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SECURITIES (Debt Securities, Held-to-Maturity, Credit Rating) (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Debt securities, held-to-maturity | $ 971,901 | $ 1,001,861
Credit Rating, Not Credit Rated |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Debt securities, held-to-maturity | 530,634 | 554,985
U.S. Government and agency obligations |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Debt securities, held-to-maturity | 279 | 302
U.S. Government and agency obligations | Credit Rating, Not Credit Rated |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Debt securities, held-to-maturity | 279 | 302
Municipal bonds |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Debt securities, held-to-maturity | 433,560 | 438,196
Municipal bonds | Credit Rating, Not Credit Rated |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Debt securities, held-to-maturity | 8,825 | 8,038
Corporate bonds |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Debt securities, held-to-maturity | 2,573 | 2,658
Corporate bonds | Credit Rating, Not Credit Rated |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Debt securities, held-to-maturity | 2,073 | 2,158
Mortgage-backed or related securities |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Debt securities, held-to-maturity | 535,489 | 560,705
Mortgage-backed or related securities | Credit Rating, Not Credit Rated |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Debt securities, held-to-maturity | 519,457 | 544,487
Standard & Poor's, AAA to A Rating |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Debt securities, held-to-maturity | 441,267 | 446,876
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 | 424,735 | 430,158
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 | $ 16,032 | $ 16,218

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