LOANS AND ALLOWANCE FOR CREDIT LOSSES - Collateral Dependent (Details) - USD ($) $ in Thousands	Sep. 30, 2026	Jun. 30, 2026	Dec. 31, 2025	Sep. 30, 2025	Jun. 30, 2025	Dec. 31, 2024
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized Cost Basis	$ 8,886		$ 4,187
Related Allowance	25,213	$ 25,232	24,209	$ 23,645	$ 22,665	$ 21,388
Commercial and Industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized Cost Basis	2,817		693
Related Allowance	4,043	4,213	4,524	4,577	4,524	4,520
Commercial real estate:
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized Cost Basis	5,768		3,167
Related Allowance	16,465	16,198	14,363	13,738	12,714	11,214
Consumer Loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized Cost Basis	301		327
Related Allowance	2,268	$ 2,420	2,534	$ 2,697	$ 2,830	$ 3,395
Collateral Pledged
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized Cost Basis	6,283		2,173
Related Allowance	209		203
Commercial Real Estate And Business Assets \| Commercial and Industrial \| Commercial and industrial
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized Cost Basis	2,192		50
Related Allowance	0		0
Commercial Real Estate and Residential Real Estate \| Commercial real estate: \| Owner occupied commercial real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized Cost Basis	44		629
Related Allowance	0		4
Commercial Real Estate and Residential Real Estate \| Commercial real estate: \| Non-owner occupied commercial real estate
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized Cost Basis	3,746		1,167
Related Allowance	209		199
Residential Real Estate \| Consumer Loans \| Home equity lines and loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Amortized Cost Basis	301		327
Related Allowance	$ 0		$ 0