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Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2018
Equity [Abstract]  
Summary of Required Regulatory Capital
At December 31, 2018 and 2017, the Company and Seacoast Bank, our 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
Purpose(1)
 
(Dollars in thousands)
 
Amount
 
Ratio
 
Amount
 
 
Ratio
Amount
 
 
Ratio
 
Seacoast Banking Corporation
 
 

 
 

 
 
 
 
 
 

 
 
 

 
(Consolidated)
 
 

 
 

 
 
 
 
 
 

 
 
 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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
%
 
At December 31, 2017:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Total Risk-Based Capital Ratio (to risk-weighted assets)
 
$
619,746

 
14.24
%
 
n/a

 
 
n/a

$
348,191

 
≥
8.00
%
 
Tier 1 Capital Ratio (to risk-weighted assets)
 
592,562

 
13.61
%
 
n/a

 
 
n/a

261,143

 
≥
6.00
%
 
Common Equity Tier 1 Capital Ratio (to risk-weighted assets)
 
523,832

 
12.04
%
 
n/a

 
 
n/a

195,858

 
≥
4.50
%
 
Leverage Ratio (to adjusted average assets)
 
592,562

 
10.68
%
 
n/a

 
 
n/a

221,863

 
≥
4.00
%
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Seacoast National Bank
 
 
 
 
 
 
 
 
 
 
 
 
 
 
(A Wholly Owned Bank Subsidiary)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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
%
 
At December 31, 2017:
 
 
 
 
 
 
 
≥
 
 
 
 
 
 
Total Risk-Based Capital Ratio (to risk-weighted assets)
 
$
565,149

 
13.04
%
 
$
433,475

 
≥
10.00
%
$
346,780

 
≥
8.00
%
 
Tier 1 Capital Ratio (to risk-weighted assets)
 
537,965

 
12.41
%
 
346,780

 
≥
8.00
%
260,085

 
≥
6.00
%
 
Common Equity Tier 1 Capital Ratio (to risk-weighted assets)
 
537,965

 
12.41
%
 
281,759

 
≥
6.50
%
195,022

 
≥
4.50
%
 
Leverage Ratio (to adjusted average assets)
 
537,965

 
9.72
%
 
276,791

 
≥
5.00
%
221,432

 
≥
4.00
%
 
 
(1)Excludes the capital conservation buffer of 1.875% for 2018 and 1.250% for 2017, which if not exceeded may constrain dividends, equity repurchases and compensation.
n/a - not applicable