ALLOWANCE FOR CREDIT LOSSES - Loans by risk grades and loan class (Details) - USD ($)	Sep. 30, 2022	Dec. 31, 2021
Amortized cost of loans by loan type
Total gross loans	$ 3,135,891,000	$ 2,876,427,000
Pass
Amortized cost of loans by loan type
Total gross loans	3,074,091,000	2,783,385,000
Special Mention
Amortized cost of loans by loan type
Total gross loans	2,582,000	12,807,000
Substandard
Amortized cost of loans by loan type
Total gross loans	59,218,000	80,235,000
Doubtful
Amortized cost of loans by loan type
Total gross loans	0
Commercial and industrial
Amortized cost of loans by loan type
Total gross loans	568,071,000	634,384,000
Commercial and industrial | Loans by risk grades
Amortized cost of loans by loan type
Total gross loans	568,071,000	634,384,000
Commercial and industrial | Pass
Amortized cost of loans by loan type
Total gross loans	555,541,000	613,419,000
Commercial and industrial | Special Mention
Amortized cost of loans by loan type
Total gross loans		3,482,000
Commercial and industrial | Substandard
Amortized cost of loans by loan type
Total gross loans	12,530,000	17,483,000
Commercial real estate
Amortized cost of loans by loan type
Total gross loans	1,242,118,000	1,091,969,000
Commercial real estate | Loans by risk grades
Amortized cost of loans by loan type
Total gross loans	1,242,118,000	1,091,969,000
Commercial real estate | Pass
Amortized cost of loans by loan type
Total gross loans	1,209,994,000	1,038,401,000
Commercial real estate | Special Mention
Amortized cost of loans by loan type
Total gross loans	2,161,000	8,855,000
Commercial real estate | Substandard
Amortized cost of loans by loan type
Total gross loans	29,963,000	44,713,000
Construction and development
Amortized cost of loans by loan type
Total gross loans	507,570,000	460,719,000
Construction and development | Loans by risk grades
Amortized cost of loans by loan type
Total gross loans	507,570,000	460,719,000
Construction and development | Pass
Amortized cost of loans by loan type
Total gross loans	496,685,000	447,533,000
Construction and development | Special Mention
Amortized cost of loans by loan type
Total gross loans	421,000	470,000
Construction and development | Substandard
Amortized cost of loans by loan type
Total gross loans	10,464,000	12,716,000
1-4 family residential
Amortized cost of loans by loan type
Total gross loans	288,456,000	277,273,000
1-4 family residential | Loans by risk grades
Amortized cost of loans by loan type
Total gross loans	288,456,000	277,273,000
1-4 family residential | Pass
Amortized cost of loans by loan type
Total gross loans	282,486,000	272,217,000
1-4 family residential | Substandard
Amortized cost of loans by loan type
Total gross loans	5,970,000	5,056,000
Multifamily residential
Amortized cost of loans by loan type
Total gross loans	370,391,000	286,396,000
Multifamily residential | Loans by risk grades
Amortized cost of loans by loan type
Total gross loans	370,391,000	286,396,000
Multifamily residential | Pass
Amortized cost of loans by loan type
Total gross loans	370,391,000	286,396,000
Consumer
Amortized cost of loans by loan type
Total gross loans	24,509,000	28,090,000
Consumer | Loans by risk grades
Amortized cost of loans by loan type
Total gross loans	24,509,000	28,090,000
Consumer | Pass
Amortized cost of loans by loan type
Total gross loans	24,278,000	27,865,000
Consumer | Substandard
Amortized cost of loans by loan type
Total gross loans	231,000	225,000
Agriculture
Amortized cost of loans by loan type
Total gross loans	11,185,000	7,941,000
Agriculture | Loans by risk grades
Amortized cost of loans by loan type
Total gross loans	11,185,000	7,941,000
Agriculture | Pass
Amortized cost of loans by loan type
Total gross loans	11,126,000	7,899,000
Agriculture | Substandard
Amortized cost of loans by loan type
Total gross loans	59,000	42,000
Other
Amortized cost of loans by loan type
Total gross loans	123,591,000	$ 89,655,000
Other | Pass
Amortized cost of loans by loan type
Total gross loans	123,590,000
Other | Substandard
Amortized cost of loans by loan type
Total gross loans	$ 1,000