Investment in Securities (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Allowance for Credit Loss	$ 28,000		$ 28,000		$ 17,500
Debt Securities, Available-for-sale, Purchased with Credit Deterioration, Allowance for Credit Loss at Acquisition Date					300
Available-for-sale securities Realizes Losses - Write offs	(2,000)	$ (300)	(4,500)	$ (1,500)
Catch-up premium amortization adjustment	1,600	$ (2,900)	3,100	10
Residential mortgage loans | Loans held-for-investment [Member]
Securities, Available-for-sale [Line Items]
Financing Receivable, Allowance for Credit Loss	$ 24,200		$ 24,200		$ 3,000
Realized Losses, Write offs on loans				$ (33)