Leases (Finance Lease Receivables By Risk Categories) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Recorded Investment [Line Items]
Net investment in finance leases, current year	$ 57,308	$ 135,640
Net investment in finance leases, one year before	133,978	75,712
Net investment in finance leases, two years before	70,772	241,378
Net investment in finance leases, three years before	232,435	164,469
Net investment in finance leases, four years before	160,900	7,081
Net investment in finance leases, Prior	9,977	5,331
Total net investment in finance leases	665,370	629,611
Financing receivable, current year	5,028	27,762
Financing receivable, one year before	26,439	30,679
Financing receivable, two years before	29,720
Total financing receivable	61,187	58,441
Tier 1 [Member]
Financing Receivable, Recorded Investment [Line Items]
Net investment in finance leases, current year	55,876	127,215
Net investment in finance leases, one year before	125,988	49,986
Net investment in finance leases, two years before	46,760	228,802
Net investment in finance leases, three years before	220,813	160,197
Net investment in finance leases, four years before	156,780	5,945
Net investment in finance leases, Prior	6,171	875
Total net investment in finance leases	612,388	573,020
Financing receivable, current year		27,762
Financing receivable, one year before	26,439	30,083
Financing receivable, two years before	29,159
Total financing receivable	55,598	57,845
Tier 2 [Member]
Financing Receivable, Recorded Investment [Line Items]
Net investment in finance leases, current year	1,432	8,425
Net investment in finance leases, one year before	7,990	25,726
Net investment in finance leases, two years before	24,012	12,576
Net investment in finance leases, three years before	11,622	4,272
Net investment in finance leases, four years before	4,120	1,136
Net investment in finance leases, Prior	3,806	4,456
Total net investment in finance leases	52,982	56,591
Financing receivable, current year	5,028
Financing receivable, one year before		596
Financing receivable, two years before	561
Total financing receivable	$ 5,589	$ 596