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Regulatory Matters - Schedule of Regulatory Capital (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Jun. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Dec. 31, 2023
Components of regulatory capital [Abstract]            
Total shareholders' equity $ 490,742 $ 469,250 $ 454,686 $ 452,369 $ 430,459 $ 404,449
Add (deduct)            
Accumulated other comprehensive loss for regulatory purposes (60,630)   (69,944)      
Subordinated debt 0   39,586      
Consolidated            
Components of regulatory capital [Abstract]            
Total shareholders' equity 490,742   454,686      
Add (deduct)            
Accumulated other comprehensive loss for regulatory purposes 54,832   64,146      
Goodwill and other intangibles (29,423)   (29,788)      
Common equity tier 1 capital 516,151   489,044      
Qualifying trust preferred securities 38,623   38,572      
Tier 1 capital 554,774   527,616      
Subordinated debt 0   40,000      
Allowance for credit losses and allowance for unfunded lending commitments limited to 1.25% of total risk-weighted assets 56,034   54,828      
Total risk-based capital 610,808   622,444      
Independent Bank            
Components of regulatory capital [Abstract]            
Total shareholders' equity 480,475   478,188      
Add (deduct)            
Accumulated other comprehensive loss for regulatory purposes 54,832   64,146      
Goodwill and other intangibles (29,423)   (29,788)      
Common equity tier 1 capital 505,884   512,546      
Qualifying trust preferred securities 0   0      
Tier 1 capital 505,884   512,546      
Subordinated debt 0   0      
Allowance for credit losses and allowance for unfunded lending commitments limited to 1.25% of total risk-weighted assets 55,956   54,708      
Total risk-based capital $ 561,840   $ 567,254