ALLOWANCE FOR CREDIT LOSSES - Loans by risk grades, loan class and vintage (Details) - USD ($)	Jun. 30, 2022	Dec. 31, 2021
Financing Receivable, Recorded Investment [Line Items]
2022	$ 572,881,000
2021	754,616,000	$ 841,230,000
2020	364,495,000	406,444,000
2019	288,085,000	391,641,000
2018	214,218,000	294,205,000
2017		136,629,000
Prior	369,125,000	317,225,000
Revolving Loans	433,983,000	451,550,000
Converted revolving loan	44,572,000	37,503,000
Total Loans	3,041,975,000	2,876,427,000
Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Total Loans	581,443,000	634,384,000
Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total Loans	1,181,620,000	1,091,969,000
Construction and development
Financing Receivable, Recorded Investment [Line Items]
Total Loans	560,903,000	460,719,000
1-4 family residential
Financing Receivable, Recorded Investment [Line Items]
Total Loans	264,428,000	277,273,000
Multifamily residential
Financing Receivable, Recorded Investment [Line Items]
Total Loans	300,582,000	286,396,000
Consumer
Financing Receivable, Recorded Investment [Line Items]
Total Loans	26,810,000	28,090,000
Agriculture
Financing Receivable, Recorded Investment [Line Items]
Total Loans	8,036,000	7,941,000
Other:
Financing Receivable, Recorded Investment [Line Items]
Total Loans	118,153,000	89,655,000
Loans by risk grades | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
2022	69,349,000
2021	153,044,000	230,432,000
2020	39,999,000	54,758,000
2019	47,251,000	62,656,000
2018	23,616,000	28,149,000
2017		8,121,000
Prior	9,513,000	5,924,000
Revolving Loans	228,396,000	233,071,000
Converted revolving loan	10,275,000	11,273,000
Total Loans	581,443,000	634,384,000
Loans by risk grades | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
2022	292,206,000
2021	219,381,000	243,666,000
2020	185,972,000	200,578,000
2019	183,731,000	245,900,000
2018	108,285,000	164,081,000
2017		70,329,000
Prior	110,734,000	87,506,000
Revolving Loans	52,985,000	55,253,000
Converted revolving loan	28,326,000	24,656,000
Total Loans	1,181,620,000	1,091,969,000
Loans by risk grades | Construction and development
Financing Receivable, Recorded Investment [Line Items]
2022	112,617,000
2021	216,604,000	197,900,000
2020	94,053,000	100,182,000
2019	36,256,000	54,017,000
2018	6,154,000	8,627,000
2017		26,340,000
Prior	22,913,000	859,000
Revolving Loans	72,219,000	72,698,000
Converted revolving loan	87,000	96,000
Total Loans	560,903,000	460,719,000
Loans by risk grades | 1-4 family residential
Financing Receivable, Recorded Investment [Line Items]
2022	36,188,000
2021	107,718,000	115,451,000
2020	21,772,000	24,846,000
2019	13,561,000	20,724,000
2018	24,331,000	32,318,000
2017		21,733,000
Prior	53,089,000	53,717,000
Revolving Loans	5,992,000	8,018,000
Converted revolving loan	1,777,000	466,000
Total Loans	264,428,000	277,273,000
Loans by risk grades | Multifamily residential
Financing Receivable, Recorded Investment [Line Items]
2022	36,077,000
2021	18,573,000	16,744,000
2020	18,072,000	18,236,000
2019	5,808,000	6,473,000
2018	49,952,000	58,750,000
2017		9,784,000
Prior	171,527,000	167,033,000
Revolving Loans	573,000	9,376,000
Total Loans	300,582,000	286,396,000
Loans by risk grades | Consumer
Financing Receivable, Recorded Investment [Line Items]
2022	4,885,000
2021	3,878,000	6,427,000
2020	2,879,000	3,677,000
2019	836,000	1,199,000
2018	482,000	714,000
2017		277,000
Prior	121,000	11,000
Revolving Loans	12,654,000	15,006,000
Converted revolving loan	1,075,000	779,000
Total Loans	26,810,000	28,090,000
Loans by risk grades | Agriculture
Financing Receivable, Recorded Investment [Line Items]
2022	2,684,000
2021	1,032,000	2,954,000
2020	366,000	423,000
2019	29,000	42,000
2018	37,000	57,000
2017		35,000
Prior	44,000	18,000
Revolving Loans	3,706,000	4,222,000
Converted revolving loan	138,000	190,000
Total Loans	8,036,000	7,941,000
Loans by risk grades | Other:
Financing Receivable, Recorded Investment [Line Items]
2022	18,875,000
2021	34,386,000	27,656,000
2020	1,382,000	3,744,000
2019	613,000	630,000
2018	1,361,000	1,509,000
2017		10,000
Prior	1,184,000	2,157,000
Revolving Loans	57,458,000	53,906,000
Converted revolving loan	2,894,000	43,000
Total Loans	118,153,000	89,655,000
Pass
Financing Receivable, Recorded Investment [Line Items]
2022	572,791,000
2021	754,567,000	841,230,000
2020	359,254,000	400,127,000
2019	276,516,000	375,159,000
2018	192,575,000	262,223,000
2017		125,958,000
Prior	357,099,000	312,527,000
Revolving Loans	432,476,000	445,115,000
Converted revolving loan	27,461,000	21,046,000
Total Loans	2,972,739,000	2,783,385,000
Pass | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
2022	69,304,000
2021	153,044,000	230,432,000
2020	39,999,000	53,744,000
2019	44,432,000	60,514,000
2018	17,159,000	21,059,000
2017		8,117,000
Prior	9,174,000	5,533,000
Revolving Loans	227,008,000	228,247,000
Converted revolving loan	5,346,000	5,773,000
Total Loans	565,466,000	613,419,000
Pass | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
2022	292,206,000
2021	219,332,000	243,666,000
2020	183,074,000	197,625,000
2019	175,475,000	232,074,000
2018	93,993,000	141,591,000
2017		69,995,000
Prior	107,229,000	84,398,000
Revolving Loans	52,985,000	55,253,000
Converted revolving loan	17,746,000	13,799,000
Total Loans	1,142,040,000	1,038,401,000
Pass | Construction and development
Financing Receivable, Recorded Investment [Line Items]
2022	112,617,000
2021	216,604,000	197,900,000
2020	93,293,000	99,420,000
2019	36,256,000	54,017,000
2018	6,154,000	7,127,000
2017		16,133,000
Prior	15,237,000	142,000
Revolving Loans	72,219,000	72,698,000
Converted revolving loan	87,000	96,000
Total Loans	552,467,000	447,533,000
Pass | 1-4 family residential
Financing Receivable, Recorded Investment [Line Items]
2022	36,188,000
2021	107,718,000	115,451,000
2020	20,224,000	23,298,000
2019	13,067,000	20,210,000
2018	23,437,000	31,416,000
2017		21,607,000
Prior	52,599,000	53,253,000
Revolving Loans	5,992,000	6,516,000
Converted revolving loan	275,000	466,000
Total Loans	259,500,000	272,217,000
Pass | Multifamily residential
Financing Receivable, Recorded Investment [Line Items]
2022	36,077,000
2021	18,573,000	16,744,000
2020	18,072,000	18,236,000
2019	5,808,000	6,473,000
2018	49,952,000	58,750,000
2017		9,784,000
Prior	171,527,000	167,033,000
Revolving Loans	573,000	9,376,000
Total Loans	300,582,000	286,396,000
Pass | Consumer
Financing Receivable, Recorded Investment [Line Items]
2022	4,885,000
2021	3,878,000	6,427,000
2020	2,844,000	3,637,000
2019	836,000	1,199,000
2018	482,000	714,000
2017		277,000
Prior	121,000	11,000
Revolving Loans	12,579,000	14,921,000
Converted revolving loan	975,000	679,000
Total Loans	26,600,000	27,865,000
Pass | Agriculture
Financing Receivable, Recorded Investment [Line Items]
2022	2,684,000
2021	1,032,000	2,954,000
2020	366,000	423,000
2019	29,000	42,000
2018	37,000	57,000
2017		35,000
Prior	28,000
Revolving Loans	3,662,000	4,198,000
Converted revolving loan	138,000	190,000
Total Loans	7,976,000	7,899,000
Pass | Other:
Financing Receivable, Recorded Investment [Line Items]
2022	18,830,000
2021	34,386,000	27,656,000
2020	1,382,000	3,744,000
2019	613,000	630,000
2018	1,361,000	1,509,000
2017		10,000
Prior	1,184,000	2,157,000
Revolving Loans	57,458,000	53,906,000
Converted revolving loan	2,894,000	43,000
Total Loans	118,108,000	89,655,000
Special Mention
Financing Receivable, Recorded Investment [Line Items]
2020	468,000	470,000
2019		1,149,000
2018		7,949,000
Prior		62,000
Revolving Loans		3,177,000
Total Loans	468,000	12,807,000
Special Mention | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
2019		290,000
2018		15,000
Revolving Loans		3,177,000
Total Loans		3,482,000
Special Mention | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
2019		859,000
2018		7,934,000
Prior		62,000
Total Loans		8,855,000
Special Mention | Construction and development
Financing Receivable, Recorded Investment [Line Items]
2020	468,000	470,000
Total Loans	468,000	470,000
Substandard
Financing Receivable, Recorded Investment [Line Items]
2022	90,000
2021	49,000
2020	4,773,000	5,847,000
2019	11,569,000	15,333,000
2018	21,643,000	24,033,000
2017		10,671,000
Prior	12,026,000	4,636,000
Revolving Loans	1,507,000	3,258,000
Converted revolving loan	17,111,000	16,457,000
Total Loans	68,768,000	80,235,000
Substandard | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
2022	45,000
2020		1,014,000
2019	2,819,000	1,852,000
2018	6,457,000	7,075,000
2017		4,000
Prior	339,000	391,000
Revolving Loans	1,388,000	1,647,000
Converted revolving loan	4,929,000	5,500,000
Total Loans	15,977,000	17,483,000
Substandard | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
2021	49,000
2020	2,898,000	2,953,000
2019	8,256,000	12,967,000
2018	14,292,000	14,556,000
2017		334,000
Prior	3,505,000	3,046,000
Converted revolving loan	10,580,000	10,857,000
Total Loans	39,580,000	44,713,000
Substandard | Construction and development
Financing Receivable, Recorded Investment [Line Items]
2020	292,000	292,000
2018		1,500,000
2017		10,207,000
Prior	7,676,000	717,000
Total Loans	7,968,000	12,716,000
Substandard | 1-4 family residential
Financing Receivable, Recorded Investment [Line Items]
2020	1,548,000	1,548,000
2019	494,000	514,000
2018	894,000	902,000
2017		126,000
Prior	490,000	464,000
Revolving Loans		1,502,000
Converted revolving loan	1,502,000
Total Loans	4,928,000	5,056,000
Substandard | Consumer
Financing Receivable, Recorded Investment [Line Items]
2020	35,000	40,000
Revolving Loans	75,000	85,000
Converted revolving loan	100,000	100,000
Total Loans	210,000	225,000
Substandard | Agriculture
Financing Receivable, Recorded Investment [Line Items]
Prior	16,000	18,000
Revolving Loans	44,000	24,000
Total Loans	60,000	42,000
Substandard | Other:
Financing Receivable, Recorded Investment [Line Items]
2022	45,000
Total Loans	45,000
Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total Loans	$ 0	$ 0