LOANS AND ALLOWANCE - Narrative (Details) - USD ($)		3 Months Ended		6 Months Ended
	Apr. 01, 2022	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021	Jan. 01, 2021
Receivables [Abstract]
Loans held for sale		$ 27,297,000		$ 27,297,000			$ 9,094,000
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		12,270,233,000		12,270,233,000			12,003,894,000
Loans with an origination year of 2021		2,821,004,000		2,821,004,000			2,680,834,000
Loans with an origination year of 2020		2,321,967,000		2,321,967,000			1,843,080,000
Interest income recognized on non-accrual loans				0	$ 0
Allowance for credit losses increase (decrease)		$ (1,900,000)	$ 30,300,000	$ (2,100,000)	30,900,000
CECL Day 1 PCD ACL			16,599,000		16,599,000
CECL Day 1 non-PCD provision for credit losses			13,955,000		13,955,000
Standby letters of credit usual term		2 years		2 years
Off-balance sheet commitments		$ 23,300,000	23,300,000	$ 23,300,000	23,300,000	$ 23,300,000	23,300,000	$ 20,500,000	$ 20,500,000
Provision for credit losses		0	$ 0	0	0
Cumulative Effect, Period of Adoption, Adjustment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Off-balance sheet commitments										$ 20,500,000
Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		70,600,000		70,600,000			51,000,000
Increase (decrease) in past due loans				19,600,000
30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		35,860,000		35,860,000			29,051,000
Increase (decrease) in past due loans				6,800,000
90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		29,070,000		29,070,000			16,021,000
Increase (decrease) in past due loans				13,000,000
Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		3,531,395,000		3,531,395,000			3,437,126,000
Loans with an origination year of 2021		661,810,000		661,810,000			576,080,000
Loans with an origination year of 2020		357,706,000		357,706,000			159,416,000
Commercial and industrial loans | Allowance on Collateral Dependent Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Increase (decrease) in individually evaluated for impairment				9,600,000
Net recoveries				10,900,000
Commercial and industrial loans | 30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		5,165,000		5,165,000			4,904,000
Commercial and industrial loans | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		9,821,000		9,821,000			2,474,000
Increase (decrease) in past due loans				7,300,000
Commercial real estate, non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		2,379,819,000		2,379,819,000			2,407,475,000
Loans with an origination year of 2021		555,310,000		555,310,000			615,408,000
Loans with an origination year of 2020		577,479,000		577,479,000			596,899,000
Commercial real estate, non-owner occupied | Allowance on Collateral Dependent Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Increase (decrease) in individually evaluated for impairment				8,000,000
Net recoveries				1,900,000
Commercial real estate, non-owner occupied | 30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		6,475,000		6,475,000			5,946,000
Commercial real estate, non-owner occupied | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		10,783,000		10,783,000			5,153,000
Increase (decrease) in past due loans				5,600,000
Commercial real estate, owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		1,179,739,000		1,179,739,000			1,246,528,000
Loans with an origination year of 2021		240,101,000		240,101,000			324,004,000
Loans with an origination year of 2020		297,710,000		297,710,000			335,062,000
Commercial real estate, owner occupied | Allowance on Collateral Dependent Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Increase (decrease) in individually evaluated for impairment				4,500,000
Commercial real estate, owner occupied | 30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		7,793,000		7,793,000			4,495,000
Increase (decrease) in past due loans				3,300,000
Commercial real estate, owner occupied | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		0		0			319,000
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		2,248,473,000		2,248,473,000			2,096,655,000
Loans with an origination year of 2021		726,091,000		726,091,000			494,049,000
Loans with an origination year of 2020		469,342,000		469,342,000			405,136,000
Residential | 30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		10,033,000		10,033,000			8,607,000
Increase (decrease) in past due loans				1,400,000
Residential | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		5,860,000		5,860,000			5,811,000
Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		614,366,000		614,366,000			630,632,000
Loans with an origination year of 2021		37,720,000		37,720,000			75,749,000
Loans with an origination year of 2020		68,450,000		68,450,000			14,621,000
Home equity | 30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		3,618,000		3,618,000			2,206,000
Increase (decrease) in past due loans				1,400,000
Home equity | 90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		$ 2,274,000		$ 2,274,000			$ 2,101,000
Level One
Accounts, Notes, Loans and Financing Receivable [Line Items]
CECL Day 1 PCD ACL					16,600,000
CECL Day 1 non-PCD provision for credit losses					$ 14,000,000
Provision for credit losses	$ 2,800,000