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Securities, Unrealized Gains (Losses) Related to Equity Securities (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Issuer
Dec. 31, 2017
Issuer
Gains and losses on equity securities [Abstract]    
Net gains and losses recognized on equity securities $ 281  
Less: Net gains and losses recognized during the period on equity securities sold during the year 555  
Unrealized gains and losses recognized on equity securities still held (274)  
Carrying amount of equity securities without readily determinable fair values 4,000  
Impairment adjustments of equity securities without readily determinable fair values 0  
Downward adjustments of equity securities without readily determinable fair values 0  
Upward adjustments of equity securities without readily determinable fair values $ 0  
Number of issuers whose holdings exceeded 10% of consolidated stockholders' equity, excluding U.S. Government securities | Issuer 0 0