BALANCE SHEET OFFSETTING (Details) - USD ($) $ in Thousands	9 Months Ended
BALANCE SHEET OFFSETTING (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Offsetting Assets [Line Items]
Derivative Asset, Securities Purchased under Agreements to Resell, Securities Borrowed, Gross	$ 17,995		$ 25,757
Derivative Asset, Securities Purchased under Agreements to Resell, Securities Borrowed, Liability	0		0
Derivative Asset, Securities Purchased under Agreements to Resell, Securities Borrowed	17,995		25,757
Derivative Asset, Securities Purchased under Agreements to Resell, Securities Borrowed, Not Offset, Policy Election Deduction	0		0
Derivative Asset, Securities Purchased under Agreements to Resell, Securities Borrowed, Collateral, Obligation to Return Cash	(11,040)		(13,462)
Derivative Asset, Securities Purchased under Agreements to Resell, Securities Borrowed, Amount Offset Against Collateral	6,955		12,295
Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned, Gross	12,159		12,019
Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned, Asset	0		0
Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned	12,159		12,019
Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned, Not Offset, Policy Election Deduction	0		0
Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned, Collateral, Right to Reclaim Cash	2,665		232
Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned, Amount Offset Against Collateral	9,494		11,787
Securities Sold under Agreements to Repurchase, Gross	240,367		175,621
Securities Sold under Agreements to Repurchase, Asset	0		0
Securities Sold under Agreements to Repurchase	240,367		175,621
Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned, Collateral, Right to Reclaim Securities	240,367		175,621
Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Cash	0		0
Securities Sold under Agreements to Repurchase, Amount Offset Against Collateral	0		0
Net decrease in derivative collateral received from counterparties	(9,240)	$ (10,360)
Customer Loan Swap Dealer Bank [Member]
Offsetting Assets [Line Items]
Derivative Asset, Fair Value, Gross Asset	5,035		10,660
Derivative Asset, Fair Value, Gross Liability	0		0
Fair Value	5,035		10,660
Derivative Asset, Not Offset, Policy Election Deduction	0		0
Derivative, Collateral, Obligation to Return Cash	5,035		2,650
Derivative Asset, Fair Value, Amount Offset Against Collateral	0		8,010
Derivative Liability, Fair Value, Gross Liability	1,382		108
Derivative Liability, Fair Value, Gross Asset	0		0
Fair Value	1,382		108
Derivative Liability, Not Offset, Policy Election Deduction	0		0
Derivative, Collateral, Right to Reclaim Cash	0		0
Derivative Liability, Fair Value, Amount Offset Against Collateral	1,382		108
Customer Loan Swaps Commercial Customer [Member]
Offsetting Assets [Line Items]
Derivative Asset, Fair Value, Gross Asset	4,423		1,057
Derivative Asset, Fair Value, Gross Liability	0		0
Fair Value	4,423		1,057
Derivative Asset, Not Offset, Policy Election Deduction	0		0
Derivative, Collateral, Obligation to Return Cash	0		0
Derivative Asset, Fair Value, Amount Offset Against Collateral	4,423		1,057
Derivative Liability, Fair Value, Gross Liability	8,112		11,679
Derivative Liability, Fair Value, Gross Asset	0		0
Fair Value	8,112		11,679
Derivative Liability, Not Offset, Policy Election Deduction	0		0
Derivative, Collateral, Right to Reclaim Cash	0		0
Derivative Liability, Fair Value, Amount Offset Against Collateral	8,112		11,679
Interest rate contracts
Offsetting Assets [Line Items]
Derivative Asset, Fair Value, Gross Asset	8,537		14,040
Derivative Asset, Fair Value, Gross Liability	0		0
Fair Value	8,537		14,040
Derivative Asset, Not Offset, Policy Election Deduction	0		0
Derivative, Collateral, Obligation to Return Cash	(6,005)		(10,812)
Derivative Asset, Fair Value, Amount Offset Against Collateral	2,532		3,228
Derivative Liability, Fair Value, Gross Liability	2,665		232
Derivative Liability, Fair Value, Gross Asset	0		0
Fair Value	2,665		232
Derivative Liability, Not Offset, Policy Election Deduction	0		0
Derivative, Collateral, Right to Reclaim Cash	2,665		232
Derivative Liability, Fair Value, Amount Offset Against Collateral	$ 0		$ 0

CAMDEN NATIONAL CORP 10-Q