LOANS AND ALLOWANCE FOR CREDIT LOSSES - Narrative (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2025 USD ($) loan_segment	Sep. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for sale	$ 23,190,000		$ 23,190,000		$ 18,663,000
Loans	13,591,174,000		13,591,174,000		12,854,359,000
Interest income recognized on non-accrual loans	0	$ 0	0	$ 0
Payment default			$ 5,000,000	2,900,000
Number of loan segments | loan_segment			10
Allowance for credit losses (decrease) increase	(800,000)		$ 1,700,000
Net charge-offs	(5,100,000)		(12,400,000)
Provision for credit losses	$ 4,300,000	5,000,000	$ 14,100,000	31,500,000
Standby letters of credit usual term	2 years		2 years
Off-balance sheet commitments	$ 18,000,000		$ 18,000,000		18,000,000
Provision for credit losses - unfunded commitments	0	$ 0	0	$ 0
Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	789,021,000		789,021,000		792,144,000
Commercial real estate, owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,232,117,000		1,232,117,000		1,157,944,000
Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	4,604,895,000		4,604,895,000		4,114,292,000
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	2,412,783,000		2,412,783,000		2,374,729,000
Commercial real estate, non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	2,304,889,000		2,304,889,000		2,274,016,000
Allowance on Collateral Dependent Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Increase (decrease) in individually evaluated for impairment			(3,400,000)
Increase (decrease) allowance for credit loss, recovery			2,700,000
Allowance on Collateral Dependent Loans | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Increase (decrease) in individually evaluated for impairment			(9,800,000)
Allowance on Collateral Dependent Loans | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Increase (decrease) in individually evaluated for impairment			13,600,000
Increase (decrease) allowance for credit loss, recovery			2,800,000
Allowance on Collateral Dependent Loans | Commercial real estate, non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Increase (decrease) in individually evaluated for impairment			(6,200,000)
Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	156,400,000		156,400,000		116,200,000
Increase (decrease) in past due loans			40,200,000
30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	83,468,000		83,468,000		35,773,000
Increase (decrease) in past due loans			47,700,000
30-59 Days Past Due | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	47,341,000		47,341,000		4,332,000
Increase (decrease) in past due loans			43,000,000
30-59 Days Past Due | Commercial real estate, owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	9,037,000		9,037,000		3,783,000
Increase (decrease) in past due loans			5,300,000
30-59 Days Past Due | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,848,000		1,848,000		7,428,000
30-59 Days Past Due | Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	13,926,000		13,926,000		12,302,000
30-59 Days Past Due | Commercial real estate, non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	5,727,000		5,727,000		2,407,000
60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	24,468,000		24,468,000		32,581,000
Increase (decrease) in past due loans			(8,100,000)
60-89 Days Past Due | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	0		0		22,005,000
Increase (decrease) in past due loans			(22,000,000)
60-89 Days Past Due | Commercial real estate, owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	564,000		564,000		0
60-89 Days Past Due | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	5,488,000		5,488,000		473,000
Increase (decrease) in past due loans			5,000,000
60-89 Days Past Due | Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	11,279,000		11,279,000		6,606,000
Increase (decrease) in past due loans			4,700,000
60-89 Days Past Due | Commercial real estate, non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	4,907,000		4,907,000		1,718,000
Increase (decrease) in past due loans			3,200,000
90 Days or More Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	48,448,000		48,448,000		47,809,000
Increase (decrease) in past due loans			600,000
90 Days or More Past Due | Construction
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	12,922,000		12,922,000		3,988,000
Increase (decrease) in past due loans			8,900,000
90 Days or More Past Due | Commercial real estate, owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	5,740,000		5,740,000		300,000
Increase (decrease) in past due loans			5,400,000
90 Days or More Past Due | Commercial and industrial loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	5,850,000		5,850,000		9,786,000
Increase (decrease) in past due loans			(3,900,000)
90 Days or More Past Due | Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	18,737,000		18,737,000		18,819,000
90 Days or More Past Due | Commercial real estate, non-owner occupied
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 1,901,000		1,901,000		$ 10,342,000
Increase (decrease) in past due loans			$ (8,400,000)