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Fair Value Measurements (Summary of Gains and Losses on Level 3 Assets and Liabilities) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Trading Activity, Gains and Losses, Net [Line Items]
Total gains or losses included in earnings	$ (6,922)	$ (820)
Change in unrealized gains or losses relating to assets still held at period end	(6,472)	(1,720)
Loans Fees And Sales [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Total gains or losses included in earnings	2,768	(77)
Change in unrealized gains or losses relating to assets still held at period end	3,226	458
Other Non-Interest Income [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Total gains or losses included in earnings	413	(16)
Change in unrealized gains or losses relating to assets still held at period end	385	(1)
Investment Securities Gains (Losses), Net [Member]
Trading Activity, Gains and Losses, Net [Line Items]
Total gains or losses included in earnings	(10,103)	(727)
Change in unrealized gains or losses relating to assets still held at period end	$ (10,083)	$ (2,177)