| MORTGAGE BANKING ACTIVITIES (Summary of mortgage servicing rights) (Details) $ in Thousands | 3 Months Ended | 12 Months Ended | 
|---|---|---|
| Mar. 31, 2024  USD ($)  Contracts | Dec. 31, 2023  USD ($)  Contracts | |
| Servicing Assets at Fair Value [Line Items] | ||
| Outstanding principal balance of residential mortgage loans serviced for others | $ 2,731,172 | $ 2,733,918 | 
| Residential Mortgage [Member] | ||
| Servicing Assets at Fair Value [Line Items] | ||
| Number of residential mortgage loans serviced for others | Contracts | 463 | 450 | 
| Outstanding principal balance of residential mortgage loans serviced for others | $ 120,713 | $ 108,897 | 
| Weighted average interest rate | 5.48% | 5.37% | 
| Remaining contractual term (in months) | 349 months | 309 months | 
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- Definition The total number of residential mortgages serviced. No definition available. 
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- Definition Remaining contratual term related to mortgage serviced for others, PnMn. No definition available. 
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- Definition Weighted average interest rate Mortgages Serviced. No definition available. 
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- Definition Amortized cost, before allowance for credit loss, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease. Reference 1: http://www.xbrl.org/2003/role/exampleRef 
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/disclosureRef 
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- Details 
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