Investment in Securities (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Allowance for Credit Loss	$ 23,400		$ 23,400		$ 17,500
Debt Securities, Available-for-sale, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date			300		300
Available-for-sale securities Realizes Losses - Write offs			(2,500)	$ (1,300)
Catch-up premium amortization adjustment	2,100	$ 3,000	1,500	3,000
Residential mortgage loans | Loans held-for-investment [Member]
Securities, Available-for-sale [Line Items]
Financing Receivable, Allowance for Credit Loss	$ 18,700		$ 18,700		$ 3,000
Realized Losses, Write offs on loans				$ 33