INVESTMENTS (Summary of Amortized Cost and Fair Value of Held to Maturity Securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Schedule of Investments [Line Items]
Held-to-maturity securities, at amortized cost	$ 540,074	$ 546,583
Unrealized Gains	2,290	763
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(31,365)	(41,153)
Held-to-maturity securities, fair value	510,999	506,193
Obligations of U.S. government-sponsored enterprises
Schedule of Investments [Line Items]
Held-to-maturity securities, at amortized cost	7,491	7,457
Unrealized Gains	0	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(507)	(777)
Held-to-maturity securities, fair value	6,984	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	56,049	55,978
Unrealized Gains	1,683	431
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(760)	(1,610)
Held-to-maturity securities, fair value	56,972	54,799
Debt Securities, Held-to-Maturity, Amortized Cost, Unamortized Unrealized Loss	6,000	6,100
MBS issued or guaranteed by U.S. government-sponsored enterprises
Schedule of Investments [Line Items]
Held-to-maturity securities, at amortized cost	314,589	317,406
Unrealized Gains	0	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(18,932)	(24,766)
Held-to-maturity securities, fair value	295,657	292,640
Debt Securities, Held-to-Maturity, Amortized Cost, Unamortized Unrealized Loss	37,400	38,400
CMO issued or guaranteed by U.S. government-sponsored enterprises
Schedule of Investments [Line Items]
Held-to-maturity securities, at amortized cost	143,030	145,069
Unrealized Gains	0	0
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(10,628)	(13,724)
Held-to-maturity securities, fair value	132,402	131,345
Debt Securities, Held-to-Maturity, Amortized Cost, Unamortized Unrealized Loss	20,100	20,700
Subordinated corporate bonds
Schedule of Investments [Line Items]
Held-to-maturity securities, at amortized cost	18,915	20,673
Unrealized Gains	607	332
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(538)	(276)
Held-to-maturity securities, fair value	18,984	20,729
Debt Securities, Held-to-Maturity, Amortized Cost, Unamortized Unrealized Loss	$ 108	$ 117