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INVESTMENT SECURITIES (Available for Sale and Held to Maturity Investment Securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	$ 775,608	$ 754,950
Gross Unrealized Gains	291	507
Gross Unrealized Losses	(115,066)	(108,247)
Fair Value	660,833	647,210
ACL	0	0
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	624,948	632,338
Gross Unrecognized Gains	0	61
Gross Unrecognized Losses	(83,263)	(67,221)
Fair Value	541,685	565,178	$ 673,200
ACL	0	0
States and political subdivisions
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	152,393	156,432
Gross Unrealized Gains	8	13
Gross Unrealized Losses	(29,378)	(29,810)
Fair Value	123,023	126,635
ACL	0	0
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	41,984	41,959
Gross Unrecognized Gains	0	0
Gross Unrecognized Losses	(7,324)	(6,706)
Fair Value	34,660	35,253
ACL	0	0
Corporate securities
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	35,611	35,731
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(4,213)	(4,317)
Fair Value	31,398	31,414
ACL	0	0
U.S. Treasury and other government-sponsored entities and agencies
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	41,849	28,105
Gross Unrealized Gains	147	33
Gross Unrealized Losses	(2,090)	(1,941)
Fair Value	39,906	26,197
ACL	0	0
Residential - U.S. government-sponsored entities and agencies
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	412,443	441,898
Gross Unrealized Gains	7	95
Gross Unrealized Losses	(62,813)	(63,607)
Fair Value	349,637	378,386
ACL	0	0
Schedule of Held-to-Maturity Securities [Line Items]
Amortized Cost	582,964	590,379
Gross Unrecognized Gains	0	61
Gross Unrecognized Losses	(75,939)	(60,515)
Fair Value	507,025	529,925
ACL	0	0
Residential - Non-government agencies
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	18,893	19,322
Gross Unrealized Gains	129	366
Gross Unrealized Losses	(1,081)	(980)
Fair Value	17,941	18,708
ACL	0	0
Commercial - U.S. government-sponsored entities and agencies
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	99,213	58,318
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(15,334)	(7,404)
Fair Value	83,879	50,914
ACL	0	0
Commercial - Non-government agencies
Debt Securities, Available-for-Sale [Line Items]
Amortized Cost	15,206	15,144
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(157)	(188)
Fair Value	15,049	14,956
ACL	$ 0	$ 0

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