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SECURITIES (Debt Securities, Held-to-Maturity, Credit Rating) (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Debt securities, held-to-maturity | $ 1,082,505 | $ 1,117,967
Credit Rating, Not Credit Rated |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Debt securities, held-to-maturity | 583,991 | 608,681
U.S. Government and agency obligations |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Debt securities, held-to-maturity | 308 | 312
U.S. Government and agency obligations | Credit Rating, Not Credit Rated |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Debt securities, held-to-maturity | 308 | 312
Municipal bonds |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Debt securities, held-to-maturity | 491,152 | 503,117
Municipal bonds | Credit Rating, Not Credit Rated |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Debt securities, held-to-maturity | 9,656 | 11,012
Corporate bonds |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Debt securities, held-to-maturity | 2,813 | 2,961
Corporate bonds | Credit Rating, Not Credit Rated |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Debt securities, held-to-maturity | 2,313 | 2,461
Mortgage-backed or related securities |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Debt securities, held-to-maturity | 588,232 | 611,577
Mortgage-backed or related securities | Credit Rating, Not Credit Rated |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Debt securities, held-to-maturity | 571,714 | 594,896
Standard & Poor's, AAA to A Rating |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Debt securities, held-to-maturity | 498,514 | 509,286
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 | 481,496 | 492,105
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 | $ 16,518 | $ 16,681

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