Securities Available-for-Sale - Realized Gains (Losses) - Tabular Disclosure (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019		Dec. 31, 2018		Dec. 31, 2017
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]
Gross gains on sales, calls and maturities of securities available for sale	$ 230		$ 21		$ 1,024
Gross losses on sales, calls and maturities of securities available for sale	(428)		(19)		(524)
Net (losses) gains on sales and calls of securities	$ (198)	[1]	$ 2	[1]	$ 500

[1] Not within the scope of ASC 606. Revenue streams are not related to contracts with customers and are accounted for on an accrual basis under other provisions of GAAP.