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Regulatory Matters (Tables)
 3 Months Ended
Mar. 31, 2016
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, 2016
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Common equity tier 1 capital (to risk weighted assets):
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Company
$
848,429

 
11.96
%
 
$
319,220

 
4.50
%
 
$
363,556

 
5.125
%
 
N/A

 
N/A

Bank
$
882,569

 
12.45
%
 
$
319,097

 
4.50
%
 
$
363,416

 
5.125
%
 
$
460,918

 
6.50
%
Total capital (to risk-weighted assets):
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Company
$
967,615

 
13.64
%
 
$
567,502

 
8.00
%
 
$
611,838

 
8.625
%
 
N/A

 
N/A

Bank
$
960,808

 
13.55
%
 
$
567,284

 
8.00
%
 
$
611,603

 
8.625
%
 
$
709,105

 
10.00
%
Tier I capital (to risk-weighted assets):
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Company
$
889,375

 
12.54
%
 
$
425,627

 
6.00
%
 
$
469,963

 
6.625
%
 
N/A

 
N/A

Bank
$
882,569

 
12.45
%
 
$
425,463

 
6.00
%
 
$
469,782

 
6.625
%
 
$
567,284

 
8.00
%
Tier I capital (to average assets):
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Company
$
889,375

 
11.44
%
 
$
310,909

 
4.00
%
 
N/A

 
N/A

 
N/A

 
N/A

Bank
$
882,569

 
11.36
%
 
$
310,874

 
4.00
%
 
N/A

 
N/A

 
$
388,593

 
5.00
%