Investment Securities (Narrative) (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($) security	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) security	Jun. 30, 2019 USD ($)
Investment Securities [Abstract]
Proceeds from sale and maturity of marketable securities | $	$ 13,000,000.0	$ 0	$ 13,000,000.0	$ 0
Gain on sale of investments | $	$ 347,000		$ 347,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	3		3
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security	2		2