ACQUISITIONS - Fair Value (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2022	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021	Dec. 31, 2020
Liabilities assumed
Goodwill recognized	$ 30,400	$ 30,400	$ 30,588	$ 24,191	$ 24,191
Total loans held for investment	2,150,148	2,150,148	1,954,168
Acquisition cost	347	874
Cash, Securities and Other
Liabilities assumed
Total loans held for investment	180,738	180,738	261,190
Construction and Development
Liabilities assumed
Total loans held for investment	162,426	162,426	178,716
1-4 Family Residential
Liabilities assumed
Total loans held for investment	732,725	732,725	580,872
Non-Owner Occupied CRE
Liabilities assumed
Total loans held for investment	489,111	489,111	482,622
Owner Occupied CRE
Liabilities assumed
Total loans held for investment	224,597	224,597	212,426
Commercial. and Industrial.
Liabilities assumed
Total loans held for investment	312,696	312,696	203,584
PPP Loans
Liabilities assumed
Total loans held for investment	10,700	10,700	46,800
Simmons Bank
Liabilities assumed
Total loans held for investment	$ 287,600	$ 287,600	356,700
Teton Financial Services
Business Acquisition [Line Items]
Cash consideration			11,501
Common stock issued			39,818
Total fair value of consideration transferred			51,319
Assets acquired
Cash and cash equivalents			132,498
Available-for-sale securities, at fair value			18,058
Correspondant bank stock, at cost			928
Mortgage loans held for sale			840
Loans			251,418
Premises and equipment			17,758
Accrued interest receivable			923
Accounts receivable			95
Other receivable			520
Core deposit intangible			1,962
Other assets			468
Assets held for sale			120
Total assets acquired			425,588
Liabilities assumed
Deposits			379,198
Accrued interest payable			26
Other liabilities			1,283
Deferred tax liabilities/(assets), net			(29)
Total liabilities assumed			380,478
Net assets acquired			45,110
Goodwill recognized			6,209
Teton Financial Services | Provisional Estimates
Business Acquisition [Line Items]
Cash consideration			11,501
Common stock issued			39,818
Total fair value of consideration transferred			51,319
Assets acquired
Cash and cash equivalents			132,498
Available-for-sale securities, at fair value			18,058
Correspondant bank stock, at cost			928
Mortgage loans held for sale			840
Loans			252,275
Premises and equipment			17,758
Accrued interest receivable			923
Accounts receivable			95
Other receivable			520
Core deposit intangible			1,264
Other assets			226
Assets held for sale			115
Total assets acquired			425,500
Liabilities assumed
Deposits			379,227
Accrued interest payable			26
Other liabilities			1,283
Deferred tax liabilities/(assets), net			42
Total liabilities assumed			380,578
Net assets acquired			44,922
Goodwill recognized			6,397
Teton Financial Services | Measurement Period Adjustments
Assets acquired
Loans			(857)
Core deposit intangible			698
Other assets			242
Assets held for sale			5
Total assets acquired			88
Liabilities assumed
Deposits			(29)
Deferred tax liabilities/(assets), net			(71)
Total liabilities assumed			(100)
Net assets acquired			188
Goodwill recognized			$ (188)
Core deposit
Liabilities assumed
Estimated life		10 years