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SECURITIES (Debt Securities, Held-to-Maturity, Credit Rating) (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Debt securities, held-to-maturity | $ 1,015,942 | $ 521,355
U.S. Government and agency obligations |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Debt securities, held-to-maturity | 315 | 316
Municipal bonds |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Debt securities, held-to-maturity | 442,328 | 420,555
Corporate bonds |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Debt securities, held-to-maturity | 3,059 | 3,092
Mortgage-backed or related securities |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Debt securities, held-to-maturity | 570,240 | 97,392
Standard & Poor's, AAA to A Rating |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Debt securities, held-to-maturity | 446,411 | 406,863
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 | 429,085 | 406,363
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 | 16,826 | 0
Standard & Poor's, Not Rated |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Debt securities, held-to-maturity | 569,531 | 114,492
Standard & Poor's, Not Rated | U.S. Government and agency obligations |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Debt securities, held-to-maturity | 315 | 316
Standard & Poor's, Not Rated | Municipal bonds |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Debt securities, held-to-maturity | 13,243 | 14,192
Standard & Poor's, Not Rated | Corporate bonds |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Debt securities, held-to-maturity | 2,559 | 2,592
Standard & Poor's, Not Rated | Mortgage-backed or related securities |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Debt securities, held-to-maturity | $ 553,414 | $ 97,392

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