SEGMENT REPORTING AND REVENUE (Operating Segment Results) (Details) |
3 Months Ended | 9 Months Ended | ||||
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Jan. 01, 2023
USD ($)
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Sep. 30, 2023
USD ($)
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Sep. 30, 2022
USD ($)
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Sep. 30, 2023
USD ($)
segment
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Sep. 30, 2022
USD ($)
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Dec. 31, 2022
USD ($)
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| Disaggregation of Revenue [Line Items] | ||||||
| Number of operating segments | segment | 2 | |||||
| Reallocation of Noninterest Income | $ 3,000,000.0 | $ 9,500,000 | ||||
| Reallocation Of Noninterest Expense | 4,000,000.0 | 12,100,000 | ||||
| Net interest income | $ 151,941,000 | 150,715,000 | $ 457,469,000 | 420,413,000 | ||
| Provision for credit losses | 4,991,000 | 6,412,000 | 22,911,000 | 12,771,000 | ||
| Net interest income after provision for credit losses | 146,950,000 | 144,303,000 | 434,558,000 | 407,642,000 | ||
| Noninterest income | 27,094,000 | 25,584,000 | 60,918,000 | 94,023,000 | ||
| Noninterest expenses | 108,508,000 | 99,923,000 | 322,442,000 | 304,012,000 | ||
| Income before income taxes | 65,536,000 | 69,964,000 | 173,034,000 | 197,653,000 | ||
| LHFI, net of deferred fees and costs | 15,283,620,000 | 15,283,620,000 | $ 14,449,142,000 | |||
| Goodwill | 925,211,000 | 925,211,000 | 925,211,000 | |||
| Deposits | 16,786,505,000 | 16,786,505,000 | 15,931,677,000 | |||
| Strategic cost saving initiatives | ||||||
| Disaggregation of Revenue [Line Items] | ||||||
| Noninterest expenses | 8,700,000 | 12,600,000 | ||||
| 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 expenses | 2,800,000 | |||||
| Noninterest expense | (67,000) | |||||
| LHFI | ||||||
| Disaggregation of Revenue [Line Items] | ||||||
| Reallocation from Consumer Banking segment to Wholesale Banking segment | $ 136,600,000 | |||||
| Goodwill | ||||||
| Disaggregation of Revenue [Line Items] | ||||||
| Reallocation from Consumer Banking segment to Wholesale Banking segment | 9,600,000 | |||||
| Deposits | ||||||
| Disaggregation of Revenue [Line Items] | ||||||
| Reallocation from Consumer Banking segment to Wholesale Banking segment | $ 258,700,000 | |||||
| Wholesale Banking | ||||||
| Disaggregation of Revenue [Line Items] | ||||||
| Net interest income | 68,049,000 | 77,625,000 | 201,722,000 | 221,979,000 | ||
| Provision for credit losses | 9,310,000 | 8,470,000 | 25,853,000 | 12,844,000 | ||
| Net interest income after provision for credit losses | 58,739,000 | 69,155,000 | 175,869,000 | 209,135,000 | ||
| Noninterest income | 9,468,000 | 8,453,000 | 25,743,000 | 25,967,000 | ||
| Noninterest expenses | 40,039,000 | 40,164,000 | 123,207,000 | 118,216,000 | ||
| Income before income taxes | 28,168,000 | 37,444,000 | 78,405,000 | 116,886,000 | ||
| LHFI, net of deferred fees and costs | 12,343,799,000 | 12,343,799,000 | 11,476,258,000 | |||
| Goodwill | 639,180,000 | 639,180,000 | 639,180,000 | |||
| Deposits | 6,537,472,000 | 6,537,472,000 | 6,128,729,000 | |||
| Consumer Banking | ||||||
| Disaggregation of Revenue [Line Items] | ||||||
| Net interest income | 63,912,000 | 58,749,000 | 190,806,000 | 157,918,000 | ||
| Provision for credit losses | (4,319,000) | (2,058,000) | (2,947,000) | (100,000) | ||
| Net interest income after provision for credit losses | 68,231,000 | 60,807,000 | 193,753,000 | 158,018,000 | ||
| Noninterest income | 13,722,000 | 11,939,000 | 38,188,000 | 45,135,000 | ||
| Noninterest expenses | 54,994,000 | 54,740,000 | 168,971,000 | 165,523,000 | ||
| Income before income taxes | 26,959,000 | 18,006,000 | 62,970,000 | 37,630,000 | ||
| LHFI, net of deferred fees and costs | 2,953,367,000 | 2,953,367,000 | 2,990,017,000 | |||
| Goodwill | 286,031,000 | 286,031,000 | 286,031,000 | |||
| Deposits | 9,726,079,000 | 9,726,079,000 | 9,724,598,000 | |||
| Corporate Other | ||||||
| Disaggregation of Revenue [Line Items] | ||||||
| Net interest income | 19,980,000 | 14,341,000 | 64,941,000 | 40,516,000 | ||
| Provision for credit losses | 0 | 0 | 5,000 | 27,000 | ||
| Net interest income after provision for credit losses | 19,980,000 | 14,341,000 | 64,936,000 | 40,489,000 | ||
| Noninterest income | 3,904,000 | 5,192,000 | (3,013,000) | 22,921,000 | ||
| Noninterest expenses | 13,475,000 | 5,019,000 | 30,264,000 | 20,273,000 | ||
| Income before income taxes | 10,409,000 | $ 14,514,000 | 31,659,000 | $ 43,137,000 | ||
| LHFI, net of deferred fees and costs | (13,546,000) | (13,546,000) | (17,133,000) | |||
| Goodwill | 0 | 0 | 0 | |||
| Deposits | $ 522,954,000 | $ 522,954,000 | $ 78,350,000 | |||