Investment Securities (Narrative) (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($) security	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) security	Sep. 30, 2020 USD ($)
Proceeds from sale and maturity of marketable securities | $	$ 0	$ 0	$ 0	$ 13,000
Gain on sale of investments | $				$ 347
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	19		19
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security	46		46