SUMMARY OF SIGNIFICANT ACCOUNTING AND REPORTING POLICIES (Details)	12 Months Ended
	Dec. 31, 2021 USD ($) banking_offices segment	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Organization and Basis of Presentation [Abstract]
Number of branches | banking_offices	56
Number of branches in grocery stores | banking_offices	13
Segment Information [Abstract]
Number of reportable segments | segment	1
Cash and Cash Equivalents [Abstract]
Cash on deposit with the Federal Reserve required to meet regulatory reserve and clearing requirements	$ 0	$ 0
Goodwill and Other Intangible Assets [Abstract]
Goodwill impairment loss	0	0
Amortization expense of intangible assets	2,849,000	3,617,000	$ 4,418,000
Derivative Instruments and Hedges, Assets [Abstract]
Debt Securities, Held-to-maturity, Allowance for Credit Loss	$ 0
Financing Receivable, Threshold Period Past Due	90 days
Financing Receivable, Threshold Period Past Due, Writeoff	120 days
Goodwill, Impaired, Accumulated Impairment Loss	$ 0	0
Equity balance	912,172,000	875,297,000	804,580,000	$ 731,291,000
Allowance for loan losses	35,273,000	49,006,000	24,797,000	27,019,000
Paycheck Protection Program
Derivative Instruments and Hedges, Assets [Abstract]
Allowance for loan losses	0
Retained  Earnings
Derivative Instruments and Hedges, Assets [Abstract]
Equity balance	179,813,000	111,208,000	80,274,000	64,797,000
Cumulative effect of accounting change
Derivative Instruments and Hedges, Assets [Abstract]
Equity balance			(7,830,000)	(16,452,000)
Cumulative effect of accounting change | Retained  Earnings
Derivative Instruments and Hedges, Assets [Abstract]
Equity balance			(7,830,000)	$ (16,452,000)
Core deposit intangible
Goodwill and Other Intangible Assets [Abstract]
Intangible assets, net	4,300,000
Trust relationship intangible
Goodwill and Other Intangible Assets [Abstract]
Intangible assets, net	2,500,000
Core Deposit Intangible and Trust Relationship Intangible [Member]
Goodwill and Other Intangible Assets [Abstract]
Amortization expense of intangible assets	$ 2,800,000	$ 3,500,000	$ 4,300,000
Premises | Minimum
Premises and Equipment [Abstract]
Estimated useful life	15 years
Premises | Maximum
Premises and Equipment [Abstract]
Estimated useful life	40 years
Equipment | Minimum
Premises and Equipment [Abstract]
Estimated useful life	3 years
Equipment | Maximum
Premises and Equipment [Abstract]
Estimated useful life	10 years