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Securities Available-for-Sale (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2018
USD ($)
Integer
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Integer
Investments, Debt and Equity Securities [Abstract]      
Number of Investment Securities Sold | Integer 152   112
Available-for-sale Securities Pledged as Collateral $ 174,900   $ 157,800
Description of Holding Securities there were no holdings of securities of any one issuer, other than the U.S. Government and its agencies, in an amount greater than 10% of stockholders’ equity.   there were no holdings of securities of any one issuer, other than the U.S. Government and its agencies, in an amount greater than 10% of stockholders’ equity.
Loss on equity securities, net $ 121