LOANS AND THE ALLOWANCE FOR CREDIT LOSSES - Allowance for loan losses by portfolio (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 22,044	$ 14,357	$ 17,183	$ 13,732	$ 13,732
Impact of ASU 2016-13 adoption(1)	246,256	234,862	246,256	234,862	240,864	$ 242,242	$ 228,024	$ 219,041
Provision for loan losses	1,321	1,756
Charge-offs	(198)	(50)	(228)	(242)	(300)
Recoveries	8	18	25	106
Ending balance	23,175	16,081	23,175	16,081	17,183
Provision for loan losses			2,725	2,485
Individually	4,000		4,000
Collectively	19,175		19,175		17,183
Individually evaluated	55,617		55,617		12,137
Collectively evaluated	2,459,378		2,459,378		2,433,955
Loans held for investment measured at fair value					23,321
Total	2,530,459		2,530,459		2,469,413
Cumulative change in accounting principle | Accounting Standards Update 2016-13
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Impact of ASU 2016-13 adoption(1)					3,470
Cash, Securities, and Other
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	1,311	1,194	1,198	1,598	1,598
Provision for loan losses	(185)	(97)
Charge-offs			0
Ending balance	1,126	1,097	1,126	1,097	1,198
Provision for loan losses			(265)	(501)
Collectively	1,126		1,126		1,198
Individually evaluated	1,704		1,704		4
Collectively evaluated	146,914		146,914		165,555
Total	148,618		148,618		165,559
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(1)					193
Consumer and Other
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	137	220	191	266	266
Provision for loan losses	(15)	9
Charge-offs	(12)	(50)	(42)	(242)
Recoveries	4	18	19	106
Ending balance	114	197	114	197	191
Provision for loan losses			(160)	67
Collectively	114		114		191
Individually evaluated	7,500		7,500		5
Collectively evaluated	15,964		15,964		26,065
Loans held for investment measured at fair value					23,321
Total	38,928		38,928		49,391
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(1)					106
Construction and Development
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	7,496	1,074	2,025	1,092	1,092
Provision for loan losses	405	496
Charge-offs			0
Ending balance	7,901	1,570	7,901	1,570	2,025
Provision for loan losses			1,195	478
Collectively	7,901		7,901		2,025
Individually evaluated					201
Collectively evaluated	347,053		347,053		285,426
Total	347,053		347,053		285,627
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(1)					4,681
1-4 Family Residential
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	3,579	4,845	6,309	3,553	3,553
Provision for loan losses	38	824
Charge-offs			0
Recoveries	3		3
Ending balance	3,620	5,669	3,620	5,669	6,309
Provision for loan losses			116	2,116
Collectively	3,620		3,620		6,309
Individually evaluated	3,063		3,063
Collectively evaluated	911,948		911,948		899,722
Total	915,011		915,011		899,722
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(1)					(2,808)
Non-Owner Occupied CRE
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	2,495	3,235	3,490	2,952	2,952
Provision for loan losses	(240)	402
Charge-offs			0
Ending balance	2,255	3,637	2,255	3,637	3,490
Provision for loan losses			(546)	685
Collectively	2,255		2,255		3,490
Collectively evaluated	523,910		523,910		493,134
Total	523,910		523,910		493,134
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(1)					(689)
Owner Occupied CRE
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	1,182	1,477	1,510	1,292	1,292
Provision for loan losses	(172)	31
Charge-offs			0
Ending balance	1,010	1,508	1,010	1,508	1,510
Provision for loan losses			(396)	216
Collectively	1,010		1,010		1,510
Individually evaluated	3,980		3,980		1,165
Collectively evaluated	202,978		202,978		213,024
Total	206,958		206,958		214,189
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(1)					(104)
Commercial and Industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	5,844	2,312	2,460	2,979	2,979
Provision for loan losses	1,490	91
Charge-offs			(186)
Ending balance	7,149	$ 2,403	7,149	2,403	2,460
Provision for loan losses			2,781	$ (576)
Individually	4,000		4,000
Collectively	3,149		3,149		2,460
Individually evaluated	39,370		39,370		10,762
Collectively evaluated	310,611		310,611		351,029
Total	349,981		349,981		361,791
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(1)					$ 2,091
Commercial and Industrial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Charge-offs	(186)		(186)
Recoveries	1		3
Loan Held for Investment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Loans held for investment measured at fair value	$ 15,464		$ 15,464