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Intangibles (Tables)
 3 Months Ended
Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Summary of Core Deposit Intangible Assets
A summary of core deposit intangible assets as of March 31, 2018 and December 31, 2017 is as follows (in thousands):

 
 
March 31, 2018
 
December 31, 2017
Gross carrying amount
 
$
11,674

 
$
11,674

Less accumulated amortization
 
(8,436
)
 
(8,159
)
Net carrying amount
 
$
3,238

 
$
3,515