77,935 |  |
Net interest income |  | 301,016 | 253,846 | 222,787 |  |
Provision for credit losses |  | 10,029 | (2,616) | 7,231 |  |
Net interest income after provision for credit losses |  | 290,987 | 256,462 | 215,556 |  |
Noninterest income |  | 59,344 | 51,347 | 56,899 |  |
Noninterest expenses |  | 250,178 | 228,374 | 219,813 |  |
Income (loss) before income taxes |  | 100,153 | 79,435 | 52,642 |  |
LHFI, net of deferred fees and costs |  | 3,085,207 | 2,958,811 |  |  |
Goodwill |  | 364,018 | 286,031 |  |  |
Deposits |  | 11,899,197 | 9,816,562 |  |  |
Operating segments | Consumer Banking | American National |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Goodwill |  |  |  |  | $ 78,000 |
Corporate Other |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Interest income |  | (614,421) | (432,180) | (180,363) |  |
Interest expense |  | (634,251) | (518,362) | (240,034) |  |
Net interest income |  | 19,830 | 86,182 | 59,671 |  |
Provision for credit losses |  | (12) | 5 | 39 |  |
Net interest income after provision for credit losses |  | 19,842 | 86,177 | 59,632 |  |
Noninterest income |  | 14,723 | 2,739 | 25,067 |  |
Noninterest expenses |  | 62,652 | 37,714 | 25,830 |  |
Income (loss) before income taxes |  | (28,087) | 51,202 | 58,869 |  |
LHFI, net of deferred fees and costs |  | (129,226) | (12,601) |  |  |
Goodwill |  | 0 | 0 |  |  |
Deposits |  | $ 1,305,019 | 598,135 |  |  |
Gain on sale of DHFB |  |  |  | 9,100 |  |
Corporate Other | Strategic cost saving initiatives |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Noninterest expenses |  |  | 12,600 | $ 5,500 |  |
Corporate Other | Strategic cost saving initiatives | Other expenses |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Noninterest expenses |  |  | 9,800 |  |  |
Corporate Other | Strategic cost saving initiatives | Salaries and benefits |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Noninterest expenses |  |  | $ 2,800 |  |  |

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