v3.26.1
SECURITIES (Debt Securities, Held-to-Maturity, Credit Rating) (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Financing Receivable, Credit Quality Indicator [Line Items]    
Debt securities, held-to-maturity $ 943,973 $ 961,487
Credit Rating, Not Credit Rated    
Financing Receivable, Credit Quality Indicator [Line Items]    
Debt securities, held-to-maturity 506,080 522,743
U.S. Government and agency obligations    
Financing Receivable, Credit Quality Indicator [Line Items]    
Debt securities, held-to-maturity 221 262
U.S. Government and agency obligations | Credit Rating, Not Credit Rated    
Financing Receivable, Credit Quality Indicator [Line Items]    
Debt securities, held-to-maturity 221 262
Municipal bonds    
Financing Receivable, Credit Quality Indicator [Line Items]    
Debt securities, held-to-maturity 429,069 430,571
Municipal bonds | Credit Rating, Not Credit Rated    
Financing Receivable, Credit Quality Indicator [Line Items]    
Debt securities, held-to-maturity 7,580 8,296
Corporate bonds    
Financing Receivable, Credit Quality Indicator [Line Items]    
Debt securities, held-to-maturity 2,516 2,544
Corporate bonds | Credit Rating, Not Credit Rated    
Financing Receivable, Credit Quality Indicator [Line Items]    
Debt securities, held-to-maturity 2,016 2,044
Mortgage-backed or related securities    
Financing Receivable, Credit Quality Indicator [Line Items]    
Debt securities, held-to-maturity 512,167 528,110
Mortgage-backed or related securities | Credit Rating, Not Credit Rated    
Financing Receivable, Credit Quality Indicator [Line Items]    
Debt securities, held-to-maturity 496,263 512,141
Standard & Poor's, AAA to A Rating    
Financing Receivable, Credit Quality Indicator [Line Items]    
Debt securities, held-to-maturity 437,893 438,744
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 421,489 422,275
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 $ 15,904 $ 15,969