LOANS AND ALLOWANCE - Narrative (Details) - USD ($)		3 Months Ended		9 Months Ended
	Apr. 01, 2022	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2022	Dec. 31, 2021	Jan. 01, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for sale		$ 30,972,000		$ 30,972,000			$ 9,094,000
Loans		12,271,422,000		12,271,422,000			12,003,894,000
Interest income recognized on non-accrual loans		0	$ 0	0	$ 0
Allowance for credit losses increase (decrease)		(15,400,000)	427,000,000,000	(17,500,000)	31,300,000
Loans charged off		20,911,000	888,000	24,330,000	2,785,000
Provision for credit losses		$ 5,000,000	0	$ 5,000,000	0
CECL Day 1 PCD ACL					16,599,000
CECL Day 1 non-PCD provision for credit losses					13,955,000
Standby letters of credit usual term		2 years		2 years
Off-balance sheet commitments		$ 20,300,000	23,300,000	$ 20,300,000	23,300,000	$ 23,300,000	23,300,000	$ 23,300,000	$ 20,500,000
Increase (decrease) in provision		(3,000,000)	$ 0	(3,000,000)	0
Adoption of the CECL
Accounts, Notes, Loans and Financing Receivable [Line Items]
Off-balance sheet commitments										$ 20,500,000
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
Increase (decrease) in provision	$ 2,800,000
Commercial and industrial loan one
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans charged off		13,700,000
Commercial and industrial loan two
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans charged off		5,400,000
Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		3,490,953,000		3,490,953,000			3,437,126,000
Commercial real estate, owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		1,153,707,000		1,153,707,000			1,246,528,000
Commercial real estate, non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		2,360,596,000		2,360,596,000			2,407,475,000
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		2,257,385,000		2,257,385,000			2,096,655,000
Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		76,300,000		76,300,000			51,000,000
Increase in past due loans				25,300,000
30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		25,844,000		25,844,000			29,051,000
Increase in past due loans				3,200,000
30-59 Days Past Due | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		4,005,000		4,005,000			4,904,000
30-59 Days Past Due | Commercial real estate, owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		2,368,000		2,368,000			4,495,000
30-59 Days Past Due | Commercial real estate, non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		4,603,000		4,603,000			5,946,000
30-59 Days Past Due | Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		10,884,000		10,884,000			8,607,000
60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		18,661,000		18,661,000			5,935,000
Increase in past due loans				12,700,000
60-89 Days Past Due | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		3,224,000		3,224,000			434,000
Increase in past due loans				2,800,000
60-89 Days Past Due | Commercial real estate, owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		1,225,000		1,225,000			0
Increase in past due loans				1,200,000
60-89 Days Past Due | Commercial real estate, non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		1,913,000		1,913,000			881,000
60-89 Days Past Due | Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		10,405,000		10,405,000			2,278,000
Increase in past due loans				8,100,000
90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		31,778,000		31,778,000			16,021,000
Increase in past due loans				15,800,000
90 Days or More Past Due | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		9,356,000		9,356,000			2,474,000
Increase in past due loans				6,900,000
90 Days or More Past Due | Commercial real estate, owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		85,000		85,000			319,000
90 Days or More Past Due | Commercial real estate, non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		11,078,000		11,078,000			5,153,000
Increase in past due loans				5,900,000
90 Days or More Past Due | Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans		$ 8,912,000		8,912,000			$ 5,811,000
Increase in past due loans				$ 3,100,000