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Goodwill and Other Intangible Assets (Tables)
 3 Months Ended
Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible assets disclosure
The following table presents the changes in CDI and CRI and the related accumulated amortization for the periods indicated:
 
Three Months Ended
 
March 31,
 
December 31,
 
March 31,
 
2018
 
2017
 
2017
 
(In thousands)
Gross Amount of CDI and CRI:
 
 
 
 
 
Balance, beginning of period
$
119,497

 
$
61,997

 
$
64,187

Addition from CUB acquisition
—

 
57,500

 
—

Balance, end of period
119,497

 
119,497

 
64,187

Accumulated Amortization:
 
 
 
 
 
Balance, beginning of period
(39,871
)
 
(34,809
)
 
(27,821
)
Amortization
(6,346
)
 
(5,062
)
 
(3,064
)
Balance, end of period
(46,217
)
 
(39,871
)
 
(30,885
)
Net CDI and CRI, end of period
$
73,280

 
$
79,626

 
$
33,302