LOANS, ALLOWANCE FOR CREDIT LOSSES - LOANS, AND CREDIT QUALITY - Summary of Loans by Loan Risk Categories (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	$ 810,769	$ 1,528,490
2022/2021	1,478,242	1,271,582
2021/2020	1,128,121	689,302
2020/2019	585,085	437,225
2019/2018	367,691	322,275
Prior	1,083,584	1,061,537
Revolving	894,106	864,323
Revolving to Term	6,344	5,765
Loans	6,353,942	6,180,499
Residential first mortgage
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
2023/2022	0	0
2022/2021	0	0
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
Prior	(5)	(65)
Revolving	0	0
Revolving to Term	0	0
Total loans	(5)	(65)
Residential junior mortgage
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
2023/2022	0	0
2022/2021	0	0
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
Prior	(96)	0
Revolving	0	0
Revolving to Term	0	0
Total loans	(96)	0
Retail & other
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
2023/2022		0
2022/2021		(1)
2021/2020		(6)
2020/2019		(1)
2019/2018		0
Prior		0
Revolving		(215)
Revolving to Term		0
Total loans		(223)
Commercial & industrial
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
2023/2022	0	(38)
2022/2021	(89)	(41)
2021/2020	(114)	(2)
2020/2019	0	0
2019/2018	0	(109)
Prior	(222)	0
Revolving	(15)	0
Revolving to Term	0	0
Total loans	(440)	(190)
Owner-occupied commercial real estate (“CRE”)
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
2023/2022	0	0
2022/2021	0	0
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
Prior	(773)	(555)
Revolving	0	0
Revolving to Term	0	0
Total loans	(773)	(555)
Agricultural
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
2023/2022	0	0
2022/2021	0	0
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
Prior	(66)	0
Revolving	0	0
Revolving to Term	0	0
Total loans	(66)	0
CRE investment
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
2023/2022	0	0
2022/2021	0	0
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
Prior	0	0
Revolving	0	0
Revolving to Term	0	0
Total loans	0	0
Construction & land development
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
2023/2022	0	0
2022/2021	0	0
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
Prior	0	0
Revolving	0	0
Revolving to Term	0	0
Total loans	0	0
Residential construction
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
2023/2022	0	0
2022/2021	0	0
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
Prior	0	0
Revolving	0	0
Revolving to Term	0	0
Total loans	0	0
Retail & other
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	8,238	12,318
2022/2021	8,107	9,003
2021/2020	5,408	4,243
2020/2019	2,442	3,190
2019/2018	1,708	1,065
Prior	3,934	24,955
Revolving	25,891	492
Revolving to Term	0	0
Loans	55,728	55,266
Financing Receivable, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]
2023/2022	(7)
2022/2021	(1)
2021/2020	0
2020/2019	(1)
2019/2018	0
Prior	(52)
Revolving	(212)
Revolving to Term	0
Total loans	(273)
Retail & other | Grades 1-4
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	8,207	12,318
2022/2021	8,107	8,957
2021/2020	5,345	4,221
2020/2019	2,434	3,188
2019/2018	1,689	1,035
Prior	3,869	24,950
Revolving	25,891	492
Revolving to Term	0	0
Loans	55,542	55,161
Retail & other | Grade 5
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	0	0
2022/2021	0	23
2021/2020	38	0
2020/2019	0	0
2019/2018	0	0
Prior	0	0
Revolving	0	0
Revolving to Term	0	0
Loans	38	23
Retail & other | Grade 7
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	31	0
2022/2021	0	23
2021/2020	25	22
2020/2019	8	2
2019/2018	19	30
Prior	65	5
Revolving	0	0
Revolving to Term	0	0
Loans	148	82
Commercial
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Loans	3,402,134	3,348,025
Commercial | Commercial & industrial
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	232,509	329,347
2022/2021	252,113	234,543
2021/2020	182,228	116,025
2020/2019	72,010	73,915
2019/2018	55,900	55,352
Prior	98,545	94,874
Revolving	390,704	400,763
Revolving to Term	0	0
Loans	1,284,009	1,304,819
Commercial | Commercial & industrial | Grades 1-4
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	223,515	317,394
2022/2021	234,193	226,065
2021/2020	171,555	101,374
2020/2019	66,026	68,884
2019/2018	49,054	50,189
Prior	81,272	77,589
Revolving	359,284	360,978
Revolving to Term	0	0
Loans	1,184,899	1,202,473
Commercial | Commercial & industrial | Grade 5
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	3,252	9,938
2022/2021	13,656	5,902
2021/2020	7,516	10,811
2020/2019	3,388	1,530
2019/2018	5,074	3,986
Prior	7,020	4,562
Revolving	18,753	20,617
Revolving to Term	0	0
Loans	58,659	57,346
Commercial | Commercial & industrial | Grade 6
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	0	1,459
2022/2021	562	2,283
2021/2020	502	629
2020/2019	187	511
2019/2018	3	402
Prior	1,009	11,653
Revolving	10,974	14,047
Revolving to Term	0	0
Loans	13,237	30,984
Commercial | Commercial & industrial | Grade 7
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	5,742	556
2022/2021	3,702	293
2021/2020	2,655	3,211
2020/2019	2,409	2,990
2019/2018	1,769	775
Prior	9,244	1,070
Revolving	1,693	5,121
Revolving to Term	0	0
Loans	27,214	14,016
Commercial | Owner-occupied commercial real estate (“CRE”)
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	120,120	156,859
2022/2021	162,051	194,211
2021/2020	193,962	116,550
2020/2019	103,118	105,746
2019/2018	91,293	96,270
Prior	281,667	277,881
Revolving	4,383	7,082
Revolving to Term	0	0
Loans	956,594	954,599
Commercial | Owner-occupied commercial real estate (“CRE”) | Grades 1-4
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	114,704	151,391
2022/2021	156,723	190,313
2021/2020	181,128	105,156
2020/2019	91,038	100,606
2019/2018	85,430	91,479
Prior	247,730	252,574
Revolving	4,181	6,734
Revolving to Term	0	0
Loans	880,934	898,253
Commercial | Owner-occupied commercial real estate (“CRE”) | Grade 5
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	5,416	5,241
2022/2021	4,024	3,192
2021/2020	7,858	4,287
2020/2019	5,092	2,163
2019/2018	3,994	4,791
Prior	27,585	14,632
Revolving	52	348
Revolving to Term	0	0
Loans	54,021	34,654
Commercial | Owner-occupied commercial real estate (“CRE”) | Grade 6
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	0	0
2022/2021	0	0
2021/2020	3,905	763
2020/2019	0	2,361
2019/2018	1,531	0
Prior	12	877
Revolving	0	0
Revolving to Term	0	0
Loans	5,448	4,001
Commercial | Owner-occupied commercial real estate (“CRE”) | Grade 7
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	0	227
2022/2021	1,304	706
2021/2020	1,071	6,344
2020/2019	6,988	616
2019/2018	338	0
Prior	6,340	9,798
Revolving	150	0
Revolving to Term	0	0
Loans	16,191	17,691
Commercial | Agricultural
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	129,064	295,783
2022/2021	293,287	167,539
2021/2020	146,801	88,855
2020/2019	80,075	29,465
2019/2018	25,109	24,815
Prior	187,224	199,982
Revolving	299,971	282,168
Revolving to Term	0	0
Loans	1,161,531	1,088,607
Commercial | Agricultural | Grades 1-4
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	120,200	275,208
2022/2021	274,491	145,272
2021/2020	134,706	85,413
2020/2019	78,944	25,463
2019/2018	22,985	19,687
Prior	139,212	130,849
Revolving	277,170	249,033
Revolving to Term	0	0
Loans	1,047,708	930,925
Commercial | Agricultural | Grade 5
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	6,345	13,295
2022/2021	11,975	18,178
2021/2020	5,718	2,694
2020/2019	703	1,992
2019/2018	394	517
Prior	33,658	43,927
Revolving	15,522	21,199
Revolving to Term	0	0
Loans	74,315	101,802
Commercial | Agricultural | Grade 6
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	0	115
2022/2021	130	1,457
2021/2020	1,017	28
2020/2019	0	33
2019/2018	51	0
Prior	2,256	5,258
Revolving	194	429
Revolving to Term	0	0
Loans	3,648	7,320
Commercial | Agricultural | Grade 7
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	2,519	7,165
2022/2021	6,691	2,632
2021/2020	5,360	720
2020/2019	428	1,977
2019/2018	1,679	4,611
Prior	12,098	19,948
Revolving	7,085	11,507
Revolving to Term	0	0
Loans	35,860	48,560
Commercial real estate
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Loans	1,452,361	1,468,549
Commercial real estate | CRE investment
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	33,510	206,497
2022/2021	202,239	230,901
2021/2020	274,685	196,226
2020/2019	178,935	140,036
2019/2018	125,776	85,376
Prior	315,846	279,115
Revolving	11,260	11,798
Revolving to Term	0	0
Loans	1,142,251	1,149,949
Commercial real estate | CRE investment | Grades 1-4
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	30,720	205,930
2022/2021	194,442	229,252
2021/2020	256,765	192,527
2020/2019	169,078	134,301
2019/2018	113,510	79,649
Prior	283,339	248,595
Revolving	11,146	11,383
Revolving to Term	0	0
Loans	1,059,000	1,101,637
Commercial real estate | CRE investment | Grade 5
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	2,790	567
2022/2021	7,746	1,649
2021/2020	17,899	3,578
2020/2019	9,857	4,266
2019/2018	11,232	3,086
Prior	23,108	24,897
Revolving	49	0
Revolving to Term	0	0
Loans	72,681	38,043
Commercial real estate | CRE investment | Grade 6
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	0	0
2022/2021	0	0
2021/2020	0	0
2020/2019	0	1,170
2019/2018	0	2,396
Prior	1,340	2,483
Revolving	65	206
Revolving to Term	0	0
Loans	1,405	6,255
Commercial real estate | CRE investment | Grade 7
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	0	0
2022/2021	51	0
2021/2020	21	121
2020/2019	0	299
2019/2018	1,034	245
Prior	8,059	3,140
Revolving	0	209
Revolving to Term	0	0
Loans	9,165	4,014
Commercial real estate | Construction & land development
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	51,299	104,874
2022/2021	149,178	140,727
2021/2020	67,805	12,188
2020/2019	10,705	9,761
2019/2018	5,443	23,811
Prior	22,722	14,004
Revolving	2,958	13,235
Revolving to Term	0	0
Loans	310,110	318,600
Commercial real estate | Construction & land development | Grades 1-4
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	51,253	104,804
2022/2021	149,155	140,727
2021/2020	64,761	12,188
2020/2019	9,441	9,747
2019/2018	4,939	23,811
Prior	22,548	13,138
Revolving	2,883	13,235
Revolving to Term	0	0
Loans	304,980	317,650
Commercial real estate | Construction & land development | Grade 5
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	0	37
2022/2021	23	0
2021/2020	3,044	0
2020/2019	1,264	14
2019/2018	504	0
Prior	88	95
Revolving	0	0
Revolving to Term	0	0
Loans	4,923	146
Commercial real estate | Construction & land development | Grade 7
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	46	33
2022/2021	0	0
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
Prior	86	771
Revolving	75	0
Revolving to Term	0	0
Loans	207	804
Residential
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
Loans	1,443,719	1,308,659
Residential | Residential first mortgage
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	164,945	320,276
2022/2021	390,924	273,098
2021/2020	249,661	149,042
2020/2019	132,495	71,838
2019/2018	59,579	33,677
Prior	168,616	166,921
Revolving	887	2,080
Revolving to Term	2	3
Loans	1,167,109	1,016,935
Residential | Residential first mortgage | Grades 1-4
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	164,917	318,628
2022/2021	389,246	272,011
2021/2020	247,957	147,857
2020/2019	130,857	68,975
2019/2018	56,223	31,208
Prior	162,424	162,153
Revolving	887	2,080
Revolving to Term	2	3
Loans	1,152,513	1,002,915
Residential | Residential first mortgage | Grade 5
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	0	1,494
2022/2021	1,286	758
2021/2020	1,088	997
2020/2019	1,250	1,803
2019/2018	2,239	2,272
Prior	2,913	465
Revolving	0	0
Revolving to Term	0	0
Loans	8,776	7,789
Residential | Residential first mortgage | Grade 6
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022		0
2022/2021		0
2021/2020		0
2020/2019		711
2019/2018		0
Prior		0
Revolving		0
Revolving to Term		0
Loans		711
Residential | Residential first mortgage | Grade 7
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	28	154
2022/2021	392	329
2021/2020	616	188
2020/2019	388	349
2019/2018	1,117	197
Prior	3,279	4,303
Revolving	0	0
Revolving to Term	0	0
Loans	5,820	5,520
Residential | Residential junior mortgage
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	14,051	10,119
2022/2021	7,308	4,786
2021/2020	4,255	5,207
2020/2019	4,187	3,151
2019/2018	2,753	1,573
Prior	3,936	3,576
Revolving	158,052	143,158
Revolving to Term	6,342	5,762
Loans	200,884	177,332
Residential | Residential junior mortgage | Grades 1-4
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	14,020	10,119
2022/2021	7,277	4,580
2021/2020	4,053	5,207
2020/2019	4,187	3,151
2019/2018	2,753	1,573
Prior	3,909	3,409
Revolving	157,960	142,784
Revolving to Term	6,342	5,762
Loans	200,501	176,585
Residential | Residential junior mortgage | Grade 5
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022		0
2022/2021		0
2021/2020		0
2020/2019		0
2019/2018		0
Prior		143
Revolving		165
Revolving to Term		0
Loans		308
Residential | Residential junior mortgage | Grade 7
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	31	0
2022/2021	31	206
2021/2020	202	0
2020/2019	0	0
2019/2018	0	0
Prior	27	24
Revolving	92	209
Revolving to Term	0	0
Loans	383	439
Residential | Residential construction
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	57,033	92,417
2022/2021	13,035	16,774
2021/2020	3,316	966
2020/2019	1,118	123
2019/2018	130	336
Prior	1,094	229
Revolving	0	3,547
Revolving to Term	0	0
Loans	75,726	114,392
Residential | Residential construction | Grades 1-4
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract]
2023/2022	57,033	92,417
2022/2021	13,035	16,774
2021/2020	3,316	966
2020/2019	1,118	123
2019/2018	130	336
Prior	1,094	229
Revolving	0	3,547
Revolving to Term	0	0
Loans	$ 75,726	$ 114,392