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Regulatory Capital (Tables)
 12 Months Ended
Dec. 31, 2023
Banking And Thrift Disclosure [Abstract]  
Summary of Required Regulatory Capital
At December 31, 2023 and 2022, the Company and Seacoast Bank, its wholly-owned banking subsidiary, were both considered “well capitalized” based on the applicable U.S. regulatory capital ratio requirements as reflected in the table below:
   Minimum to meet
 “Well Capitalized” Requirements
Minimum for Capital Adequacy
Purpose1
(Dollars in thousands)AmountRatioAmountRatioAmountRatio
Seacoast Banking Corporation of Florida    
(Consolidated)    
At December 31, 2023:    
Total Risk-Based Capital Ratio$1,713,797 15.92 %n/an/a$861,355 ≥8.00 %
Tier 1 Capital Ratio 1,565,710 14.54 n/an/a646,017 ≥6.00 
Common Equity Tier 1 Capital Ratio1,493,499 13.87 n/an/a484,512 ≥4.50 
Leverage Ratio1,565,710 11.00 n/an/a569,317 ≥4.00 
At December 31, 2022:
Total Risk-Based Capital Ratio$1,454,168 15.79 %n/an/a$736,709 ≥8.00 %
Tier 1 Capital Ratio1,361,832 14.79 n/an/a552,532 ≥6.00 
Common Equity Tier 1 Capital Ratio1,277,295 13.87 n/an/a414,399 ≥4.50 
Leverage Ratio1,361,832 11.46 n/an/a475,134 ≥4.00 
Seacoast National Bank
(A Wholly Owned Bank Subsidiary)
At December 31, 2023:
Total Risk-Based Capital Ratio$1,593,431 14.82 %$1,075,494 ≥10.00 %$860,395 ≥8.00 %
Tier 1 Capital Ratio1,466,878 13.64 860,395 ≥8.00 645,296 ≥6.00 
Common Equity Tier 1 Capital Ratio1,466,874 13.64 699,071 ≥6.50 483,972 ≥4.50 
Leverage Ratio1,466,878 10.32 711,039 ≥5.00 568,831 ≥4.00 
At December 31, 2022:
Total Risk-Based Capital Ratio$1,330,836 14.47 %$919,904 ≥10.00 %$735,923 ≥8.00 %
Tier 1 Capital Ratio1,238,500 13.46 735,923 ≥8.00 551,942 ≥6.00 
Common Equity Tier 1 Capital Ratio1,238,496 13.46 597,938 ≥6.50 413,957 ≥4.50 
Leverage Ratio1,238,500 10.44 620,398 ≥5.00 496,318 ≥4.00 
1Excludes the Basel III capital conservation buffer of 2.5%, which if not exceeded may constrain dividends, equity repurchases and compensation.
n/a - not applicable.