Investments (Narrative) (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2022 USD ($) security	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) security	Jun. 30, 2021 USD ($)	Dec. 31, 2021 security
Schedule of Available-for-sale Securities [Line Items]
Gross gains on investments	$ 1,000,000.0	$ 3,200,000	$ 1,200,000	$ 4,700,000
Gross losses on investments	24,000	400,000	31,000	500,000
Proceeds from sale of investment securities	$ 3,900,000	$ 14,500,000	4,500,000	15,700,000
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract]
Other-than-temporary impairment			0	0
Debt Securities, Available-for-sale, Realized Gain (Loss), Excluding Other-than-temporary Impairment			$ 0	$ 0
Debt Securities [Member]
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Number of Positions [Abstract]
Number of debt securities with unrealized loss | security	201		201		100
Number of debt securities with unrealized loss, less than 12 months | security	167		167		74
Number of debt securities with unrealized loss, greater than 12 months | security	34		34		26