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Regulatory Requirements and Restrictions (Tables)
 12 Months Ended
Dec. 31, 2016
Banking and Thrift [Abstract]  
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block]
The following tables provide information regarding regulatory capital for the Company and the Bank as of December 31, 2016 and 2015 (dollars in thousands):
 
2016
 
Actual
 
Required to be
Considered Well
Capitalized
 
Required to be
Considered
Adequately
Capitalized
 
Amount
 
Ratio
 
Amount
 
Ratio
 
Amount
 
Ratio
BankUnited, Inc.:
 

 
 

 
 

 
 

 
 

 
 

Tier 1 leverage
$
2,298,450

 
8.41
%
 
N/A (1)

 
N/A (1)

 
$
1,092,921

 
4.00
%
CET1 risk-based capital
$
2,298,450

 
11.63
%
 
$
1,284,498

 
6.50
%
 
$
889,268

 
4.50
%
Tier 1 risk-based capital
$
2,298,450

 
11.63
%
 
$
1,580,921

 
8.00
%
 
$
1,185,691

 
6.00
%
Total risk based capital
$
2,459,470

 
12.45
%
 
$
1,976,151

 
10.00
%
 
$
1,580,921

 
8.00
%
BankUnited:
 

 
 

 
 

 
 

 
 

 
 

Tier 1 leverage
$
2,534,402

 
9.30
%
 
$
1,361,959

 
5.00
%
 
$
1,089,567

 
4.00
%
CET1 risk-based capital
$
2,534,402

 
12.89
%
 
$
1,278,277

 
6.50
%
 
$
884,961

 
4.50
%
Tier 1 risk-based capital
$
2,534,402

 
12.89
%
 
$
1,573,265

 
8.00
%
 
$
1,179,948

 
6.00
%
Total risk based capital
$
2,694,048

 
13.70
%
 
$
1,966,581

 
10.00
%
 
$
1,573,265

 
8.00
%
 
2015
 
Actual
 
Required to be
Considered Well
Capitalized
 
Required to be
Considered
Adequately
Capitalized
 
Amount
 
Ratio
 
Amount
 
Ratio
 
Amount
 
Ratio
BankUnited, Inc.:
 

 
 

 
 

 
 

 
 

 
 

Tier 1 leverage
$
2,143,108

 
9.35
%
 
N/A (1)

 
N/A (1)

 
$
917,207

 
4.00
%
CET1 risk-based capital
$
2,143,108

 
12.58
%
 
$
1,107,156

 
6.50
%
 
$
766,492

 
4.50
%
Tier 1 risk-based capital
$
2,143,108

 
12.58
%
 
$
1,362,653

 
8.00
%
 
$
1,021,990

 
6.00
%
Total risk based capital
$
2,274,910

 
13.36
%
 
$
1,703,317

 
10.00
%
 
$
1,362,653

 
8.00
%
BankUnited:
 

 
 

 
 

 
 

 
 

 
 

Tier 1 leverage
$
2,377,689

 
10.41
%
 
$
1,141,845

 
5.00
%
 
$
913,476

 
4.00
%
CET1 risk-based capital
$
2,377,689

 
14.04
%
 
$
1,100,455

 
6.50
%
 
$
761,854

 
4.50
%
Tier 1 risk-based capital
$
2,377,689

 
14.04
%
 
$
1,354,406

 
8.00
%
 
$
1,015,805

 
6.00
%
Total risk based capital
$
2,507,430

 
14.81
%
 
$
1,693,008

 
10.00
%
 
$
1,354,406

 
8.00
%
 
 
 
 
 
 
 
 
 
 
 
 
(1) There is no Tier 1 leverage ratio component in the definition of a well-capitalized bank holding company.