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Reserves on Deposit with the Federal Reserve Bank and Federal Bank Stock - Shares Held at Federal Reserve Bank and Federal Home Loan Bank (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Disclosure Shares Held At Federal Reserve Bank And Federal Home Loan Bank [Abstract]    
FHLB stock holdings $ 17,250 $ 18,900
FRB stock holdings $ 41,628 $ 41,120