Investment Securities (Narrative) (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021 USD ($) security	Jun. 30, 2020 USD ($)	Jun. 30, 2021 USD ($) security	Jun. 30, 2020 USD ($)
Proceeds from sale and maturity of marketable securities | $	$ 0	$ 13,000	$ 0	$ 13,000
Gain on sale of investments | $		$ 347		$ 347
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | security	18		18
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security	24		24