Shareholders' Equity (Tables)

12 Months Ended

Dec. 31, 2019

Equity [Abstract]

Summary of Required Regulatory Capital

At December 31, 2019 and 2018, 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)	Amount		Ratio		Amount			Ratio		Amount			Ratio
Seacoast Banking Corporation of Florida
(Consolidated)
At December 31, 2019:
Total Risk-Based Capital Ratio (to risk-weighted assets)	$	860,934	15.71	%	n/a			n/a		$	438,506	≥	8.00	%
Tier 1 Capital Ratio (to risk-weighted assets)	825,640		15.06		n/a			n/a		328,880		≥	6.00
Common Equity Tier 1 Capital Ratio (to risk-weighted assets)	754,555		13.77		n/a			n/a		246,660		≥	4.50
Leverage Ratio (to adjusted average assets)	825,640		12.20		n/a			n/a		270,788		≥	4.00
At December 31, 2018:
Total Risk-Based Capital Ratio (to risk-weighted assets)	$	744,687	14.43	%	n/a			n/a		$	412,754	≥	8.00	%
Tier 1 Capital Ratio (to risk-weighted assets)	712,144		13.80		n/a			n/a		309,566		≥	6.00
Common Equity Tier 1 Capital Ratio (to risk-weighted assets)	641,340		12.43		n/a			n/a		232,174		≥	4.50
Leverage Ratio (to adjusted average assets)	712,144		11.16		n/a			n/a		255,167		≥	4.00
Seacoast National Bank
(A Wholly Owned Bank Subsidiary)
At December 31, 2019:
Total Risk-Based Capital Ratio (to risk-weighted assets)	$	804,058	14.68	%	$	547,440	≥	10.00	%	$	437,952	≥	8.00	%
Tier 1 Capital Ratio (to risk-weighted assets)	768,764		14.04		437,952		≥	8.00		328,464		≥	6.00
Common Equity Tier 1 Capital Ratio (to risk-weighted assets)	768,764		14.04		355,836		≥	6.50		246,348		≥	4.50
Leverage Ratio (to adjusted average assets)	768,764		11.38		337,787		≥	5.00		270,230		≥	4.00
At December 31, 2018:
Total Risk-Based Capital Ratio (to risk-weighted assets)	$	701,093	13.60	%	$	515,607	≥	10.00	%	$	412,486	≥	8.00	%
Tier 1 Capital Ratio (to risk-weighted assets)	668,550		12.97		412,486		≥	8.00		309,364		≥	6.00
Common Equity Tier 1 Capital Ratio (to risk-weighted assets)	668,550		12.97		335,145		≥	6.50		232,023		≥	4.50
Leverage Ratio (to adjusted average assets)	668,550		10.49		318,795		≥	5.00		255,036		≥	4.00
1Excludes the Basel III capital conservation buffer of 2.5% for 2019 and 1.875% for 2018, which if not exceeded may constrain dividends, equity repurchases and compensation.
n/a - not applicable