INVESTMENTS (Summary of Amortized Cost and Fair Value of Held to Maturity Securities) (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Schedule of Investments [Line Items]
Held-to-maturity securities, at amortized cost	$ 534,584	$ 546,583
Unrealized Gains	1,702	763
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(40,696)	(41,153)
Held-to-maturity securities, fair value	495,590	506,193
Obligations of U.S. government-sponsored enterprises
Schedule of Investments [Line Items]
Held-to-maturity securities, at amortized cost	7,525	7,457
Unrealized Gains	0	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(639)	(777)
Held-to-maturity securities, fair value	6,886	6,680
Debt Securities, Held-to-Maturity, Amortized Cost, Unamortized Unrealized Loss	1,100	1,100
Obligations of states and political subdivisions
Schedule of Investments [Line Items]
Held-to-maturity securities, at amortized cost	56,120	55,978
Unrealized Gains	1,174	431
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(963)	(1,610)
Held-to-maturity securities, fair value	56,331	54,799
Debt Securities, Held-to-Maturity, Amortized Cost, Unamortized Unrealized Loss	5,900	6,100
MBS issued or guaranteed by U.S. government-sponsored enterprises
Schedule of Investments [Line Items]
Held-to-maturity securities, at amortized cost	311,208	317,406
Unrealized Gains	0	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(24,389)	(24,766)
Held-to-maturity securities, fair value	286,819	292,640
Debt Securities, Held-to-Maturity, Amortized Cost, Unamortized Unrealized Loss	36,500	38,400
CMO issued or guaranteed by U.S. government-sponsored enterprises
Schedule of Investments [Line Items]
Held-to-maturity securities, at amortized cost	140,751	145,069
Unrealized Gains	0	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(13,454)	(13,724)
Held-to-maturity securities, fair value	127,297	131,345
Debt Securities, Held-to-Maturity, Amortized Cost, Unamortized Unrealized Loss	19,500	20,700
Corporate bonds
Schedule of Investments [Line Items]
Held-to-maturity securities, at amortized cost	18,980	20,673
Unrealized Gains	528	332
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(1,251)	(276)
Held-to-maturity securities, fair value	18,257	20,729
Debt Securities, Held-to-Maturity, Amortized Cost, Unamortized Unrealized Loss	$ 101	$ 117