LOANS AND THE ALLOWANCE FOR CREDIT LOSSES - Allowance for loan losses by portfolio (Details) - USD ($) $ in Thousands		3 Months Ended		12 Months Ended
		Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		$ 23,931	$ 17,183	$ 17,183
Impact of ASU 2016-13 adoption		245,528	239,822	242,738	$ 240,864
Provision (release) for credit losses		699	(805)
Financing Receivable, Allowance for Credit Loss, Writeoff		(11)	(17)	(8,800)
Recoveries		11	12
Ending balance		24,630	19,843	23,931
Cumulative change in accounting principle
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Impact of ASU 2016-13 adoption	[1]				(5,319)
Cumulative change in accounting principle | Accounting Standards Update 2016-13
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Impact of ASU 2016-13 adoption					3,470
Cash, Securities, and Other
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		961	1,198	1,198
Provision (release) for credit losses		(184)	60
Financing Receivable, Allowance for Credit Loss, Writeoff		0		0
Ending balance		777	1,451	961
Cash, Securities, and Other | Cumulative change in accounting principle | Accounting Standards Update 2016-13
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Impact of ASU 2016-13 adoption					193
Consumer and Other
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		124	191	191
Provision (release) for credit losses		(31)	(95)
Financing Receivable, Allowance for Credit Loss, Writeoff		(11)	(17)	(101)
Recoveries		5	11
Ending balance		87	196	124
Consumer and Other | Cumulative change in accounting principle | Accounting Standards Update 2016-13
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Impact of ASU 2016-13 adoption					106
Construction and Development
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		7,945	2,025	2,025
Provision (release) for credit losses		(557)	(477)
Financing Receivable, Allowance for Credit Loss, Writeoff		0		0
Ending balance		7,388	6,229	7,945
Construction and Development | Cumulative change in accounting principle | Accounting Standards Update 2016-13
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Impact of ASU 2016-13 adoption					4,681
1-4 Family Residential
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		4,370	6,309	6,309
Provision (release) for credit losses		(87)	320
Financing Receivable, Allowance for Credit Loss, Writeoff		0		0
Recoveries		5	0
Ending balance		4,288	3,821	4,370
1-4 Family Residential | Cumulative change in accounting principle | Accounting Standards Update 2016-13
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Impact of ASU 2016-13 adoption					(2,808)
Non-Owner Occupied CRE
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		2,325	3,490	3,490
Provision (release) for credit losses		(129)	(92)
Financing Receivable, Allowance for Credit Loss, Writeoff		0		0
Ending balance		2,196	2,709	2,325
Non-Owner Occupied CRE | Cumulative change in accounting principle | Accounting Standards Update 2016-13
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Impact of ASU 2016-13 adoption					(689)
Owner Occupied CRE
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		1,034	1,510	1,510
Provision (release) for credit losses		(59)	(134)
Financing Receivable, Allowance for Credit Loss, Writeoff		0		0
Ending balance		975	1,272	1,034
Owner Occupied CRE | Cumulative change in accounting principle | Accounting Standards Update 2016-13
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Impact of ASU 2016-13 adoption					(104)
Commercial and Industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance		7,172	2,460	2,460
Provision (release) for credit losses		1,746	(387)
Financing Receivable, Allowance for Credit Loss, Writeoff		0	0	(8,737)
Recoveries		1	1
Ending balance		$ 8,919	$ 4,165	$ 7,172
Commercial and Industrial | Cumulative change in accounting principle | Accounting Standards Update 2016-13
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Impact of ASU 2016-13 adoption					$ 2,091

[1] Refer to Note 1 – Organization and Summary of Significant Accounting Policies for further information.