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SEGMENT REPORTING AND REVENUE (Operating Segment Results) (Details) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) segment | Sep. 30, 2023 USD ($) | Apr. 01, 2024 USD ($) | Dec. 31, 2023 USD ($)
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Number of operating segments | segment |  |  | 2 |  |  |
Net interest income | $ 182,932,000 | $ 151,941,000 | $ 515,290,000 | $ 457,469,000 |  |
Provision for credit losses | 2,603,000 | 4,991,000 | 32,592,000 | 22,911,000 |  |
Net interest income after provision for credit losses | 180,329,000 | 146,950,000 | 482,698,000 | 434,558,000 |  |
Noninterest income | 34,286,000 | 27,094,000 | 83,651,000 | 60,918,000 |  |
Noninterest expenses | 122,582,000 | 108,508,000 | 377,859,000 | 322,442,000 |  |
Income before income taxes | 92,033,000 | 65,536,000 | 188,490,000 | 173,034,000 |  |
LHFI, net of deferred fees and costs | 18,337,299,000 |  | 18,337,299,000 |  |  | $ 15,635,043,000
Goodwill | 1,212,710,000 |  | 1,212,710,000 |  |  | 925,211,000
Deposits | 20,305,287,000 |  | 20,305,287,000 |  |  | 16,818,129,000
Strategic cost saving initiatives | Other expenses |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Noninterest expenses |  | 8,700,000 |  | 9,800,000 |  |
Strategic cost saving initiatives | Salaries and benefits |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Noninterest expense offset |  | (67,000) |  |  |  |
Noninterest expenses |  |  |  | 2,800,000 |  |
Strategic cost saving initiatives | Noninterest expense |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Noninterest expenses |  | 8,700,000 |  | 12,600,000 |  |
American National |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Goodwill | 287,499,000 |  | 287,499,000 |  | $ 287,499,000 | 0
Wholesale Banking |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net interest income | 101,097,000 | 68,049,000 | 276,919,000 | 201,722,000 |  |
Provision for credit losses | 217,000 | 9,310,000 | 25,803,000 | 25,853,000 |  |
Net interest income after provision for credit losses | 100,880,000 | 58,739,000 | 251,116,000 | 175,869,000 |  |
Noninterest income | 10,773,000 | 9,468,000 | 29,913,000 | 25,743,000 |  |
Noninterest expenses | 50,880,000 | 40,039,000 | 144,152,000 | 123,207,000 |  |
Income before income taxes | 60,773,000 | 28,168,000 | 136,877,000 | 78,405,000 |  |
LHFI, net of deferred fees and costs | 15,366,703,000 |  | 15,366,703,000 |  |  | 12,688,833,000
Goodwill | 845,239,000 |  | 845,239,000 |  |  | 639,180,000
Deposits | 7,083,741,000 |  | 7,083,741,000 |  |  | 6,403,432,000
Wholesale Banking | American National |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Goodwill | 209,900,000 |  | 209,900,000 |  | 209,900,000 |
Consumer Banking |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net interest income | 79,112,000 | 63,912,000 | 224,358,000 | 190,806,000 |  |
Provision for credit losses | 2,389,000 | (4,319,000) | 6,801,000 | (2,947,000) |  |
Net interest income after provision for credit losses | 76,723,000 | 68,231,000 | 217,557,000 | 193,753,000 |  |
Noninterest income | 15,721,000 | 13,722,000 | 43,589,000 | 38,188,000 |  |
Noninterest expenses | 64,335,000 | 54,994,000 | 184,446,000 | 168,971,000 |  |
Income before income taxes | 28,109,000 | 26,959,000 | 76,700,000 | 62,970,000 |  |
LHFI, net of deferred fees and costs | 3,113,472,000 |  | 3,113,472,000 |  |  | 2,958,811,000
Goodwill | 362,245,000 |  | 362,245,000 |  |  | 286,031,000
Deposits | 11,649,873,000 |  | 11,649,873,000 |  |  | 9,816,562,000
Consumer Banking | American National |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Goodwill | 77,600,000 |  | 77,600,000 |  | $ 77,600,000 |
Corporate Other |  |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |  |
Net interest income | 2,723,000 | 19,980,000 | 14,013,000 | 64,941,000 |  |
Provision for credit losses | (3,000) | 0 | (12,000) | 5,000 |  |
Net interest income after provision for credit losses | 2,726,000 | 19,980,000 | 14,025,000 | 64,936,000 |  |
Noninterest income | 7,792,000 | 3,904,000 | 10,149,000 | (3,013,000) |  |
Noninterest expenses | 7,367,000 | 13,475,000 | 49,261,000 | 30,264,000 |  |
Income before income taxes | 3,151,000 | $ 10,409,000 | (25,087,000) | $ 31,659,000 |  |
LHFI, net of deferred fees and costs | (142,876,000) |  | (142,876,000) |  |  | (12,601,000)
Goodwill | 5,226,000 |  | 5,226,000 |  |  | 0
Deposits | $ 1,571,673,000 |  | $ 1,571,673,000 |  |  | $ 598,135,000

X
- Definition Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements. + References No definition available. + Details
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