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Regulatory Matters - Schedule of Regulatory Capital (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Mar. 31, 2025
Dec. 31, 2024
Components of regulatory capital [Abstract]        
Total shareholders' equity $ 510,553 $ 502,951 $ 467,277 $ 454,686
Add (deduct)        
Accumulated other comprehensive loss for regulatory purposes (61,024) (57,688)    
Consolidated        
Components of regulatory capital [Abstract]        
Total shareholders' equity 510,553 502,951    
Add (deduct)        
Accumulated other comprehensive loss for regulatory purposes 55,226 51,890    
Goodwill and other intangibles (29,186) (29,301)    
Common equity tier 1 capital 536,593 525,540    
Qualifying trust preferred securities 38,657 38,640    
Tier 1 capital 575,250 564,180    
Allowance for credit losses and allowance for unfunded lending commitments limited to 1.25% of total risk-weighted assets 57,492 57,326    
Total risk-based capital 632,742 621,506    
Independent Bank        
Components of regulatory capital [Abstract]        
Total shareholders' equity 497,636 490,911    
Add (deduct)        
Accumulated other comprehensive loss for regulatory purposes 55,226 51,890    
Goodwill and other intangibles (29,186) (29,301)    
Common equity tier 1 capital 523,676 513,500    
Qualifying trust preferred securities 0 0    
Tier 1 capital 523,676 513,500    
Allowance for credit losses and allowance for unfunded lending commitments limited to 1.25% of total risk-weighted assets 57,414 57,250    
Total risk-based capital $ 581,090 $ 570,750