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Regulatory Matters (Tables)
 12 Months Ended
Dec. 31, 2018
Banking and Thrift [Abstract]  
Schedule of Actual Amounts and Ratios
The Company’s and the Bank’s actual capital amounts and ratios are presented in the table below:
 
Actual
 
Required
For Capital
Adequacy Purposes
 
Minimum Capital Adequacy With Capital Conservation Buffer
 
Required To Be Well
Capitalized under
Prompt Corrective
Action Provisions
 
Amount
 
Ratio
 
Amount
 
Ratio
 
Amount
 
Ratio
 
Amount
 
Ratio
 
(Dollars in thousands)
December 31, 2018
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Common equity tier 1 capital
(to risk-weighted assets):
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Company
$
1,458,344

 
11.44
%
 
$
573,723

 
4.50
%
 
$
812,774

 
6.375
%
 
 N/A

 
N/A

Bank
$
1,737,092

 
13.63
%
 
$
573,699

 
4.50
%
 
$
812,740

 
6.375
%
 
$
828,677

 
6.50
%
Total capital
(to risk-weighted assets):
 

 
 

 
 

 
 

 
 
 
 
 
 

 
 

Company
$
1,649,664

 
12.94
%
 
$
1,019,952

 
8.00
%
 
$
1,259,004

 
9.875
%
 
 N/A

 
N/A

Bank
$
1,830,385

 
14.36
%
 
$
1,019,910

 
8.00
%
 
$
1,258,951

 
9.875
%
 
$
1,274,887

 
10.00
%
Tier I capital
(to risk-weighted assets):
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Company
$
1,556,371

 
12.21
%
 
$
764,964

 
6.00
%
 
$
1,004,015

 
7.875
%
 
 N/A

 
N/A

Bank
$
1,737,092

 
13.63
%
 
$
764,932

 
6.00
%
 
$
812,740

 
7.875
%
 
$
1,019,910

 
8.00
%
Tier I capital
(to average assets):
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Company
$
1,556,371

 
10.55
%
 
$
590,176

 
4.00
%
 
N/A

 
N/A

 
N/A

 
N/A

Bank
$
1,737,092

 
11.76
%
 
$
590,639

 
4.00
%
 
N/A

 
N/A

 
$
738,299

 
5.00
%
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Actual
 
Required
For Capital
Adequacy Purposes
 
Minimum Capital Adequacy With Capital Conservation Buffer
 
Required To Be Well
Capitalized under
Prompt Corrective
Action Provisions
 
Amount
 
Ratio
 
Amount
 
Ratio
 
Amount
 
Ratio
 
Amount
 
Ratio
 
(Dollars in thousands)
December 31, 2017
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Common equity tier 1 capital
(to risk-weighted assets):
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Company
$
1,471,193

 
12.30
%
 
$
538,435

 
4.50
%
 
$
688,000

 
5.75
%
 
N/A

 
N/A

Bank
$
1,548,401

 
12.95
%
 
$
538,178

 
4.50
%
 
$
687,672

 
5.75
%
 
$
777,368

 
6.50
%
Total capital
(to risk-weighted assets):
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Company
$
1,653,521

 
13.82
%
 
$
957,217

 
8.00
%
 
$
1,106,782

 
9.25
%
 
N/A

 
N/A

Bank
$
1,633,778

 
13.66
%
 
$
956,761

 
8.00
%
 
$
1,106,255

 
9.25
%
 
$
1,195,951

 
10.00
%
Tier I capital
(to risk-weighted assets):
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Company
$
1,568,144

 
13.11
%
 
$
717,913

 
6.00
%
 
$
867,478

 
7.25
%
 
N/A

 
N/A

Bank
$
1,548,401

 
12.95
%
 
$
717,571

 
6.00
%
 
$
687,672

 
7.25
%
 
$
956,761

 
8.00
%
Tier I capital
(to average assets):
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Company
$
1,568,144

 
11.54
%
 
$
543,528

 
4.00
%
 
N/A

 
N/A

 
N/A

 
N/A

Bank
$
1,548,401

 
11.40
%
 
$
543,441

 
4.00
%
 
N/A

 
N/A

 
$
679,301

 
5.00
%