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SECURITIES (Debt Securities, Held-to-Maturity, Credit Rating) (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Financing Receivable, Credit Quality Indicator [Line Items]    
Debt securities, held-to-maturity $ 981,614 $ 1,001,861
Credit Rating, Not Credit Rated    
Financing Receivable, Credit Quality Indicator [Line Items]    
Debt securities, held-to-maturity 539,001 554,985
U.S. Government and agency obligations    
Financing Receivable, Credit Quality Indicator [Line Items]    
Debt securities, held-to-maturity 300 302
U.S. Government and agency obligations | Credit Rating, Not Credit Rated    
Financing Receivable, Credit Quality Indicator [Line Items]    
Debt securities, held-to-maturity 300 302
Municipal bonds    
Financing Receivable, Credit Quality Indicator [Line Items]    
Debt securities, held-to-maturity 435,022 438,196
Municipal bonds | Credit Rating, Not Credit Rated    
Financing Receivable, Credit Quality Indicator [Line Items]    
Debt securities, held-to-maturity 9,004 8,038
Corporate bonds    
Financing Receivable, Credit Quality Indicator [Line Items]    
Debt securities, held-to-maturity 2,602 2,658
Corporate bonds | Credit Rating, Not Credit Rated    
Financing Receivable, Credit Quality Indicator [Line Items]    
Debt securities, held-to-maturity 2,102 2,158
Mortgage-backed or related securities    
Financing Receivable, Credit Quality Indicator [Line Items]    
Debt securities, held-to-maturity 543,690 560,705
Mortgage-backed or related securities | Credit Rating, Not Credit Rated    
Financing Receivable, Credit Quality Indicator [Line Items]    
Debt securities, held-to-maturity 527,595 544,487
Standard & Poor's, AAA to A Rating    
Financing Receivable, Credit Quality Indicator [Line Items]    
Debt securities, held-to-maturity 442,613 446,876
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 426,018 430,158
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 $ 16,095 $ 16,218