SECURITIES (Debt Securities, Held-to-Maturity, Credit Rating) (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items]
Debt securities, held-to-maturity	$ 1,152,189	$ 521,355
Credit Rating, Not Credit Rated
Financing Receivable, Credit Quality Indicator [Line Items]
Debt securities, held-to-maturity	645,100	114,492
U.S. Government and agency obligations
Financing Receivable, Credit Quality Indicator [Line Items]
Debt securities, held-to-maturity	313	316
U.S. Government and agency obligations | Credit Rating, Not Credit Rated
Financing Receivable, Credit Quality Indicator [Line Items]
Debt securities, held-to-maturity	313	316
Municipal bonds
Financing Receivable, Credit Quality Indicator [Line Items]
Debt securities, held-to-maturity	502,416	420,555
Municipal bonds | Credit Rating, Not Credit Rated
Financing Receivable, Credit Quality Indicator [Line Items]
Debt securities, held-to-maturity	12,606	14,192
Corporate bonds
Financing Receivable, Credit Quality Indicator [Line Items]
Debt securities, held-to-maturity	3,027	3,092
Corporate bonds | Credit Rating, Not Credit Rated
Financing Receivable, Credit Quality Indicator [Line Items]
Debt securities, held-to-maturity	2,527	2,592
Mortgage-backed or related securities
Financing Receivable, Credit Quality Indicator [Line Items]
Debt securities, held-to-maturity	646,433	97,392
Mortgage-backed or related securities | Credit Rating, Not Credit Rated
Financing Receivable, Credit Quality Indicator [Line Items]
Debt securities, held-to-maturity	629,654	97,392
Standard & Poor's, AAA to A Rating
Financing Receivable, Credit Quality Indicator [Line Items]
Debt securities, held-to-maturity	507,089	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	489,810	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	$ 16,779	$ 0