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SECURITIES (Debt Securities, Held-to-Maturity, Credit Rating) (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Debt securities, held-to-maturity | $ 1,038,634 | $ 1,059,387
Credit Rating, Not Credit Rated |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Debt securities, held-to-maturity | 579,563 | 585,429
U.S. Government and agency obligations |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Debt securities, held-to-maturity | 306 | 307
U.S. Government and agency obligations | Credit Rating, Not Credit Rated |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Debt securities, held-to-maturity | 306 | 307
Municipal bonds |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Debt securities, held-to-maturity | 451,091 | 466,032
Municipal bonds | Credit Rating, Not Credit Rated |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Debt securities, held-to-maturity | 8,919 | 9,033
Corporate bonds |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Debt securities, held-to-maturity | 2,749 | 2,781
Corporate bonds | Credit Rating, Not Credit Rated |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Debt securities, held-to-maturity | 2,249 | 2,281
Mortgage-backed or related securities |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Debt securities, held-to-maturity | 584,488 | 590,267
Mortgage-backed or related securities | Credit Rating, Not Credit Rated |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Debt securities, held-to-maturity | 568,089 | 573,808
Standard & Poor's, AAA to A Rating |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Debt securities, held-to-maturity | 459,071 | 473,958
Standard & Poor's, AAA to A Rating | U.S. Government and agency obligations |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Debt securities, held-to-maturity | 0 | 0
Standard & Poor's, AAA to A Rating | Municipal bonds |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Debt securities, held-to-maturity | 442,172 | 456,999
Standard & Poor's, AAA to A Rating | Corporate bonds |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Debt securities, held-to-maturity | 500 | 500
Standard & Poor's, AAA to A Rating | Mortgage-backed or related securities |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Debt securities, held-to-maturity | $ 16,399 | $ 16,459

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