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Regulatory Matters (Tables)
 6 Months Ended
Jun. 30, 2019
Banking and Thrift [Abstract]  
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations
The Company’s and the Bank’s levels and ratios are presented in the table below for the dates indicated:
 
Actual
 
Required
For Capital
Adequacy Purposes
 
Minimum Capital Adequacy With Capital Conservation Buffer
 
Required
To Be Well
Capitalized Under
Prompt Corrective
Action Provisions
As of June 30, 2019
Amount
 
Ratio
 
Amount
 
Ratio
 
Amount
 
Ratio
 
Amount
 
Ratio
 
(Dollars in thousands)
Common equity Tier 1 capital
(to risk weighted assets):
 
 
 
 
 
 
 
 
 
 
 
 
Company
$
1,512,921

 
11.90
%
 
$
572,206

 
4.50
%
 
$
890,098

 
7.00
%
 
 N/A

 
 N/A

Bank
$
1,784,216

 
14.03
%
 
$
572,138

 
4.50
%
 
$
889,992

 
7.00
%
 
$
826,421

 
6.50
%
Total capital
(to risk-weighted assets):
 
 
 
 
 
 
 
 
 
 
 
 
Company
$
1,706,299

 
13.42
%
 
$
1,017,255

 
8.00
%
 
$
1,335,147

 
10.50
%
 
 N/A

 
 N/A

Bank
$
1,879,018

 
14.78
%
 
$
1,017,134

 
8.00
%
 
$
1,334,988

 
10.50
%
 
$
1,271,417

 
10.00
%
Tier 1 capital
(to risk-weighted assets):
 
 
 
 
 
 
 
 
 
 
 
 
Company
$
1,611,497

 
12.67
%
 
$
762,941

 
6.00
%
 
$
1,080,833

 
8.50
%
 
 N/A

 
 N/A

Bank
$
1,784,216

 
14.03
%
 
$
762,850

 
6.00
%
 
$
889,992

 
8.50
%
 
$
1,017,134

 
8.00
%
Tier 1 capital
(to average assets):
 
 
 
 
 
 
 
 
 
 
 
 
Company
$
1,611,497

 
10.94
%
 
$
589,066

 
4.00
%
 
N/A

 
N/A

 
 N/A

 
 N/A

Bank
$
1,784,216

 
12.11
%
 
$
589,225

 
4.00
%
 
N/A

 
N/A

 
$
736,532

 
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
As of December 31, 2018
Amount
 
Ratio
 
Amount
 
Ratio
 
Amount
 
Ratio
 
Amount
 
Ratio
 
(Dollars in thousands)
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
%
 
$
573,669

 
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 1 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 1 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
%