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Regulatory Matters (Tables)
 3 Months Ended
Mar. 31, 2017
Banking and Thrift [Abstract]  
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations
 
Actual
 
Required
For Capital
Adequacy Purposes
 
Minimum Capital Adequacy With Capital Buffer
 
Required
To Be Well
Capitalized Under
Prompt Corrective
Action Provisions
 
Amount
 
Ratio
 
Amount
 
Ratio
 
Amount
 
Ratio
 
Amount
 
Ratio
 
(Dollars in thousands)
As of March 31, 2017
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Common equity tier 1 capital
(to risk weighted assets):
 
 
 
 
 
 
 
 
 
 
 
 
Company
$
1,413,592

 
12.22
%
 
$
520,711

 
4.50
%
 
$
665,353

 
5.75
%
 
N/A

 
N/A

Bank
$
1,489,239

 
12.88
%
 
$
520,425

 
4.50
%
 
$
664,987

 
5.75
%
 
$
751,724

 
6.50
%
Total capital
(to risk-weighted assets):
 
 
 
 
 
 
 
 
 
 
 
 
Company
$
1,591,852

 
13.76
%
 
$
925,708

 
8.00
%
 
$
1,070,350

 
9.25
%
 
N/A

 
N/A

Bank
$
1,571,333

 
13.59
%
 
$
925,199

 
8.00
%
 
$
1,069,762

 
9.25
%
 
$
1,156,499

 
10.00
%
Tier I capital
(to risk-weighted assets):
 
 
 
 
 
 
 
 
 
 
 
 
Company
$
1,509,758

 
13.05
%
 
$
694,281

 
6.00
%
 
$
838,923

 
7.25
%
 
N/A

 
N/A

Bank
$
1,489,239

 
12.88
%
 
$
693,899

 
6.00
%
 
$
838,462

 
7.25
%
 
$
925,199

 
8.00
%
Tier I capital
(to average assets):
 
 
 
 
 
 
 
 
 
 
 
 
Company
$
1,509,758

 
11.72
%
 
$
515,352

 
4.00
%
 
N/A

 
N/A

 
N/A

 
N/A

Bank
$
1,489,239

 
11.56
%
 
$
515,212

 
4.00
%
 
N/A

 
N/A

 
$
644,014

 
5.00
%