INVESTMENT SECURITIES - Amortized Cost and Estimated Fair Value of Securities Held-to-Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	$ 141,859	$ 134,864
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(26,170)	(20,326)
Estimated Fair Value	115,689	114,538
State, county and municipal securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	31,905	31,905
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(7,350)	(5,380)
Estimated Fair Value	24,555	26,525
Mortgage-backed securities
Schedule of Held-to-maturity Securities [Line Items]
Amortized Cost	109,954	102,959
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(18,820)	(14,946)
Estimated Fair Value	$ 91,134	$ 88,013