Cover Page - shares	9 Months Ended
	Sep. 30, 2025	Nov. 04, 2025	Dec. 31, 2024
Entity Information [Line Items]
Document Transition Report	false
Common Stock, Shares, Outstanding	49,787,305		42,500,611
Security Exchange Name	NASDAQ
Title of 12(b) Security	Common Stock, $0.01 par value per share
Trading Symbol	INDB
Entity Incorporation, State or Country Code	MA
Entity File Number	1-9047
Document Quarterly Report	true
Entity Registrant Name	Independent Bank Corp.
Entity Tax Identification Number	04-2870273
Entity Central Index Key	0000776901
Document Type	10-Q
Document Period End Date	Sep. 30, 2025
Amendment Flag	false
Document Fiscal Year Focus	2025
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Address, Address Line One	2036 Washington Street,
Entity Address, City or Town	Hanover,
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	02339
Entity Shell Company	false
City Area Code	781
Local Phone Number	878-6100
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Common Stock, Shares Outstanding		49,577,265
Mailing Address [Member]
Entity Information [Line Items]
Entity Address, Address Line One	288 Union Street,
Entity Address, City or Town	Rockland,
Entity Address, State or Province	MA