Fair Value Measurements (Fair Value Mortgage Loans Held For Sale Disclosures) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Mortgage loans held for sale, measured at fair value	$ 68,095		$ 68,095		$ 27,833
Mortgage loans held for sale, amortized cost	65,263		65,263		27,168
Mortgage loans held for sale, difference between fair value and amortized cost	2,832		2,832		$ 665
Mortgage Loans Held for Sale [Member]
Change in fair value under fair value option election	$ 1,100	$ (82)	$ 2,200	$ 462