LOANS AND ALLOWANCE - Narrative (Details)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) loan_segment	Jun. 30, 2023 USD ($)	Dec. 31, 2023 USD ($)	Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for sale	$ 32,292,000		$ 32,292,000		$ 18,934,000
Loans	12,639,650,000		12,639,650,000		12,486,027,000
Interest income recognized on non-accrual loans	0	$ 0	$ 0	$ 0
Number of loan segments | loan_segment			10
Allowance for credit losses increase (decrease)	(15,100,000)		$ (15,400,000)
Net charge-offs	39,600,000		41,900,000
Provision expense	$ 24,500,000	0	$ 26,500,000	0
Standby letters of credit usual term	2 years		2 years
Increase (decrease) in provision	$ 0	0	$ 0	0	3,800,000
Off-balance sheet commitments	19,500,000	$ 23,300,000	19,500,000	$ 23,300,000	19,500,000	$ 19,500,000	$ 23,300,000	$ 23,300,000
Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	3,949,817,000		3,949,817,000		3,670,948,000
Commercial real estate, non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	2,323,533,000		2,323,533,000		2,400,839,000
Commercial real estate, owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,174,195,000		1,174,195,000		1,162,083,000
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	823,267,000		823,267,000		957,545,000
Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	98,200,000		98,200,000		79,200,000
Increase (decrease) in past due loans			18,900,000
30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	29,083,000		29,083,000		34,075,000
Increase (decrease) in past due loans			(5,000,000)
30-59 Days Past Due | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	6,014,000		6,014,000		5,021,000
Increase (decrease) in past due loans			1,000,000
30-59 Days Past Due | Commercial real estate, non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,789,000		1,789,000		12,995,000
Increase (decrease) in past due loans			(11,200,000)
30-59 Days Past Due | Commercial real estate, owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	3,237,000		3,237,000		0
Increase (decrease) in past due loans			3,200,000
30-59 Days Past Due | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	0		0		0
60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	30,178,000		30,178,000		11,189,000
Increase (decrease) in past due loans			19,000,000
60-89 Days Past Due | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	463,000		463,000		1,622,000
60-89 Days Past Due | Commercial real estate, non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,799,000		1,799,000		195,000
60-89 Days Past Due | Commercial real estate, owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	0		0		104,000
60-89 Days Past Due | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	21,203,000		21,203,000		1,957,000
Increase (decrease) in past due loans			19,200,000
90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	38,930,000		38,930,000		33,980,000
Increase (decrease) in past due loans			5,000,000
90 Days or More Past Due | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	10,354,000		10,354,000		6,858,000
Increase (decrease) in past due loans			3,500,000
90 Days or More Past Due | Commercial real estate, non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	13,084,000		13,084,000		11,465,000
Increase (decrease) in past due loans			1,600,000
90 Days or More Past Due | Commercial real estate, owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	442,000		442,000		110,000
90 Days or More Past Due | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 0		$ 0		$ 0