Securities Available-for-Sale (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019 USD ($) Integer	Dec. 31, 2018 USD ($) Integer
Investments, Debt and Equity Securities [Abstract]
Available-for-sale Securities Pledged as Collateral | $	$ 141,900	$ 151,500
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.
Number of Investment Securities Sold | Integer	131	148