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Securities, Unrealized Gains (Losses) Related to Equity Securities (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
Issuer
Sep. 30, 2018
USD ($)
Issuer
Dec. 31, 2017
Issuer
Gains and losses on equity securities [Abstract]      
Net gains and losses recognized on equity securities $ 412 $ 575  
Less: Net gains and losses recognized during the period on equity securities sold during the period 511 555  
Unrealized gains and losses recognized on equity securities still held (99) 20  
Carrying amount of equity securities without readily determinable fair values 4,000 4,000  
Impairment adjustments of equity securities without readily determinable fair values 0 0  
Downward adjustments of equity securities without readily determinable fair values 0 0  
Upward adjustments of equity securities without readily determinable fair values $ 0 $ 0  
Number of issuers whose holdings exceeded 10% of consolidated stockholders' equity, excluding U.S. Government securities | Issuer 0 0 0